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/wp-includes/ -> formatting.php (source)

   1  <?php
   2  /**
   3   * Main WordPress Formatting API.
   4   *
   5   * Handles many functions for formatting output.
   6   *
   7   * @package WordPress
   8   */
   9  
  10  /**
  11   * Replaces common plain text characters with formatted entities.
  12   *
  13   * Returns given text with transformations of quotes into smart quotes, apostrophes,
  14   * dashes, ellipses, the trademark symbol, and the multiplication symbol.
  15   *
  16   * As an example,
  17   *
  18   *     'cause today's effort makes it worth tomorrow's "holiday" ...
  19   *
  20   * Becomes:
  21   *
  22   *     &#8217;cause today&#8217;s effort makes it worth tomorrow&#8217;s &#8220;holiday&#8221; &#8230;
  23   *
  24   * Code within certain HTML blocks are skipped.
  25   *
  26   * Do not use this function before the {@see 'init'} action hook; everything will break.
  27   *
  28   * @since 0.71
  29   *
  30   * @global array $wp_cockneyreplace Array of formatted entities for certain common phrases.
  31   * @global array $shortcode_tags
  32   *
  33   * @param string $text  The text to be formatted.
  34   * @param bool   $reset Set to true for unit testing. Translated patterns will reset.
  35   * @return string The string replaced with HTML entities.
  36   */
  37  function wptexturize( $text, $reset = false ) {
  38      global $wp_cockneyreplace, $shortcode_tags;
  39      static $static_characters            = null,
  40          $static_replacements             = null,
  41          $dynamic_characters              = null,
  42          $dynamic_replacements            = null,
  43          $default_no_texturize_tags       = null,
  44          $default_no_texturize_shortcodes = null,
  45          $run_texturize                   = true,
  46          $apos                            = null,
  47          $prime                           = null,
  48          $double_prime                    = null,
  49          $opening_quote                   = null,
  50          $closing_quote                   = null,
  51          $opening_single_quote            = null,
  52          $closing_single_quote            = null,
  53          $open_q_flag                     = '<!--oq-->',
  54          $open_sq_flag                    = '<!--osq-->',
  55          $apos_flag                       = '<!--apos-->';
  56  
  57      // If there's nothing to do, just stop.
  58      if ( empty( $text ) || false === $run_texturize ) {
  59          return $text;
  60      }
  61  
  62      // Set up static variables. Run once only.
  63      if ( $reset || ! isset( $static_characters ) ) {
  64          /**
  65           * Filters whether to skip running wptexturize().
  66           *
  67           * Returning false from the filter will effectively short-circuit wptexturize()
  68           * and return the original text passed to the function instead.
  69           *
  70           * The filter runs only once, the first time wptexturize() is called.
  71           *
  72           * @since 4.0.0
  73           *
  74           * @see wptexturize()
  75           *
  76           * @param bool $run_texturize Whether to short-circuit wptexturize().
  77           */
  78          $run_texturize = apply_filters( 'run_wptexturize', $run_texturize );
  79          if ( false === $run_texturize ) {
  80              return $text;
  81          }
  82  
  83          /* translators: Opening curly double quote. */
  84          $opening_quote = _x( '&#8220;', 'opening curly double quote' );
  85          /* translators: Closing curly double quote. */
  86          $closing_quote = _x( '&#8221;', 'closing curly double quote' );
  87  
  88          /* translators: Apostrophe, for example in 'cause or can't. */
  89          $apos = _x( '&#8217;', 'apostrophe' );
  90  
  91          /* translators: Prime, for example in 9' (nine feet). */
  92          $prime = _x( '&#8242;', 'prime' );
  93          /* translators: Double prime, for example in 9" (nine inches). */
  94          $double_prime = _x( '&#8243;', 'double prime' );
  95  
  96          /* translators: Opening curly single quote. */
  97          $opening_single_quote = _x( '&#8216;', 'opening curly single quote' );
  98          /* translators: Closing curly single quote. */
  99          $closing_single_quote = _x( '&#8217;', 'closing curly single quote' );
 100  
 101          /* translators: En dash. */
 102          $en_dash = _x( '&#8211;', 'en dash' );
 103          /* translators: Em dash. */
 104          $em_dash = _x( '&#8212;', 'em dash' );
 105  
 106          $default_no_texturize_tags       = array( 'pre', 'code', 'kbd', 'style', 'script', 'tt' );
 107          $default_no_texturize_shortcodes = array( 'code' );
 108  
 109          // If a plugin has provided an autocorrect array, use it.
 110          if ( isset( $wp_cockneyreplace ) ) {
 111              $cockney        = array_keys( $wp_cockneyreplace );
 112              $cockneyreplace = array_values( $wp_cockneyreplace );
 113          } else {
 114              /*
 115               * translators: This is a comma-separated list of words that defy the syntax of quotations in normal use,
 116               * for example... 'We do not have enough words yet'... is a typical quoted phrase. But when we write
 117               * lines of code 'til we have enough of 'em, then we need to insert apostrophes instead of quotes.
 118               */
 119              $cockney = explode(
 120                  ',',
 121                  _x(
 122                      "'tain't,'twere,'twas,'tis,'twill,'til,'bout,'nuff,'round,'cause,'em",
 123                      'Comma-separated list of words to texturize in your language'
 124                  )
 125              );
 126  
 127              $cockneyreplace = explode(
 128                  ',',
 129                  _x(
 130                      '&#8217;tain&#8217;t,&#8217;twere,&#8217;twas,&#8217;tis,&#8217;twill,&#8217;til,&#8217;bout,&#8217;nuff,&#8217;round,&#8217;cause,&#8217;em',
 131                      'Comma-separated list of replacement words in your language'
 132                  )
 133              );
 134          }
 135  
 136          $static_characters   = array_merge( array( '...', '``', '\'\'', ' (tm)' ), $cockney );
 137          $static_replacements = array_merge( array( '&#8230;', $opening_quote, $closing_quote, ' &#8482;' ), $cockneyreplace );
 138  
 139          /*
 140           * Pattern-based replacements of characters.
 141           * Sort the remaining patterns into several arrays for performance tuning.
 142           */
 143          $dynamic_characters   = array(
 144              'apos'  => array(),
 145              'quote' => array(),
 146              'dash'  => array(),
 147          );
 148          $dynamic_replacements = array(
 149              'apos'  => array(),
 150              'quote' => array(),
 151              'dash'  => array(),
 152          );
 153          $dynamic              = array();
 154          $spaces               = wp_spaces_regexp();
 155  
 156          // '99' and '99" are ambiguous among other patterns; assume it's an abbreviated year at the end of a quotation.
 157          if ( "'" !== $apos || "'" !== $closing_single_quote ) {
 158              $dynamic[ '/\'(\d\d)\'(?=\Z|[.,:;!?)}\-\]]|&gt;|' . $spaces . ')/' ] = $apos_flag . '$1' . $closing_single_quote;
 159          }
 160          if ( "'" !== $apos || '"' !== $closing_quote ) {
 161              $dynamic[ '/\'(\d\d)"(?=\Z|[.,:;!?)}\-\]]|&gt;|' . $spaces . ')/' ] = $apos_flag . '$1' . $closing_quote;
 162          }
 163  
 164          // '99 '99s '99's (apostrophe)  But never '9 or '99% or '999 or '99.0.
 165          if ( "'" !== $apos ) {
 166              $dynamic['/\'(?=\d\d(?:\Z|(?![%\d]|[.,]\d)))/'] = $apos_flag;
 167          }
 168  
 169          // Quoted numbers like '0.42'.
 170          if ( "'" !== $opening_single_quote && "'" !== $closing_single_quote ) {
 171              $dynamic[ '/(?<=\A|' . $spaces . ')\'(\d[.,\d]*)\'/' ] = $open_sq_flag . '$1' . $closing_single_quote;
 172          }
 173  
 174          // Single quote at start, or preceded by (, {, <, [, ", -, or spaces.
 175          if ( "'" !== $opening_single_quote ) {
 176              $dynamic[ '/(?<=\A|[([{"\-]|&lt;|' . $spaces . ')\'/' ] = $open_sq_flag;
 177          }
 178  
 179          // Apostrophe in a word. No spaces, double apostrophes, or other punctuation.
 180          if ( "'" !== $apos ) {
 181              $dynamic[ '/(?<!' . $spaces . ')\'(?!\Z|[.,:;!?"\'(){}[\]\-]|&[lg]t;|' . $spaces . ')/' ] = $apos_flag;
 182          }
 183  
 184          $dynamic_characters['apos']   = array_keys( $dynamic );
 185          $dynamic_replacements['apos'] = array_values( $dynamic );
 186          $dynamic                      = array();
 187  
 188          // Quoted numbers like "42".
 189          if ( '"' !== $opening_quote && '"' !== $closing_quote ) {
 190              $dynamic[ '/(?<=\A|' . $spaces . ')"(\d[.,\d]*)"/' ] = $open_q_flag . '$1' . $closing_quote;
 191          }
 192  
 193          // Double quote at start, or preceded by (, {, <, [, -, or spaces, and not followed by spaces.
 194          if ( '"' !== $opening_quote ) {
 195              $dynamic[ '/(?<=\A|[([{\-]|&lt;|' . $spaces . ')"(?!' . $spaces . ')/' ] = $open_q_flag;
 196          }
 197  
 198          $dynamic_characters['quote']   = array_keys( $dynamic );
 199          $dynamic_replacements['quote'] = array_values( $dynamic );
 200          $dynamic                       = array();
 201  
 202          // Dashes and spaces.
 203          $dynamic['/---/'] = $em_dash;
 204          $dynamic[ '/(?<=^|' . $spaces . ')--(?=$|' . $spaces . ')/' ] = $em_dash;
 205          $dynamic['/(?<!xn)--/']                                       = $en_dash;
 206          $dynamic[ '/(?<=^|' . $spaces . ')-(?=$|' . $spaces . ')/' ]  = $en_dash;
 207  
 208          $dynamic_characters['dash']   = array_keys( $dynamic );
 209          $dynamic_replacements['dash'] = array_values( $dynamic );
 210      }
 211  
 212      // Must do this every time in case plugins use these filters in a context sensitive manner.
 213      /**
 214       * Filters the list of HTML elements not to texturize.
 215       *
 216       * @since 2.8.0
 217       *
 218       * @param string[] $default_no_texturize_tags An array of HTML element names.
 219       */
 220      $no_texturize_tags = apply_filters( 'no_texturize_tags', $default_no_texturize_tags );
 221      /**
 222       * Filters the list of shortcodes not to texturize.
 223       *
 224       * @since 2.8.0
 225       *
 226       * @param string[] $default_no_texturize_shortcodes An array of shortcode names.
 227       */
 228      $no_texturize_shortcodes = apply_filters( 'no_texturize_shortcodes', $default_no_texturize_shortcodes );
 229  
 230      $no_texturize_tags_stack       = array();
 231      $no_texturize_shortcodes_stack = array();
 232  
 233      // Look for shortcodes and HTML elements.
 234  
 235      preg_match_all( '@\[/?([^<>&/\[\]\x00-\x20=]++)@', $text, $matches );
 236      $tagnames         = array_intersect( array_keys( $shortcode_tags ), $matches[1] );
 237      $found_shortcodes = ! empty( $tagnames );
 238      $shortcode_regex  = $found_shortcodes ? _get_wptexturize_shortcode_regex( $tagnames ) : '';
 239      $regex            = _get_wptexturize_split_regex( $shortcode_regex );
 240  
 241      $textarr = preg_split( $regex, $text, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY );
 242  
 243      foreach ( $textarr as &$curl ) {
 244          // Only call _wptexturize_pushpop_element if $curl is a delimiter.
 245          $first = $curl[0];
 246          if ( '<' === $first ) {
 247              if ( str_starts_with( $curl, '<!--' ) ) {
 248                  // This is an HTML comment delimiter.
 249                  continue;
 250              } else {
 251                  // This is an HTML element delimiter.
 252  
 253                  // Replace each & with &#038; unless it already looks like an entity.
 254                  $curl = preg_replace( '/&(?!#(?:\d+|x[a-f0-9]+);|[a-z1-4]{1,8};)/i', '&#038;', $curl );
 255  
 256                  _wptexturize_pushpop_element( $curl, $no_texturize_tags_stack, $no_texturize_tags );
 257              }
 258          } elseif ( '' === trim( $curl ) ) {
 259              // This is a newline between delimiters. Performance improves when we check this.
 260              continue;
 261  
 262          } elseif ( '[' === $first && $found_shortcodes && 1 === preg_match( '/^' . $shortcode_regex . '$/', $curl ) ) {
 263              // This is a shortcode delimiter.
 264  
 265              if ( ! str_starts_with( $curl, '[[' ) && ! str_ends_with( $curl, ']]' ) ) {
 266                  // Looks like a normal shortcode.
 267                  _wptexturize_pushpop_element( $curl, $no_texturize_shortcodes_stack, $no_texturize_shortcodes );
 268              } else {
 269                  // Looks like an escaped shortcode.
 270                  continue;
 271              }
 272          } elseif ( empty( $no_texturize_shortcodes_stack ) && empty( $no_texturize_tags_stack ) ) {
 273              // This is neither a delimiter, nor is this content inside of no_texturize pairs. Do texturize.
 274  
 275              $curl = str_replace( $static_characters, $static_replacements, $curl );
 276  
 277              if ( str_contains( $curl, "'" ) ) {
 278                  $curl = preg_replace( $dynamic_characters['apos'], $dynamic_replacements['apos'], $curl );
 279                  $curl = wptexturize_primes( $curl, "'", $prime, $open_sq_flag, $closing_single_quote );
 280                  $curl = str_replace( $apos_flag, $apos, $curl );
 281                  $curl = str_replace( $open_sq_flag, $opening_single_quote, $curl );
 282              }
 283              if ( str_contains( $curl, '"' ) ) {
 284                  $curl = preg_replace( $dynamic_characters['quote'], $dynamic_replacements['quote'], $curl );
 285                  $curl = wptexturize_primes( $curl, '"', $double_prime, $open_q_flag, $closing_quote );
 286                  $curl = str_replace( $open_q_flag, $opening_quote, $curl );
 287              }
 288              if ( str_contains( $curl, '-' ) ) {
 289                  $curl = preg_replace( $dynamic_characters['dash'], $dynamic_replacements['dash'], $curl );
 290              }
 291  
 292              // 9x9 (times), but never 0x9999.
 293              if ( 1 === preg_match( '/(?<=\d)x\d/', $curl ) ) {
 294                  // Searching for a digit is 10 times more expensive than for the x, so we avoid doing this one!
 295                  $curl = preg_replace( '/\b(\d(?(?<=0)[\d\.,]+|[\d\.,]*))x(\d[\d\.,]*)\b/', '$1&#215;$2', $curl );
 296              }
 297  
 298              // Replace each & with &#038; unless it already looks like an entity.
 299              $curl = preg_replace( '/&(?!#(?:\d+|x[a-f0-9]+);|[a-z1-4]{1,8};)/i', '&#038;', $curl );
 300          }
 301      }
 302  
 303      return implode( '', $textarr );
 304  }
 305  
 306  /**
 307   * Implements a logic tree to determine whether or not "7'." represents seven feet,
 308   * then converts the special char into either a prime char or a closing quote char.
 309   *
 310   * @since 4.3.0
 311   *
 312   * @param string $haystack    The plain text to be searched.
 313   * @param string $needle      The character to search for such as ' or ".
 314   * @param string $prime       The prime char to use for replacement.
 315   * @param string $open_quote  The opening quote char. Opening quote replacement must be
 316   *                            accomplished already.
 317   * @param string $close_quote The closing quote char to use for replacement.
 318   * @return string The $haystack value after primes and quotes replacements.
 319   */
 320  function wptexturize_primes( $haystack, $needle, $prime, $open_quote, $close_quote ) {
 321      $spaces           = wp_spaces_regexp();
 322      $flag             = '<!--wp-prime-or-quote-->';
 323      $quote_pattern    = "/$needle(?=\\Z|[.,:;!?)}\\-\\]]|&gt;|" . $spaces . ')/';
 324      $prime_pattern    = "/(?<=\\d)$needle/";
 325      $flag_after_digit = "/(?<=\\d)$flag/";
 326      $flag_no_digit    = "/(?<!\\d)$flag/";
 327  
 328      $sentences = explode( $open_quote, $haystack );
 329  
 330      foreach ( $sentences as $key => &$sentence ) {
 331          if ( ! str_contains( $sentence, $needle ) ) {
 332              continue;
 333          } elseif ( 0 !== $key && 0 === substr_count( $sentence, $close_quote ) ) {
 334              $sentence = preg_replace( $quote_pattern, $flag, $sentence, -1, $count );
 335              if ( $count > 1 ) {
 336                  // This sentence appears to have multiple closing quotes. Attempt Vulcan logic.
 337                  $sentence = preg_replace( $flag_no_digit, $close_quote, $sentence, -1, $count2 );
 338                  if ( 0 === $count2 ) {
 339                      // Try looking for a quote followed by a period.
 340                      $count2 = substr_count( $sentence, "$flag." );
 341                      if ( $count2 > 0 ) {
 342                          // Assume the rightmost quote-period match is the end of quotation.
 343                          $pos = strrpos( $sentence, "$flag." );
 344                      } else {
 345                          /*
 346                           * When all else fails, make the rightmost candidate a closing quote.
 347                           * This is most likely to be problematic in the context of bug #18549.
 348                           */
 349                          $pos = strrpos( $sentence, $flag );
 350                      }
 351                      $sentence = substr_replace( $sentence, $close_quote, $pos, strlen( $flag ) );
 352                  }
 353                  // Use conventional replacement on any remaining primes and quotes.
 354                  $sentence = preg_replace( $prime_pattern, $prime, $sentence );
 355                  $sentence = preg_replace( $flag_after_digit, $prime, $sentence );
 356                  $sentence = str_replace( $flag, $close_quote, $sentence );
 357              } elseif ( 1 === $count ) {
 358                  // Found only one closing quote candidate, so give it priority over primes.
 359                  $sentence = str_replace( $flag, $close_quote, $sentence );
 360                  $sentence = preg_replace( $prime_pattern, $prime, $sentence );
 361              } else {
 362                  // No closing quotes found. Just run primes pattern.
 363                  $sentence = preg_replace( $prime_pattern, $prime, $sentence );
 364              }
 365          } else {
 366              $sentence = preg_replace( $prime_pattern, $prime, $sentence );
 367              $sentence = preg_replace( $quote_pattern, $close_quote, $sentence );
 368          }
 369          if ( '"' === $needle && str_contains( $sentence, '"' ) ) {
 370              $sentence = str_replace( '"', $close_quote, $sentence );
 371          }
 372      }
 373  
 374      return implode( $open_quote, $sentences );
 375  }
 376  
 377  /**
 378   * Searches for disabled element tags. Pushes element to stack on tag open
 379   * and pops on tag close.
 380   *
 381   * Assumes first char of `$text` is tag opening and last char is tag closing.
 382   * Assumes second char of `$text` is optionally `/` to indicate closing as in `</html>`.
 383   *
 384   * @since 2.9.0
 385   * @access private
 386   *
 387   * @param string   $text              Text to check. Must be a tag like `<html>` or `[shortcode]`.
 388   * @param string[] $stack             Array of open tag elements.
 389   * @param string[] $disabled_elements Array of tag names to match against. Spaces are not allowed in tag names.
 390   */
 391  function _wptexturize_pushpop_element( $text, &$stack, $disabled_elements ) {
 392      // Is it an opening tag or closing tag?
 393      if ( isset( $text[1] ) && '/' !== $text[1] ) {
 394          $opening_tag = true;
 395          $name_offset = 1;
 396      } elseif ( 0 === count( $stack ) ) {
 397          // Stack is empty. Just stop.
 398          return;
 399      } else {
 400          $opening_tag = false;
 401          $name_offset = 2;
 402      }
 403  
 404      // Parse out the tag name.
 405      $space = strpos( $text, ' ' );
 406      if ( false === $space ) {
 407          $space = -1;
 408      } else {
 409          $space -= $name_offset;
 410      }
 411      $tag = substr( $text, $name_offset, $space );
 412  
 413      // Handle disabled tags.
 414      if ( in_array( $tag, $disabled_elements, true ) ) {
 415          if ( $opening_tag ) {
 416              /*
 417               * This disables texturize until we find a closing tag of our type
 418               * (e.g. <pre>) even if there was invalid nesting before that.
 419               *
 420               * Example: in the case <pre>sadsadasd</code>"baba"</pre>
 421               *          "baba" won't be texturized.
 422               */
 423  
 424              array_push( $stack, $tag );
 425          } elseif ( end( $stack ) === $tag ) {
 426              array_pop( $stack );
 427          }
 428      }
 429  }
 430  
 431  /**
 432   * Replaces double line breaks with paragraph elements.
 433   *
 434   * A group of regex replaces used to identify text formatted with newlines and
 435   * replace double line breaks with HTML paragraph tags. The remaining line breaks
 436   * after conversion become `<br />` tags, unless `$br` is set to '0' or 'false'.
 437   *
 438   * @since 0.71
 439   *
 440   * @param string $text The text which has to be formatted.
 441   * @param bool   $br   Optional. If set, this will convert all remaining line breaks
 442   *                     after paragraphing. Line breaks within `<script>`, `<style>`,
 443   *                     and `<svg>` tags are not affected. Default true.
 444   * @return string Text which has been converted into correct paragraph tags.
 445   */
 446  function wpautop( $text, $br = true ) {
 447      $pre_tags = array();
 448  
 449      if ( trim( $text ) === '' ) {
 450          return '';
 451      }
 452  
 453      // Just to make things a little easier, pad the end.
 454      $text = $text . "\n";
 455  
 456      /*
 457       * Pre tags shouldn't be touched by autop.
 458       * Replace pre tags with placeholders and bring them back after autop.
 459       */
 460      if ( str_contains( $text, '<pre' ) ) {
 461          $text_parts = explode( '</pre>', $text );
 462          $last_part  = array_pop( $text_parts );
 463          $text       = '';
 464          $i          = 0;
 465  
 466          foreach ( $text_parts as $text_part ) {
 467              $start = strpos( $text_part, '<pre' );
 468  
 469              // Malformed HTML?
 470              if ( false === $start ) {
 471                  $text .= $text_part;
 472                  continue;
 473              }
 474  
 475              $name              = "<pre wp-pre-tag-$i></pre>";
 476              $pre_tags[ $name ] = substr( $text_part, $start ) . '</pre>';
 477  
 478              $text .= substr( $text_part, 0, $start ) . $name;
 479              ++$i;
 480          }
 481  
 482          $text .= $last_part;
 483      }
 484      // Change multiple <br>'s into two line breaks, which will turn into paragraphs.
 485      $text = preg_replace( '|<br\s*/?>\s*<br\s*/?>|', "\n\n", $text );
 486  
 487      $allblocks = '(?:table|thead|tfoot|caption|col|colgroup|tbody|tr|td|th|div|dl|dd|dt|ul|ol|li|pre|form|map|area|blockquote|address|style|p|h[1-6]|hr|fieldset|legend|section|article|aside|hgroup|header|footer|nav|figure|figcaption|details|menu|summary)';
 488  
 489      // Add a double line break above block-level opening tags.
 490      $text = preg_replace( '!(<' . $allblocks . '[\s/>])!', "\n\n$1", $text );
 491  
 492      // Add a double line break below block-level closing tags.
 493      $text = preg_replace( '!(</' . $allblocks . '>)!', "$1\n\n", $text );
 494  
 495      // Add a double line break after hr tags, which are self closing.
 496      $text = preg_replace( '!(<hr\s*?/?>)!', "$1\n\n", $text );
 497  
 498      // Standardize newline characters to "\n".
 499      $text = str_replace( array( "\r\n", "\r" ), "\n", $text );
 500  
 501      // Find newlines in all elements and add placeholders.
 502      $text = wp_replace_in_html_tags( $text, array( "\n" => ' <!-- wpnl --> ' ) );
 503  
 504      // Collapse line breaks before and after <option> elements so they don't get autop'd.
 505      if ( str_contains( $text, '<option' ) ) {
 506          $text = preg_replace( '|\s*<option|', '<option', $text );
 507          $text = preg_replace( '|</option>\s*|', '</option>', $text );
 508      }
 509  
 510      /*
 511       * Collapse line breaks inside <object> elements, before <param> and <embed> elements
 512       * so they don't get autop'd.
 513       */
 514      if ( str_contains( $text, '</object>' ) ) {
 515          $text = preg_replace( '|(<object[^>]*>)\s*|', '$1', $text );
 516          $text = preg_replace( '|\s*</object>|', '</object>', $text );
 517          $text = preg_replace( '%\s*(</?(?:param|embed)[^>]*>)\s*%', '$1', $text );
 518      }
 519  
 520      /*
 521       * Collapse line breaks inside <audio> and <video> elements,
 522       * before and after <source> and <track> elements.
 523       */
 524      if ( str_contains( $text, '<source' ) || str_contains( $text, '<track' ) ) {
 525          $text = preg_replace( '%([<\[](?:audio|video)[^>\]]*[>\]])\s*%', '$1', $text );
 526          $text = preg_replace( '%\s*([<\[]/(?:audio|video)[>\]])%', '$1', $text );
 527          $text = preg_replace( '%\s*(<(?:source|track)[^>]*>)\s*%', '$1', $text );
 528      }
 529  
 530      // Collapse line breaks before and after <figcaption> elements.
 531      if ( str_contains( $text, '<figcaption' ) ) {
 532          $text = preg_replace( '|\s*(<figcaption[^>]*>)|', '$1', $text );
 533          $text = preg_replace( '|</figcaption>\s*|', '</figcaption>', $text );
 534      }
 535  
 536      // Remove more than two contiguous line breaks.
 537      $text = preg_replace( "/\n\n+/", "\n\n", $text );
 538  
 539      // Split up the contents into an array of strings, separated by double line breaks.
 540      $paragraphs = preg_split( '/\n\s*\n/', $text, -1, PREG_SPLIT_NO_EMPTY );
 541  
 542      // Reset $text prior to rebuilding.
 543      $text = '';
 544  
 545      // Rebuild the content as a string, wrapping every bit with a <p>.
 546      foreach ( $paragraphs as $paragraph ) {
 547          $text .= '<p>' . trim( $paragraph, "\n" ) . "</p>\n";
 548      }
 549  
 550      // Under certain strange conditions it could create a P of entirely whitespace.
 551      $text = preg_replace( '|<p>\s*</p>|', '', $text );
 552  
 553      // Add a closing <p> inside <div>, <address>, or <form> tag if missing.
 554      $text = preg_replace( '!<p>([^<]+)</(div|address|form)>!', '<p>$1</p></$2>', $text );
 555  
 556      // If an opening or closing block element tag is wrapped in a <p>, unwrap it.
 557      $text = preg_replace( '!<p>\s*(</?' . $allblocks . '[^>]*>)\s*</p>!', '$1', $text );
 558  
 559      // In some cases <li> may get wrapped in <p>, fix them.
 560      $text = preg_replace( '|<p>(<li.+?)</p>|', '$1', $text );
 561  
 562      // If a <blockquote> is wrapped with a <p>, move it inside the <blockquote>.
 563      $text = preg_replace( '|<p><blockquote([^>]*)>|i', '<blockquote$1><p>', $text );
 564      $text = str_replace( '</blockquote></p>', '</p></blockquote>', $text );
 565  
 566      // If an opening or closing block element tag is preceded by an opening <p> tag, remove it.
 567      $text = preg_replace( '!<p>\s*(</?' . $allblocks . '[^>]*>)!', '$1', $text );
 568  
 569      // If an opening or closing block element tag is followed by a closing <p> tag, remove it.
 570      $text = preg_replace( '!(</?' . $allblocks . '[^>]*>)\s*</p>!', '$1', $text );
 571  
 572      // Optionally insert line breaks.
 573      if ( $br ) {
 574          // Replace newlines that shouldn't be touched with a placeholder.
 575          $text = preg_replace_callback( '/<(script|style|svg|math).*?<\/\\1>/s', '_autop_newline_preservation_helper', $text );
 576  
 577          // Normalize <br>.
 578          $text = str_replace( array( '<br>', '<br/>' ), '<br />', $text );
 579  
 580          // Replace any new line characters that aren't preceded by a <br /> with a <br />.
 581          $text = preg_replace( '|(?<!<br />)\s*\n|', "<br />\n", $text );
 582  
 583          // Replace newline placeholders with newlines.
 584          $text = str_replace( '<WPPreserveNewline />', "\n", $text );
 585      }
 586  
 587      // If a <br /> tag is after an opening or closing block tag, remove it.
 588      $text = preg_replace( '!(</?' . $allblocks . '[^>]*>)\s*<br />!', '$1', $text );
 589  
 590      // If a <br /> tag is before a subset of opening or closing block tags, remove it.
 591      $text = preg_replace( '!<br />(\s*</?(?:p|li|div|dl|dd|dt|th|pre|td|ul|ol)[^>]*>)!', '$1', $text );
 592      $text = preg_replace( "|\n</p>$|", '</p>', $text );
 593  
 594      // Replace placeholder <pre> tags with their original content.
 595      if ( ! empty( $pre_tags ) ) {
 596          $text = str_replace( array_keys( $pre_tags ), array_values( $pre_tags ), $text );
 597      }
 598  
 599      // Restore newlines in all elements.
 600      if ( str_contains( $text, '<!-- wpnl -->' ) ) {
 601          $text = str_replace( array( ' <!-- wpnl --> ', '<!-- wpnl -->' ), "\n", $text );
 602      }
 603  
 604      return $text;
 605  }
 606  
 607  /**
 608   * Separates HTML elements and comments from the text.
 609   *
 610   * @since 4.2.4
 611   *
 612   * @param string $input The text which has to be formatted.
 613   * @return string[] Array of the formatted text.
 614   */
 615  function wp_html_split( $input ) {
 616      return preg_split( get_html_split_regex(), $input, -1, PREG_SPLIT_DELIM_CAPTURE );
 617  }
 618  
 619  /**
 620   * Retrieves the regular expression for an HTML element.
 621   *
 622   * @since 4.4.0
 623   *
 624   * @return string The regular expression.
 625   */
 626  function get_html_split_regex() {
 627      static $regex;
 628  
 629      if ( ! isset( $regex ) ) {
 630          // phpcs:disable Squiz.Strings.ConcatenationSpacing.PaddingFound -- don't remove regex indentation
 631          $comments =
 632              '!'             // Start of comment, after the <.
 633              . '(?:'         // Unroll the loop: Consume everything until --> is found.
 634              .     '-(?!->)' // Dash not followed by end of comment.
 635              .     '[^\-]*+' // Consume non-dashes.
 636              . ')*+'         // Loop possessively.
 637              . '(?:-->)?';   // End of comment. If not found, match all input.
 638  
 639          $cdata =
 640              '!\[CDATA\['    // Start of comment, after the <.
 641              . '[^\]]*+'     // Consume non-].
 642              . '(?:'         // Unroll the loop: Consume everything until ]]> is found.
 643              .     '](?!]>)' // One ] not followed by end of comment.
 644              .     '[^\]]*+' // Consume non-].
 645              . ')*+'         // Loop possessively.
 646              . '(?:]]>)?';   // End of comment. If not found, match all input.
 647  
 648          $escaped =
 649              '(?='             // Is the element escaped?
 650              .    '!--'
 651              . '|'
 652              .    '!\[CDATA\['
 653              . ')'
 654              . '(?(?=!-)'      // If yes, which type?
 655              .     $comments
 656              . '|'
 657              .     $cdata
 658              . ')';
 659  
 660          $regex =
 661              '/('                // Capture the entire match.
 662              .     '<'           // Find start of element.
 663              .     '(?'          // Conditional expression follows.
 664              .         $escaped  // Find end of escaped element.
 665              .     '|'           // ...else...
 666              .         '[^>]*>?' // Find end of normal element.
 667              .     ')'
 668              . ')/';
 669          // phpcs:enable
 670      }
 671  
 672      return $regex;
 673  }
 674  
 675  /**
 676   * Retrieves the combined regular expression for HTML and shortcodes.
 677   *
 678   * @access private
 679   * @ignore
 680   * @internal This function will be removed in 4.5.0 per Shortcode API Roadmap.
 681   * @since 4.4.0
 682   *
 683   * @param string $shortcode_regex Optional. The result from _get_wptexturize_shortcode_regex().
 684   * @return string The regular expression.
 685   */
 686  function _get_wptexturize_split_regex( $shortcode_regex = '' ) {
 687      static $html_regex;
 688  
 689      if ( ! isset( $html_regex ) ) {
 690          // phpcs:disable Squiz.Strings.ConcatenationSpacing.PaddingFound -- don't remove regex indentation
 691          $comment_regex =
 692              '!'             // Start of comment, after the <.
 693              . '(?:'         // Unroll the loop: Consume everything until --> is found.
 694              .     '-(?!->)' // Dash not followed by end of comment.
 695              .     '[^\-]*+' // Consume non-dashes.
 696              . ')*+'         // Loop possessively.
 697              . '(?:-->)?';   // End of comment. If not found, match all input.
 698  
 699          $html_regex = // Needs replaced with wp_html_split() per Shortcode API Roadmap.
 700              '<'                  // Find start of element.
 701              . '(?(?=!--)'        // Is this a comment?
 702              .     $comment_regex // Find end of comment.
 703              . '|'
 704              .     '[^>]*>?'      // Find end of element. If not found, match all input.
 705              . ')';
 706          // phpcs:enable
 707      }
 708  
 709      if ( empty( $shortcode_regex ) ) {
 710          $regex = '/(' . $html_regex . ')/';
 711      } else {
 712          $regex = '/(' . $html_regex . '|' . $shortcode_regex . ')/';
 713      }
 714  
 715      return $regex;
 716  }
 717  
 718  /**
 719   * Retrieves the regular expression for shortcodes.
 720   *
 721   * @access private
 722   * @ignore
 723   * @since 4.4.0
 724   *
 725   * @param string[] $tagnames Array of shortcodes to find.
 726   * @return string The regular expression.
 727   */
 728  function _get_wptexturize_shortcode_regex( $tagnames ) {
 729      $tagregexp = implode( '|', array_map( 'preg_quote', $tagnames ) );
 730      $tagregexp = "(?:$tagregexp)(?=[\\s\\]\\/])"; // Excerpt of get_shortcode_regex().
 731      // phpcs:disable Squiz.Strings.ConcatenationSpacing.PaddingFound -- don't remove regex indentation
 732      $regex =
 733          '\['                // Find start of shortcode.
 734          . '[\/\[]?'         // Shortcodes may begin with [/ or [[.
 735          . $tagregexp        // Only match registered shortcodes, because performance.
 736          . '(?:'
 737          .     '[^\[\]<>]+'  // Shortcodes do not contain other shortcodes. Quantifier critical.
 738          . '|'
 739          .     '<[^\[\]>]*>' // HTML elements permitted. Prevents matching ] before >.
 740          . ')*+'             // Possessive critical.
 741          . '\]'              // Find end of shortcode.
 742          . '\]?';            // Shortcodes may end with ]].
 743      // phpcs:enable
 744  
 745      return $regex;
 746  }
 747  
 748  /**
 749   * Replaces characters or phrases within HTML elements only.
 750   *
 751   * @since 4.2.3
 752   *
 753   * @param string $haystack      The text which has to be formatted.
 754   * @param array  $replace_pairs In the form array('from' => 'to', ...).
 755   * @return string The formatted text.
 756   */
 757  function wp_replace_in_html_tags( $haystack, $replace_pairs ) {
 758      // Find all elements.
 759      $textarr = wp_html_split( $haystack );
 760      $changed = false;
 761  
 762      // Optimize when searching for one item.
 763      if ( 1 === count( $replace_pairs ) ) {
 764          // Extract $needle and $replace.
 765          $needle  = array_key_first( $replace_pairs );
 766          $replace = $replace_pairs[ $needle ];
 767  
 768          // Loop through delimiters (elements) only.
 769          for ( $i = 1, $c = count( $textarr ); $i < $c; $i += 2 ) {
 770              if ( str_contains( $textarr[ $i ], $needle ) ) {
 771                  $textarr[ $i ] = str_replace( $needle, $replace, $textarr[ $i ] );
 772                  $changed       = true;
 773              }
 774          }
 775      } else {
 776          // Extract all $needles.
 777          $needles = array_keys( $replace_pairs );
 778  
 779          // Loop through delimiters (elements) only.
 780          for ( $i = 1, $c = count( $textarr ); $i < $c; $i += 2 ) {
 781              foreach ( $needles as $needle ) {
 782                  if ( str_contains( $textarr[ $i ], $needle ) ) {
 783                      $textarr[ $i ] = strtr( $textarr[ $i ], $replace_pairs );
 784                      $changed       = true;
 785                      // After one strtr() break out of the foreach loop and look at next element.
 786                      break;
 787                  }
 788              }
 789          }
 790      }
 791  
 792      if ( $changed ) {
 793          $haystack = implode( $textarr );
 794      }
 795  
 796      return $haystack;
 797  }
 798  
 799  /**
 800   * Newline preservation help function for wpautop().
 801   *
 802   * @since 3.1.0
 803   * @access private
 804   *
 805   * @param array $matches preg_replace_callback matches array
 806   * @return string
 807   */
 808  function _autop_newline_preservation_helper( $matches ) {
 809      return str_replace( "\n", '<WPPreserveNewline />', $matches[0] );
 810  }
 811  
 812  /**
 813   * Don't auto-p wrap shortcodes that stand alone.
 814   *
 815   * Ensures that shortcodes are not wrapped in `<p>...</p>`.
 816   *
 817   * @since 2.9.0
 818   *
 819   * @global array $shortcode_tags
 820   *
 821   * @param string $text The content.
 822   * @return string The filtered content.
 823   */
 824  function shortcode_unautop( $text ) {
 825      global $shortcode_tags;
 826  
 827      if ( empty( $shortcode_tags ) || ! is_array( $shortcode_tags ) ) {
 828          return $text;
 829      }
 830  
 831      $tagregexp = implode( '|', array_map( 'preg_quote', array_keys( $shortcode_tags ) ) );
 832      $spaces    = wp_spaces_regexp();
 833  
 834      // phpcs:disable Squiz.Strings.ConcatenationSpacing.PaddingFound,Universal.WhiteSpace.PrecisionAlignment.Found -- don't remove regex indentation
 835      $pattern =
 836          '/'
 837          . '<p>'                              // Opening paragraph.
 838          . '(?:' . $spaces . ')*+'            // Optional leading whitespace.
 839          . '('                                // 1: The shortcode.
 840          .     '\\['                          // Opening bracket.
 841          .     "($tagregexp)"                 // 2: Shortcode name.
 842          .     '(?![\\w-])'                   // Not followed by word character or hyphen.
 843                                               // Unroll the loop: Inside the opening shortcode tag.
 844          .     '[^\\]\\/]*'                   // Not a closing bracket or forward slash.
 845          .     '(?:'
 846          .         '\\/(?!\\])'               // A forward slash not followed by a closing bracket.
 847          .         '[^\\]\\/]*'               // Not a closing bracket or forward slash.
 848          .     ')*?'
 849          .     '(?:'
 850          .         '\\/\\]'                   // Self closing tag and closing bracket.
 851          .     '|'
 852          .         '\\]'                      // Closing bracket.
 853          .         '(?:'                      // Unroll the loop: Optionally, anything between the opening and closing shortcode tags.
 854          .             '[^\\[]*+'             // Not an opening bracket.
 855          .             '(?:'
 856          .                 '\\[(?!\\/\\2\\])' // An opening bracket not followed by the closing shortcode tag.
 857          .                 '[^\\[]*+'         // Not an opening bracket.
 858          .             ')*+'
 859          .             '\\[\\/\\2\\]'         // Closing shortcode tag.
 860          .         ')?'
 861          .     ')'
 862          . ')'
 863          . '(?:' . $spaces . ')*+'            // Optional trailing whitespace.
 864          . '<\\/p>'                           // Closing paragraph.
 865          . '/';
 866      // phpcs:enable
 867  
 868      return preg_replace( $pattern, '$1', $text );
 869  }
 870  
 871  /**
 872   * Checks to see if a string is utf8 encoded.
 873   *
 874   * NOTE: This function checks for 5-Byte sequences, UTF8
 875   *       has Bytes Sequences with a maximum length of 4.
 876   *
 877   * @author bmorel at ssi dot fr (modified)
 878   * @since 1.2.1
 879   *
 880   * @param string $str The string to be checked.
 881   * @return bool True if $str fits a UTF-8 model, false otherwise.
 882   */
 883  function seems_utf8( $str ) {
 884      mbstring_binary_safe_encoding();
 885      $length = strlen( $str );
 886      reset_mbstring_encoding();
 887  
 888      for ( $i = 0; $i < $length; $i++ ) {
 889          $c = ord( $str[ $i ] );
 890  
 891          if ( $c < 0x80 ) {
 892              $n = 0; // 0bbbbbbb
 893          } elseif ( ( $c & 0xE0 ) === 0xC0 ) {
 894              $n = 1; // 110bbbbb
 895          } elseif ( ( $c & 0xF0 ) === 0xE0 ) {
 896              $n = 2; // 1110bbbb
 897          } elseif ( ( $c & 0xF8 ) === 0xF0 ) {
 898              $n = 3; // 11110bbb
 899          } elseif ( ( $c & 0xFC ) === 0xF8 ) {
 900              $n = 4; // 111110bb
 901          } elseif ( ( $c & 0xFE ) === 0xFC ) {
 902              $n = 5; // 1111110b
 903          } else {
 904              return false; // Does not match any model.
 905          }
 906  
 907          for ( $j = 0; $j < $n; $j++ ) { // n bytes matching 10bbbbbb follow?
 908              if ( ( ++$i === $length ) || ( ( ord( $str[ $i ] ) & 0xC0 ) !== 0x80 ) ) {
 909                  return false;
 910              }
 911          }
 912      }
 913  
 914      return true;
 915  }
 916  
 917  /**
 918   * Converts a number of special characters into their HTML entities.
 919   *
 920   * Specifically deals with: `&`, `<`, `>`, `"`, and `'`.
 921   *
 922   * `$quote_style` can be set to ENT_COMPAT to encode `"` to
 923   * `&quot;`, or ENT_QUOTES to do both. Default is ENT_NOQUOTES where no quotes are encoded.
 924   *
 925   * @since 1.2.2
 926   * @since 5.5.0 `$quote_style` also accepts `ENT_XML1`.
 927   * @access private
 928   *
 929   * @param string       $text          The text which is to be encoded.
 930   * @param int|string   $quote_style   Optional. Converts double quotes if set to ENT_COMPAT,
 931   *                                    both single and double if set to ENT_QUOTES or none if set to ENT_NOQUOTES.
 932   *                                    Converts single and double quotes, as well as converting HTML
 933   *                                    named entities (that are not also XML named entities) to their
 934   *                                    code points if set to ENT_XML1. Also compatible with old values;
 935   *                                    converting single quotes if set to 'single',
 936   *                                    double if set to 'double' or both if otherwise set.
 937   *                                    Default is ENT_NOQUOTES.
 938   * @param false|string $charset       Optional. The character encoding of the string. Default false.
 939   * @param bool         $double_encode Optional. Whether to encode existing HTML entities. Default false.
 940   * @return string The encoded text with HTML entities.
 941   */
 942  function _wp_specialchars( $text, $quote_style = ENT_NOQUOTES, $charset = false, $double_encode = false ) {
 943      $text = (string) $text;
 944  
 945      if ( 0 === strlen( $text ) ) {
 946          return '';
 947      }
 948  
 949      // Don't bother if there are no specialchars - saves some processing.
 950      if ( ! preg_match( '/[&<>"\']/', $text ) ) {
 951          return $text;
 952      }
 953  
 954      // Account for the previous behavior of the function when the $quote_style is not an accepted value.
 955      if ( empty( $quote_style ) ) {
 956          $quote_style = ENT_NOQUOTES;
 957      } elseif ( ENT_XML1 === $quote_style ) {
 958          $quote_style = ENT_QUOTES | ENT_XML1;
 959      } elseif ( ! in_array( $quote_style, array( ENT_NOQUOTES, ENT_COMPAT, ENT_QUOTES, 'single', 'double' ), true ) ) {
 960          $quote_style = ENT_QUOTES;
 961      }
 962  
 963      $charset = _canonical_charset( $charset ? $charset : get_option( 'blog_charset' ) );
 964  
 965      $_quote_style = $quote_style;
 966  
 967      if ( 'double' === $quote_style ) {
 968          $quote_style  = ENT_COMPAT;
 969          $_quote_style = ENT_COMPAT;
 970      } elseif ( 'single' === $quote_style ) {
 971          $quote_style = ENT_NOQUOTES;
 972      }
 973  
 974      if ( ! $double_encode ) {
 975          /*
 976           * Guarantee every &entity; is valid, convert &garbage; into &amp;garbage;
 977           * This is required for PHP < 5.4.0 because ENT_HTML401 flag is unavailable.
 978           */
 979          $text = wp_kses_normalize_entities( $text, ( $quote_style & ENT_XML1 ) ? 'xml' : 'html' );
 980      }
 981  
 982      $text = htmlspecialchars( $text, $quote_style, $charset, $double_encode );
 983  
 984      // Back-compat.
 985      if ( 'single' === $_quote_style ) {
 986          $text = str_replace( "'", '&#039;', $text );
 987      }
 988  
 989      return $text;
 990  }
 991  
 992  /**
 993   * Converts a number of HTML entities into their special characters.
 994   *
 995   * Specifically deals with: `&`, `<`, `>`, `"`, and `'`.
 996   *
 997   * `$quote_style` can be set to ENT_COMPAT to decode `"` entities,
 998   * or ENT_QUOTES to do both `"` and `'`. Default is ENT_NOQUOTES where no quotes are decoded.
 999   *
1000   * @since 2.8.0
1001   *
1002   * @param string     $text        The text which is to be decoded.
1003   * @param string|int $quote_style Optional. Converts double quotes if set to ENT_COMPAT,
1004   *                                both single and double if set to ENT_QUOTES or
1005   *                                none if set to ENT_NOQUOTES.
1006   *                                Also compatible with old _wp_specialchars() values;
1007   *                                converting single quotes if set to 'single',
1008   *                                double if set to 'double' or both if otherwise set.
1009   *                                Default is ENT_NOQUOTES.
1010   * @return string The decoded text without HTML entities.
1011   */
1012  function wp_specialchars_decode( $text, $quote_style = ENT_NOQUOTES ) {
1013      $text = (string) $text;
1014  
1015      if ( 0 === strlen( $text ) ) {
1016          return '';
1017      }
1018  
1019      // Don't bother if there are no entities - saves a lot of processing.
1020      if ( ! str_contains( $text, '&' ) ) {
1021          return $text;
1022      }
1023  
1024      // Match the previous behavior of _wp_specialchars() when the $quote_style is not an accepted value.
1025      if ( empty( $quote_style ) ) {
1026          $quote_style = ENT_NOQUOTES;
1027      } elseif ( ! in_array( $quote_style, array( 0, 2, 3, 'single', 'double' ), true ) ) {
1028          $quote_style = ENT_QUOTES;
1029      }
1030  
1031      // More complete than get_html_translation_table( HTML_SPECIALCHARS ).
1032      $single      = array(
1033          '&#039;' => '\'',
1034          '&#x27;' => '\'',
1035      );
1036      $single_preg = array(
1037          '/&#0*39;/'   => '&#039;',
1038          '/&#x0*27;/i' => '&#x27;',
1039      );
1040      $double      = array(
1041          '&quot;' => '"',
1042          '&#034;' => '"',
1043          '&#x22;' => '"',
1044      );
1045      $double_preg = array(
1046          '/&#0*34;/'   => '&#034;',
1047          '/&#x0*22;/i' => '&#x22;',
1048      );
1049      $others      = array(
1050          '&lt;'   => '<',
1051          '&#060;' => '<',
1052          '&gt;'   => '>',
1053          '&#062;' => '>',
1054          '&amp;'  => '&',
1055          '&#038;' => '&',
1056          '&#x26;' => '&',
1057      );
1058      $others_preg = array(
1059          '/&#0*60;/'   => '&#060;',
1060          '/&#0*62;/'   => '&#062;',
1061          '/&#0*38;/'   => '&#038;',
1062          '/&#x0*26;/i' => '&#x26;',
1063      );
1064  
1065      if ( ENT_QUOTES === $quote_style ) {
1066          $translation      = array_merge( $single, $double, $others );
1067          $translation_preg = array_merge( $single_preg, $double_preg, $others_preg );
1068      } elseif ( ENT_COMPAT === $quote_style || 'double' === $quote_style ) {
1069          $translation      = array_merge( $double, $others );
1070          $translation_preg = array_merge( $double_preg, $others_preg );
1071      } elseif ( 'single' === $quote_style ) {
1072          $translation      = array_merge( $single, $others );
1073          $translation_preg = array_merge( $single_preg, $others_preg );
1074      } elseif ( ENT_NOQUOTES === $quote_style ) {
1075          $translation      = $others;
1076          $translation_preg = $others_preg;
1077      }
1078  
1079      // Remove zero padding on numeric entities.
1080      $text = preg_replace( array_keys( $translation_preg ), array_values( $translation_preg ), $text );
1081  
1082      // Replace characters according to translation table.
1083      return strtr( $text, $translation );
1084  }
1085  
1086  /**
1087   * Checks for invalid UTF8 in a string.
1088   *
1089   * @since 2.8.0
1090   *
1091   * @param string $text   The text which is to be checked.
1092   * @param bool   $strip  Optional. Whether to attempt to strip out invalid UTF8. Default false.
1093   * @return string The checked text.
1094   */
1095  function wp_check_invalid_utf8( $text, $strip = false ) {
1096      $text = (string) $text;
1097  
1098      if ( 0 === strlen( $text ) ) {
1099          return '';
1100      }
1101  
1102      // Store the site charset as a static to avoid multiple calls to get_option().
1103      static $is_utf8 = null;
1104      if ( ! isset( $is_utf8 ) ) {
1105          $is_utf8 = is_utf8_charset();
1106      }
1107      if ( ! $is_utf8 ) {
1108          return $text;
1109      }
1110  
1111      // Check for support for utf8 in the installed PCRE library once and store the result in a static.
1112      static $utf8_pcre = null;
1113      if ( ! isset( $utf8_pcre ) ) {
1114          // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged
1115          $utf8_pcre = @preg_match( '/^./u', 'a' );
1116      }
1117      // We can't demand utf8 in the PCRE installation, so just return the string in those cases.
1118      if ( ! $utf8_pcre ) {
1119          return $text;
1120      }
1121  
1122      // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged -- preg_match fails when it encounters invalid UTF8 in $text.
1123      if ( 1 === @preg_match( '/^./us', $text ) ) {
1124          return $text;
1125      }
1126  
1127      // Attempt to strip the bad chars if requested (not recommended).
1128      if ( $strip && function_exists( 'iconv' ) ) {
1129          return iconv( 'utf-8', 'utf-8', $text );
1130      }
1131  
1132      return '';
1133  }
1134  
1135  /**
1136   * Encodes the Unicode values to be used in the URI.
1137   *
1138   * @since 1.5.0
1139   * @since 5.8.3 Added the `encode_ascii_characters` parameter.
1140   *
1141   * @param string $utf8_string             String to encode.
1142   * @param int    $length                  Max length of the string.
1143   * @param bool   $encode_ascii_characters Whether to encode ascii characters such as < " '
1144   * @return string String with Unicode encoded for URI.
1145   */
1146  function utf8_uri_encode( $utf8_string, $length = 0, $encode_ascii_characters = false ) {
1147      $unicode        = '';
1148      $values         = array();
1149      $num_octets     = 1;
1150      $unicode_length = 0;
1151  
1152      mbstring_binary_safe_encoding();
1153      $string_length = strlen( $utf8_string );
1154      reset_mbstring_encoding();
1155  
1156      for ( $i = 0; $i < $string_length; $i++ ) {
1157  
1158          $value = ord( $utf8_string[ $i ] );
1159  
1160          if ( $value < 128 ) {
1161              $char                = chr( $value );
1162              $encoded_char        = $encode_ascii_characters ? rawurlencode( $char ) : $char;
1163              $encoded_char_length = strlen( $encoded_char );
1164              if ( $length && ( $unicode_length + $encoded_char_length ) > $length ) {
1165                  break;
1166              }
1167              $unicode        .= $encoded_char;
1168              $unicode_length += $encoded_char_length;
1169          } else {
1170              if ( count( $values ) === 0 ) {
1171                  if ( $value < 224 ) {
1172                      $num_octets = 2;
1173                  } elseif ( $value < 240 ) {
1174                      $num_octets = 3;
1175                  } else {
1176                      $num_octets = 4;
1177                  }
1178              }
1179  
1180              $values[] = $value;
1181  
1182              if ( $length && ( $unicode_length + ( $num_octets * 3 ) ) > $length ) {
1183                  break;
1184              }
1185              if ( count( $values ) === $num_octets ) {
1186                  for ( $j = 0; $j < $num_octets; $j++ ) {
1187                      $unicode .= '%' . dechex( $values[ $j ] );
1188                  }
1189  
1190                  $unicode_length += $num_octets * 3;
1191  
1192                  $values     = array();
1193                  $num_octets = 1;
1194              }
1195          }
1196      }
1197  
1198      return $unicode;
1199  }
1200  
1201  /**
1202   * Converts all accent characters to ASCII characters.
1203   *
1204   * If there are no accent characters, then the string given is just returned.
1205   *
1206   * **Accent characters converted:**
1207   *
1208   * Currency signs:
1209   *
1210   * |   Code   | Glyph | Replacement |     Description     |
1211   * | -------- | ----- | ----------- | ------------------- |
1212   * | U+00A3   | £     | (empty)     | British Pound sign  |
1213   * | U+20AC   | €     | E           | Euro sign           |
1214   *
1215   * Decompositions for Latin-1 Supplement:
1216   *
1217   * |  Code   | Glyph | Replacement |               Description              |
1218   * | ------- | ----- | ----------- | -------------------------------------- |
1219   * | U+00AA  | ª     | a           | Feminine ordinal indicator             |
1220   * | U+00BA  | º     | o           | Masculine ordinal indicator            |
1221   * | U+00C0  | À     | A           | Latin capital letter A with grave      |
1222   * | U+00C1  | Á     | A           | Latin capital letter A with acute      |
1223   * | U+00C2  | Â     | A           | Latin capital letter A with circumflex |
1224   * | U+00C3  | Ã     | A           | Latin capital letter A with tilde      |
1225   * | U+00C4  | Ä     | A           | Latin capital letter A with diaeresis  |
1226   * | U+00C5  | Å     | A           | Latin capital letter A with ring above |
1227   * | U+00C6  | Æ     | AE          | Latin capital letter AE                |
1228   * | U+00C7  | Ç     | C           | Latin capital letter C with cedilla    |
1229   * | U+00C8  | È     | E           | Latin capital letter E with grave      |
1230   * | U+00C9  | É     | E           | Latin capital letter E with acute      |
1231   * | U+00CA  | Ê     | E           | Latin capital letter E with circumflex |
1232   * | U+00CB  | Ë     | E           | Latin capital letter E with diaeresis  |
1233   * | U+00CC  | Ì     | I           | Latin capital letter I with grave      |
1234   * | U+00CD  | Í     | I           | Latin capital letter I with acute      |
1235   * | U+00CE  | Î     | I           | Latin capital letter I with circumflex |
1236   * | U+00CF  | Ï     | I           | Latin capital letter I with diaeresis  |
1237   * | U+00D0  | Ð     | D           | Latin capital letter Eth               |
1238   * | U+00D1  | Ñ     | N           | Latin capital letter N with tilde      |
1239   * | U+00D2  | Ò     | O           | Latin capital letter O with grave      |
1240   * | U+00D3  | Ó     | O           | Latin capital letter O with acute      |
1241   * | U+00D4  | Ô     | O           | Latin capital letter O with circumflex |
1242   * | U+00D5  | Õ     | O           | Latin capital letter O with tilde      |
1243   * | U+00D6  | Ö     | O           | Latin capital letter O with diaeresis  |
1244   * | U+00D8  | Ø     | O           | Latin capital letter O with stroke     |
1245   * | U+00D9  | Ù     | U           | Latin capital letter U with grave      |
1246   * | U+00DA  | Ú     | U           | Latin capital letter U with acute      |
1247   * | U+00DB  | Û     | U           | Latin capital letter U with circumflex |
1248   * | U+00DC  | Ü     | U           | Latin capital letter U with diaeresis  |
1249   * | U+00DD  | Ý     | Y           | Latin capital letter Y with acute      |
1250   * | U+00DE  | Þ     | TH          | Latin capital letter Thorn             |
1251   * | U+00DF  | ß     | s           | Latin small letter sharp s             |
1252   * | U+00E0  | à     | a           | Latin small letter a with grave        |
1253   * | U+00E1  | á     | a           | Latin small letter a with acute        |
1254   * | U+00E2  | â     | a           | Latin small letter a with circumflex   |
1255   * | U+00E3  | ã     | a           | Latin small letter a with tilde        |
1256   * | U+00E4  | ä     | a           | Latin small letter a with diaeresis    |
1257   * | U+00E5  | å     | a           | Latin small letter a with ring above   |
1258   * | U+00E6  | æ     | ae          | Latin small letter ae                  |
1259   * | U+00E7  | ç     | c           | Latin small letter c with cedilla      |
1260   * | U+00E8  | è     | e           | Latin small letter e with grave        |
1261   * | U+00E9  | é     | e           | Latin small letter e with acute        |
1262   * | U+00EA  | ê     | e           | Latin small letter e with circumflex   |
1263   * | U+00EB  | ë     | e           | Latin small letter e with diaeresis    |
1264   * | U+00EC  | ì     | i           | Latin small letter i with grave        |
1265   * | U+00ED  | í     | i           | Latin small letter i with acute        |
1266   * | U+00EE  | î     | i           | Latin small letter i with circumflex   |
1267   * | U+00EF  | ï     | i           | Latin small letter i with diaeresis    |
1268   * | U+00F0  | ð     | d           | Latin small letter Eth                 |
1269   * | U+00F1  | ñ     | n           | Latin small letter n with tilde        |
1270   * | U+00F2  | ò     | o           | Latin small letter o with grave        |
1271   * | U+00F3  | ó     | o           | Latin small letter o with acute        |
1272   * | U+00F4  | ô     | o           | Latin small letter o with circumflex   |
1273   * | U+00F5  | õ     | o           | Latin small letter o with tilde        |
1274   * | U+00F6  | ö     | o           | Latin small letter o with diaeresis    |
1275   * | U+00F8  | ø     | o           | Latin small letter o with stroke       |
1276   * | U+00F9  | ù     | u           | Latin small letter u with grave        |
1277   * | U+00FA  | ú     | u           | Latin small letter u with acute        |
1278   * | U+00FB  | û     | u           | Latin small letter u with circumflex   |
1279   * | U+00FC  | ü     | u           | Latin small letter u with diaeresis    |
1280   * | U+00FD  | ý     | y           | Latin small letter y with acute        |
1281   * | U+00FE  | þ     | th          | Latin small letter Thorn               |
1282   * | U+00FF  | ÿ     | y           | Latin small letter y with diaeresis    |
1283   *
1284   * Decompositions for Latin Extended-A:
1285   *
1286   * |  Code   | Glyph | Replacement |                    Description                    |
1287   * | ------- | ----- | ----------- | ------------------------------------------------- |
1288   * | U+0100  | Ā     | A           | Latin capital letter A with macron                |
1289   * | U+0101  | ā     | a           | Latin small letter a with macron                  |
1290   * | U+0102  | Ă     | A           | Latin capital letter A with breve                 |
1291   * | U+0103  | ă     | a           | Latin small letter a with breve                   |
1292   * | U+0104  | Ą     | A           | Latin capital letter A with ogonek                |
1293   * | U+0105  | ą     | a           | Latin small letter a with ogonek                  |
1294   * | U+01006 | Ć     | C           | Latin capital letter C with acute                 |
1295   * | U+0107  | ć     | c           | Latin small letter c with acute                   |
1296   * | U+0108  | Ĉ     | C           | Latin capital letter C with circumflex            |
1297   * | U+0109  | ĉ     | c           | Latin small letter c with circumflex              |
1298   * | U+010A  | Ċ     | C           | Latin capital letter C with dot above             |
1299   * | U+010B  | ċ     | c           | Latin small letter c with dot above               |
1300   * | U+010C  | Č     | C           | Latin capital letter C with caron                 |
1301   * | U+010D  | č     | c           | Latin small letter c with caron                   |
1302   * | U+010E  | Ď     | D           | Latin capital letter D with caron                 |
1303   * | U+010F  | ď     | d           | Latin small letter d with caron                   |
1304   * | U+0110  | Đ     | D           | Latin capital letter D with stroke                |
1305   * | U+0111  | đ     | d           | Latin small letter d with stroke                  |
1306   * | U+0112  | Ē     | E           | Latin capital letter E with macron                |
1307   * | U+0113  | ē     | e           | Latin small letter e with macron                  |
1308   * | U+0114  | Ĕ     | E           | Latin capital letter E with breve                 |
1309   * | U+0115  | ĕ     | e           | Latin small letter e with breve                   |
1310   * | U+0116  | Ė     | E           | Latin capital letter E with dot above             |
1311   * | U+0117  | ė     | e           | Latin small letter e with dot above               |
1312   * | U+0118  | Ę     | E           | Latin capital letter E with ogonek                |
1313   * | U+0119  | ę     | e           | Latin small letter e with ogonek                  |
1314   * | U+011A  | Ě     | E           | Latin capital letter E with caron                 |
1315   * | U+011B  | ě     | e           | Latin small letter e with caron                   |
1316   * | U+011C  | Ĝ     | G           | Latin capital letter G with circumflex            |
1317   * | U+011D  | ĝ     | g           | Latin small letter g with circumflex              |
1318   * | U+011E  | Ğ     | G           | Latin capital letter G with breve                 |
1319   * | U+011F  | ğ     | g           | Latin small letter g with breve                   |
1320   * | U+0120  | Ġ     | G           | Latin capital letter G with dot above             |
1321   * | U+0121  | ġ     | g           | Latin small letter g with dot above               |
1322   * | U+0122  | Ģ     | G           | Latin capital letter G with cedilla               |
1323   * | U+0123  | ģ     | g           | Latin small letter g with cedilla                 |
1324   * | U+0124  | Ĥ     | H           | Latin capital letter H with circumflex            |
1325   * | U+0125  | ĥ     | h           | Latin small letter h with circumflex              |
1326   * | U+0126  | Ħ     | H           | Latin capital letter H with stroke                |
1327   * | U+0127  | ħ     | h           | Latin small letter h with stroke                  |
1328   * | U+0128  | Ĩ     | I           | Latin capital letter I with tilde                 |
1329   * | U+0129  | ĩ     | i           | Latin small letter i with tilde                   |
1330   * | U+012A  | Ī     | I           | Latin capital letter I with macron                |
1331   * | U+012B  | ī     | i           | Latin small letter i with macron                  |
1332   * | U+012C  | Ĭ     | I           | Latin capital letter I with breve                 |
1333   * | U+012D  | ĭ     | i           | Latin small letter i with breve                   |
1334   * | U+012E  | Į     | I           | Latin capital letter I with ogonek                |
1335   * | U+012F  | į     | i           | Latin small letter i with ogonek                  |
1336   * | U+0130  | İ     | I           | Latin capital letter I with dot above             |
1337   * | U+0131  | ı     | i           | Latin small letter dotless i                      |
1338   * | U+0132  | IJ     | IJ          | Latin capital ligature IJ                         |
1339   * | U+0133  | ij     | ij          | Latin small ligature ij                           |
1340   * | U+0134  | Ĵ     | J           | Latin capital letter J with circumflex            |
1341   * | U+0135  | ĵ     | j           | Latin small letter j with circumflex              |
1342   * | U+0136  | Ķ     | K           | Latin capital letter K with cedilla               |
1343   * | U+0137  | ķ     | k           | Latin small letter k with cedilla                 |
1344   * | U+0138  | ĸ     | k           | Latin small letter Kra                            |
1345   * | U+0139  | Ĺ     | L           | Latin capital letter L with acute                 |
1346   * | U+013A  | ĺ     | l           | Latin small letter l with acute                   |
1347   * | U+013B  | Ļ     | L           | Latin capital letter L with cedilla               |
1348   * | U+013C  | ļ     | l           | Latin small letter l with cedilla                 |
1349   * | U+013D  | Ľ     | L           | Latin capital letter L with caron                 |
1350   * | U+013E  | ľ     | l           | Latin small letter l with caron                   |
1351   * | U+013F  | Ŀ     | L           | Latin capital letter L with middle dot            |
1352   * | U+0140  | ŀ     | l           | Latin small letter l with middle dot              |
1353   * | U+0141  | Ł     | L           | Latin capital letter L with stroke                |
1354   * | U+0142  | ł     | l           | Latin small letter l with stroke                  |
1355   * | U+0143  | Ń     | N           | Latin capital letter N with acute                 |
1356   * | U+0144  | ń     | n           | Latin small letter N with acute                   |
1357   * | U+0145  | Ņ     | N           | Latin capital letter N with cedilla               |
1358   * | U+0146  | ņ     | n           | Latin small letter n with cedilla                 |
1359   * | U+0147  | Ň     | N           | Latin capital letter N with caron                 |
1360   * | U+0148  | ň     | n           | Latin small letter n with caron                   |
1361   * | U+0149  | ʼn     | n           | Latin small letter n preceded by apostrophe       |
1362   * | U+014A  | Ŋ     | N           | Latin capital letter Eng                          |
1363   * | U+014B  | ŋ     | n           | Latin small letter Eng                            |
1364   * | U+014C  | Ō     | O           | Latin capital letter O with macron                |
1365   * | U+014D  | ō     | o           | Latin small letter o with macron                  |
1366   * | U+014E  | Ŏ     | O           | Latin capital letter O with breve                 |
1367   * | U+014F  | ŏ     | o           | Latin small letter o with breve                   |
1368   * | U+0150  | Ő     | O           | Latin capital letter O with double acute          |
1369   * | U+0151  | ő     | o           | Latin small letter o with double acute            |
1370   * | U+0152  | Œ     | OE          | Latin capital ligature OE                         |
1371   * | U+0153  | œ     | oe          | Latin small ligature oe                           |
1372   * | U+0154  | Ŕ     | R           | Latin capital letter R with acute                 |
1373   * | U+0155  | ŕ     | r           | Latin small letter r with acute                   |
1374   * | U+0156  | Ŗ     | R           | Latin capital letter R with cedilla               |
1375   * | U+0157  | ŗ     | r           | Latin small letter r with cedilla                 |
1376   * | U+0158  | Ř     | R           | Latin capital letter R with caron                 |
1377   * | U+0159  | ř     | r           | Latin small letter r with caron                   |
1378   * | U+015A  | Ś     | S           | Latin capital letter S with acute                 |
1379   * | U+015B  | ś     | s           | Latin small letter s with acute                   |
1380   * | U+015C  | Ŝ     | S           | Latin capital letter S with circumflex            |
1381   * | U+015D  | ŝ     | s           | Latin small letter s with circumflex              |
1382   * | U+015E  | Ş     | S           | Latin capital letter S with cedilla               |
1383   * | U+015F  | ş     | s           | Latin small letter s with cedilla                 |
1384   * | U+0160  | Š     | S           | Latin capital letter S with caron                 |
1385   * | U+0161  | š     | s           | Latin small letter s with caron                   |
1386   * | U+0162  | Ţ     | T           | Latin capital letter T with cedilla               |
1387   * | U+0163  | ţ     | t           | Latin small letter t with cedilla                 |
1388   * | U+0164  | Ť     | T           | Latin capital letter T with caron                 |
1389   * | U+0165  | ť     | t           | Latin small letter t with caron                   |
1390   * | U+0166  | Ŧ     | T           | Latin capital letter T with stroke                |
1391   * | U+0167  | ŧ     | t           | Latin small letter t with stroke                  |
1392   * | U+0168  | Ũ     | U           | Latin capital letter U with tilde                 |
1393   * | U+0169  | ũ     | u           | Latin small letter u with tilde                   |
1394   * | U+016A  | Ū     | U           | Latin capital letter U with macron                |
1395   * | U+016B  | ū     | u           | Latin small letter u with macron                  |
1396   * | U+016C  | Ŭ     | U           | Latin capital letter U with breve                 |
1397   * | U+016D  | ŭ     | u           | Latin small letter u with breve                   |
1398   * | U+016E  | Ů     | U           | Latin capital letter U with ring above            |
1399   * | U+016F  | ů     | u           | Latin small letter u with ring above              |
1400   * | U+0170  | Ű     | U           | Latin capital letter U with double acute          |
1401   * | U+0171  | ű     | u           | Latin small letter u with double acute            |
1402   * | U+0172  | Ų     | U           | Latin capital letter U with ogonek                |
1403   * | U+0173  | ų     | u           | Latin small letter u with ogonek                  |
1404   * | U+0174  | Ŵ     | W           | Latin capital letter W with circumflex            |
1405   * | U+0175  | ŵ     | w           | Latin small letter w with circumflex              |
1406   * | U+0176  | Ŷ     | Y           | Latin capital letter Y with circumflex            |
1407   * | U+0177  | ŷ     | y           | Latin small letter y with circumflex              |
1408   * | U+0178  | Ÿ     | Y           | Latin capital letter Y with diaeresis             |
1409   * | U+0179  | Ź     | Z           | Latin capital letter Z with acute                 |
1410   * | U+017A  | ź     | z           | Latin small letter z with acute                   |
1411   * | U+017B  | Ż     | Z           | Latin capital letter Z with dot above             |
1412   * | U+017C  | ż     | z           | Latin small letter z with dot above               |
1413   * | U+017D  | Ž     | Z           | Latin capital letter Z with caron                 |
1414   * | U+017E  | ž     | z           | Latin small letter z with caron                   |
1415   * | U+017F  | ſ     | s           | Latin small letter long s                         |
1416   * | U+01A0  | Ơ     | O           | Latin capital letter O with horn                  |
1417   * | U+01A1  | ơ     | o           | Latin small letter o with horn                    |
1418   * | U+01AF  | Ư     | U           | Latin capital letter U with horn                  |
1419   * | U+01B0  | ư     | u           | Latin small letter u with horn                    |
1420   * | U+01CD  | Ǎ     | A           | Latin capital letter A with caron                 |
1421   * | U+01CE  | ǎ     | a           | Latin small letter a with caron                   |
1422   * | U+01CF  | Ǐ     | I           | Latin capital letter I with caron                 |
1423   * | U+01D0  | ǐ     | i           | Latin small letter i with caron                   |
1424   * | U+01D1  | Ǒ     | O           | Latin capital letter O with caron                 |
1425   * | U+01D2  | ǒ     | o           | Latin small letter o with caron                   |
1426   * | U+01D3  | Ǔ     | U           | Latin capital letter U with caron                 |
1427   * | U+01D4  | ǔ     | u           | Latin small letter u with caron                   |
1428   * | U+01D5  | Ǖ     | U           | Latin capital letter U with diaeresis and macron  |
1429   * | U+01D6  | ǖ     | u           | Latin small letter u with diaeresis and macron    |
1430   * | U+01D7  | Ǘ     | U           | Latin capital letter U with diaeresis and acute   |
1431   * | U+01D8  | ǘ     | u           | Latin small letter u with diaeresis and acute     |
1432   * | U+01D9  | Ǚ     | U           | Latin capital letter U with diaeresis and caron   |
1433   * | U+01DA  | ǚ     | u           | Latin small letter u with diaeresis and caron     |
1434   * | U+01DB  | Ǜ     | U           | Latin capital letter U with diaeresis and grave   |
1435   * | U+01DC  | ǜ     | u           | Latin small letter u with diaeresis and grave     |
1436   *
1437   * Decompositions for Latin Extended-B:
1438   *
1439   * |   Code   | Glyph | Replacement |                Description                |
1440   * | -------- | ----- | ----------- | ----------------------------------------- |
1441   * | U+018F   | Ə     | E           | Latin capital letter Ə                    |
1442   * | U+0259   | ǝ     | e           | Latin small letter ǝ                      |
1443   * | U+0218   | Ș     | S           | Latin capital letter S with comma below   |
1444   * | U+0219   | ș     | s           | Latin small letter s with comma below     |
1445   * | U+021A   | Ț     | T           | Latin capital letter T with comma below   |
1446   * | U+021B   | ț     | t           | Latin small letter t with comma below     |
1447   *
1448   * Vowels with diacritic (Chinese, Hanyu Pinyin):
1449   *
1450   * |   Code   | Glyph | Replacement |                      Description                      |
1451   * | -------- | ----- | ----------- | ----------------------------------------------------- |
1452   * | U+0251   | ɑ     | a           | Latin small letter alpha                              |
1453   * | U+1EA0   | Ạ     | A           | Latin capital letter A with dot below                 |
1454   * | U+1EA1   | ạ     | a           | Latin small letter a with dot below                   |
1455   * | U+1EA2   | Ả     | A           | Latin capital letter A with hook above                |
1456   * | U+1EA3   | ả     | a           | Latin small letter a with hook above                  |
1457   * | U+1EA4   | Ấ     | A           | Latin capital letter A with circumflex and acute      |
1458   * | U+1EA5   | ấ     | a           | Latin small letter a with circumflex and acute        |
1459   * | U+1EA6   | Ầ     | A           | Latin capital letter A with circumflex and grave      |
1460   * | U+1EA7   | ầ     | a           | Latin small letter a with circumflex and grave        |
1461   * | U+1EA8   | Ẩ     | A           | Latin capital letter A with circumflex and hook above |
1462   * | U+1EA9   | ẩ     | a           | Latin small letter a with circumflex and hook above   |
1463   * | U+1EAA   | Ẫ     | A           | Latin capital letter A with circumflex and tilde      |
1464   * | U+1EAB   | ẫ     | a           | Latin small letter a with circumflex and tilde        |
1465   * | U+1EA6   | Ậ     | A           | Latin capital letter A with circumflex and dot below  |
1466   * | U+1EAD   | ậ     | a           | Latin small letter a with circumflex and dot below    |
1467   * | U+1EAE   | Ắ     | A           | Latin capital letter A with breve and acute           |
1468   * | U+1EAF   | ắ     | a           | Latin small letter a with breve and acute             |
1469   * | U+1EB0   | Ằ     | A           | Latin capital letter A with breve and grave           |
1470   * | U+1EB1   | ằ     | a           | Latin small letter a with breve and grave             |
1471   * | U+1EB2   | Ẳ     | A           | Latin capital letter A with breve and hook above      |
1472   * | U+1EB3   | ẳ     | a           | Latin small letter a with breve and hook above        |
1473   * | U+1EB4   | Ẵ     | A           | Latin capital letter A with breve and tilde           |
1474   * | U+1EB5   | ẵ     | a           | Latin small letter a with breve and tilde             |
1475   * | U+1EB6   | Ặ     | A           | Latin capital letter A with breve and dot below       |
1476   * | U+1EB7   | ặ     | a           | Latin small letter a with breve and dot below         |
1477   * | U+1EB8   | Ẹ     | E           | Latin capital letter E with dot below                 |
1478   * | U+1EB9   | ẹ     | e           | Latin small letter e with dot below                   |
1479   * | U+1EBA   | Ẻ     | E           | Latin capital letter E with hook above                |
1480   * | U+1EBB   | ẻ     | e           | Latin small letter e with hook above                  |
1481   * | U+1EBC   | Ẽ     | E           | Latin capital letter E with tilde                     |
1482   * | U+1EBD   | ẽ     | e           | Latin small letter e with tilde                       |
1483   * | U+1EBE   | Ế     | E           | Latin capital letter E with circumflex and acute      |
1484   * | U+1EBF   | ế     | e           | Latin small letter e with circumflex and acute        |
1485   * | U+1EC0   | Ề     | E           | Latin capital letter E with circumflex and grave      |
1486   * | U+1EC1   | ề     | e           | Latin small letter e with circumflex and grave        |
1487   * | U+1EC2   | Ể     | E           | Latin capital letter E with circumflex and hook above |
1488   * | U+1EC3   | ể     | e           | Latin small letter e with circumflex and hook above   |
1489   * | U+1EC4   | Ễ     | E           | Latin capital letter E with circumflex and tilde      |
1490   * | U+1EC5   | ễ     | e           | Latin small letter e with circumflex and tilde        |
1491   * | U+1EC6   | Ệ     | E           | Latin capital letter E with circumflex and dot below  |
1492   * | U+1EC7   | ệ     | e           | Latin small letter e with circumflex and dot below    |
1493   * | U+1EC8   | Ỉ     | I           | Latin capital letter I with hook above                |
1494   * | U+1EC9   | ỉ     | i           | Latin small letter i with hook above                  |
1495   * | U+1ECA   | Ị     | I           | Latin capital letter I with dot below                 |
1496   * | U+1ECB   | ị     | i           | Latin small letter i with dot below                   |
1497   * | U+1ECC   | Ọ     | O           | Latin capital letter O with dot below                 |
1498   * | U+1ECD   | ọ     | o           | Latin small letter o with dot below                   |
1499   * | U+1ECE   | Ỏ     | O           | Latin capital letter O with hook above                |
1500   * | U+1ECF   | ỏ     | o           | Latin small letter o with hook above                  |
1501   * | U+1ED0   | Ố     | O           | Latin capital letter O with circumflex and acute      |
1502   * | U+1ED1   | ố     | o           | Latin small letter o with circumflex and acute        |
1503   * | U+1ED2   | Ồ     | O           | Latin capital letter O with circumflex and grave      |
1504   * | U+1ED3   | ồ     | o           | Latin small letter o with circumflex and grave        |
1505   * | U+1ED4   | Ổ     | O           | Latin capital letter O with circumflex and hook above |
1506   * | U+1ED5   | ổ     | o           | Latin small letter o with circumflex and hook above   |
1507   * | U+1ED6   | Ỗ     | O           | Latin capital letter O with circumflex and tilde      |
1508   * | U+1ED7   | ỗ     | o           | Latin small letter o with circumflex and tilde        |
1509   * | U+1ED8   | Ộ     | O           | Latin capital letter O with circumflex and dot below  |
1510   * | U+1ED9   | ộ     | o           | Latin small letter o with circumflex and dot below    |
1511   * | U+1EDA   | Ớ     | O           | Latin capital letter O with horn and acute            |
1512   * | U+1EDB   | ớ     | o           | Latin small letter o with horn and acute              |
1513   * | U+1EDC   | Ờ     | O           | Latin capital letter O with horn and grave            |
1514   * | U+1EDD   | ờ     | o           | Latin small letter o with horn and grave              |
1515   * | U+1EDE   | Ở     | O           | Latin capital letter O with horn and hook above       |
1516   * | U+1EDF   | ở     | o           | Latin small letter o with horn and hook above         |
1517   * | U+1EE0   | Ỡ     | O           | Latin capital letter O with horn and tilde            |
1518   * | U+1EE1   | ỡ     | o           | Latin small letter o with horn and tilde              |
1519   * | U+1EE2   | Ợ     | O           | Latin capital letter O with horn and dot below        |
1520   * | U+1EE3   | ợ     | o           | Latin small letter o with horn and dot below          |
1521   * | U+1EE4   | Ụ     | U           | Latin capital letter U with dot below                 |
1522   * | U+1EE5   | ụ     | u           | Latin small letter u with dot below                   |
1523   * | U+1EE6   | Ủ     | U           | Latin capital letter U with hook above                |
1524   * | U+1EE7   | ủ     | u           | Latin small letter u with hook above                  |
1525   * | U+1EE8   | Ứ     | U           | Latin capital letter U with horn and acute            |
1526   * | U+1EE9   | ứ     | u           | Latin small letter u with horn and acute              |
1527   * | U+1EEA   | Ừ     | U           | Latin capital letter U with horn and grave            |
1528   * | U+1EEB   | ừ     | u           | Latin small letter u with horn and grave              |
1529   * | U+1EEC   | Ử     | U           | Latin capital letter U with horn and hook above       |
1530   * | U+1EED   | ử     | u           | Latin small letter u with horn and hook above         |
1531   * | U+1EEE   | Ữ     | U           | Latin capital letter U with horn and tilde            |
1532   * | U+1EEF   | ữ     | u           | Latin small letter u with horn and tilde              |
1533   * | U+1EF0   | Ự     | U           | Latin capital letter U with horn and dot below        |
1534   * | U+1EF1   | ự     | u           | Latin small letter u with horn and dot below          |
1535   * | U+1EF2   | Ỳ     | Y           | Latin capital letter Y with grave                     |
1536   * | U+1EF3   | ỳ     | y           | Latin small letter y with grave                       |
1537   * | U+1EF4   | Ỵ     | Y           | Latin capital letter Y with dot below                 |
1538   * | U+1EF5   | ỵ     | y           | Latin small letter y with dot below                   |
1539   * | U+1EF6   | Ỷ     | Y           | Latin capital letter Y with hook above                |
1540   * | U+1EF7   | ỷ     | y           | Latin small letter y with hook above                  |
1541   * | U+1EF8   | Ỹ     | Y           | Latin capital letter Y with tilde                     |
1542   * | U+1EF9   | ỹ     | y           | Latin small letter y with tilde                       |
1543   *
1544   * German (`de_DE`), German formal (`de_DE_formal`), German (Switzerland) formal (`de_CH`),
1545   * German (Switzerland) informal (`de_CH_informal`), and German (Austria) (`de_AT`) locales:
1546   *
1547   * |   Code   | Glyph | Replacement |               Description               |
1548   * | -------- | ----- | ----------- | --------------------------------------- |
1549   * | U+00C4   | Ä     | Ae          | Latin capital letter A with diaeresis   |
1550   * | U+00E4   | ä     | ae          | Latin small letter a with diaeresis     |
1551   * | U+00D6   | Ö     | Oe          | Latin capital letter O with diaeresis   |
1552   * | U+00F6   | ö     | oe          | Latin small letter o with diaeresis     |
1553   * | U+00DC   | Ü     | Ue          | Latin capital letter U with diaeresis   |
1554   * | U+00FC   | ü     | ue          | Latin small letter u with diaeresis     |
1555   * | U+00DF   | ß     | ss          | Latin small letter sharp s              |
1556   *
1557   * Danish (`da_DK`) locale:
1558   *
1559   * |   Code   | Glyph | Replacement |               Description               |
1560   * | -------- | ----- | ----------- | --------------------------------------- |
1561   * | U+00C6   | Æ     | Ae          | Latin capital letter AE                 |
1562   * | U+00E6   | æ     | ae          | Latin small letter ae                   |
1563   * | U+00D8   | Ø     | Oe          | Latin capital letter O with stroke      |
1564   * | U+00F8   | ø     | oe          | Latin small letter o with stroke        |
1565   * | U+00C5   | Å     | Aa          | Latin capital letter A with ring above  |
1566   * | U+00E5   | å     | aa          | Latin small letter a with ring above    |
1567   *
1568   * Catalan (`ca`) locale:
1569   *
1570   * |   Code   | Glyph | Replacement |               Description               |
1571   * | -------- | ----- | ----------- | --------------------------------------- |
1572   * | U+00B7   | l·l   | ll          | Flown dot (between two Ls)              |
1573   *
1574   * Serbian (`sr_RS`) and Bosnian (`bs_BA`) locales:
1575   *
1576   * |   Code   | Glyph | Replacement |               Description               |
1577   * | -------- | ----- | ----------- | --------------------------------------- |
1578   * | U+0110   | Đ     | DJ          | Latin capital letter D with stroke      |
1579   * | U+0111   | đ     | dj          | Latin small letter d with stroke        |
1580   *
1581   * @since 1.2.1
1582   * @since 4.6.0 Added locale support for `de_CH`, `de_CH_informal`, and `ca`.
1583   * @since 4.7.0 Added locale support for `sr_RS`.
1584   * @since 4.8.0 Added locale support for `bs_BA`.
1585   * @since 5.7.0 Added locale support for `de_AT`.
1586   * @since 6.0.0 Added the `$locale` parameter.
1587   * @since 6.1.0 Added Unicode NFC encoding normalization support.
1588   *
1589   * @param string $text   Text that might have accent characters.
1590   * @param string $locale Optional. The locale to use for accent removal. Some character
1591   *                       replacements depend on the locale being used (e.g. 'de_DE').
1592   *                       Defaults to the current locale.
1593   * @return string Filtered string with replaced "nice" characters.
1594   */
1595  function remove_accents( $text, $locale = '' ) {
1596      if ( ! preg_match( '/[\x80-\xff]/', $text ) ) {
1597          return $text;
1598      }
1599  
1600      if ( seems_utf8( $text ) ) {
1601  
1602          /*
1603           * Unicode sequence normalization from NFD (Normalization Form Decomposed)
1604           * to NFC (Normalization Form [Pre]Composed), the encoding used in this function.
1605           */
1606          if ( function_exists( 'normalizer_is_normalized' )
1607              && function_exists( 'normalizer_normalize' )
1608          ) {
1609              if ( ! normalizer_is_normalized( $text ) ) {
1610                  $text = normalizer_normalize( $text );
1611              }
1612          }
1613  
1614          $chars = array(
1615              // Decompositions for Latin-1 Supplement.
1616              'ª' => 'a',
1617              'º' => 'o',
1618              'À' => 'A',
1619              'Á' => 'A',
1620              'Â' => 'A',
1621              'Ã' => 'A',
1622              'Ä' => 'A',
1623              'Å' => 'A',
1624              'Æ' => 'AE',
1625              'Ç' => 'C',
1626              'È' => 'E',
1627              'É' => 'E',
1628              'Ê' => 'E',
1629              'Ë' => 'E',
1630              'Ì' => 'I',
1631              'Í' => 'I',
1632              'Î' => 'I',
1633              'Ï' => 'I',
1634              'Ð' => 'D',
1635              'Ñ' => 'N',
1636              'Ò' => 'O',
1637              'Ó' => 'O',
1638              'Ô' => 'O',
1639              'Õ' => 'O',
1640              'Ö' => 'O',
1641              'Ù' => 'U',
1642              'Ú' => 'U',
1643              'Û' => 'U',
1644              'Ü' => 'U',
1645              'Ý' => 'Y',
1646              'Þ' => 'TH',
1647              'ß' => 's',
1648              'à' => 'a',
1649              'á' => 'a',
1650              'â' => 'a',
1651              'ã' => 'a',
1652              'ä' => 'a',
1653              'å' => 'a',
1654              'æ' => 'ae',
1655              'ç' => 'c',
1656              'è' => 'e',
1657              'é' => 'e',
1658              'ê' => 'e',
1659              'ë' => 'e',
1660              'ì' => 'i',
1661              'í' => 'i',
1662              'î' => 'i',
1663              'ï' => 'i',
1664              'ð' => 'd',
1665              'ñ' => 'n',
1666              'ò' => 'o',
1667              'ó' => 'o',
1668              'ô' => 'o',
1669              'õ' => 'o',
1670              'ö' => 'o',
1671              'ø' => 'o',
1672              'ù' => 'u',
1673              'ú' => 'u',
1674              'û' => 'u',
1675              'ü' => 'u',
1676              'ý' => 'y',
1677              'þ' => 'th',
1678              'ÿ' => 'y',
1679              'Ø' => 'O',
1680              // Decompositions for Latin Extended-A.
1681              'Ā' => 'A',
1682              'ā' => 'a',
1683              'Ă' => 'A',
1684              'ă' => 'a',
1685              'Ą' => 'A',
1686              'ą' => 'a',
1687              'Ć' => 'C',
1688              'ć' => 'c',
1689              'Ĉ' => 'C',
1690              'ĉ' => 'c',
1691              'Ċ' => 'C',
1692              'ċ' => 'c',
1693              'Č' => 'C',
1694              'č' => 'c',
1695              'Ď' => 'D',
1696              'ď' => 'd',
1697              'Đ' => 'D',
1698              'đ' => 'd',
1699              'Ē' => 'E',
1700              'ē' => 'e',
1701              'Ĕ' => 'E',
1702              'ĕ' => 'e',
1703              'Ė' => 'E',
1704              'ė' => 'e',
1705              'Ę' => 'E',
1706              'ę' => 'e',
1707              'Ě' => 'E',
1708              'ě' => 'e',
1709              'Ĝ' => 'G',
1710              'ĝ' => 'g',
1711              'Ğ' => 'G',
1712              'ğ' => 'g',
1713              'Ġ' => 'G',
1714              'ġ' => 'g',
1715              'Ģ' => 'G',
1716              'ģ' => 'g',
1717              'Ĥ' => 'H',
1718              'ĥ' => 'h',
1719              'Ħ' => 'H',
1720              'ħ' => 'h',
1721              'Ĩ' => 'I',
1722              'ĩ' => 'i',
1723              'Ī' => 'I',
1724              'ī' => 'i',
1725              'Ĭ' => 'I',
1726              'ĭ' => 'i',
1727              'Į' => 'I',
1728              'į' => 'i',
1729              'İ' => 'I',
1730              'ı' => 'i',
1731              'IJ' => 'IJ',
1732              'ij' => 'ij',
1733              'Ĵ' => 'J',
1734              'ĵ' => 'j',
1735              'Ķ' => 'K',
1736              'ķ' => 'k',
1737              'ĸ' => 'k',
1738              'Ĺ' => 'L',
1739              'ĺ' => 'l',
1740              'Ļ' => 'L',
1741              'ļ' => 'l',
1742              'Ľ' => 'L',
1743              'ľ' => 'l',
1744              'Ŀ' => 'L',
1745              'ŀ' => 'l',
1746              'Ł' => 'L',
1747              'ł' => 'l',
1748              'Ń' => 'N',
1749              'ń' => 'n',
1750              'Ņ' => 'N',
1751              'ņ' => 'n',
1752              'Ň' => 'N',
1753              'ň' => 'n',
1754              'ʼn' => 'n',
1755              'Ŋ' => 'N',
1756              'ŋ' => 'n',
1757              'Ō' => 'O',
1758              'ō' => 'o',
1759              'Ŏ' => 'O',
1760              'ŏ' => 'o',
1761              'Ő' => 'O',
1762              'ő' => 'o',
1763              'Œ' => 'OE',
1764              'œ' => 'oe',
1765              'Ŕ' => 'R',
1766              'ŕ' => 'r',
1767              'Ŗ' => 'R',
1768              'ŗ' => 'r',
1769              'Ř' => 'R',
1770              'ř' => 'r',
1771              'Ś' => 'S',
1772              'ś' => 's',
1773              'Ŝ' => 'S',
1774              'ŝ' => 's',
1775              'Ş' => 'S',
1776              'ş' => 's',
1777              'Š' => 'S',
1778              'š' => 's',
1779              'Ţ' => 'T',
1780              'ţ' => 't',
1781              'Ť' => 'T',
1782              'ť' => 't',
1783              'Ŧ' => 'T',
1784              'ŧ' => 't',
1785              'Ũ' => 'U',
1786              'ũ' => 'u',
1787              'Ū' => 'U',
1788              'ū' => 'u',
1789              'Ŭ' => 'U',
1790              'ŭ' => 'u',
1791              'Ů' => 'U',
1792              'ů' => 'u',
1793              'Ű' => 'U',
1794              'ű' => 'u',
1795              'Ų' => 'U',
1796              'ų' => 'u',
1797              'Ŵ' => 'W',
1798              'ŵ' => 'w',
1799              'Ŷ' => 'Y',
1800              'ŷ' => 'y',
1801              'Ÿ' => 'Y',
1802              'Ź' => 'Z',
1803              'ź' => 'z',
1804              'Ż' => 'Z',
1805              'ż' => 'z',
1806              'Ž' => 'Z',
1807              'ž' => 'z',
1808              'ſ' => 's',
1809              // Decompositions for Latin Extended-B.
1810              'Ə' => 'E',
1811              'ǝ' => 'e',
1812              'Ș' => 'S',
1813              'ș' => 's',
1814              'Ț' => 'T',
1815              'ț' => 't',
1816              // Euro sign.
1817              '€' => 'E',
1818              // GBP (Pound) sign.
1819              '£' => '',
1820              // Vowels with diacritic (Vietnamese). Unmarked.
1821              'Ơ' => 'O',
1822              'ơ' => 'o',
1823              'Ư' => 'U',
1824              'ư' => 'u',
1825              // Grave accent.
1826              'Ầ' => 'A',
1827              'ầ' => 'a',
1828              'Ằ' => 'A',
1829              'ằ' => 'a',
1830              'Ề' => 'E',
1831              'ề' => 'e',
1832              'Ồ' => 'O',
1833              'ồ' => 'o',
1834              'Ờ' => 'O',
1835              'ờ' => 'o',
1836              'Ừ' => 'U',
1837              'ừ' => 'u',
1838              'Ỳ' => 'Y',
1839              'ỳ' => 'y',
1840              // Hook.
1841              'Ả' => 'A',
1842              'ả' => 'a',
1843              'Ẩ' => 'A',
1844              'ẩ' => 'a',
1845              'Ẳ' => 'A',
1846              'ẳ' => 'a',
1847              'Ẻ' => 'E',
1848              'ẻ' => 'e',
1849              'Ể' => 'E',
1850              'ể' => 'e',
1851              'Ỉ' => 'I',
1852              'ỉ' => 'i',
1853              'Ỏ' => 'O',
1854              'ỏ' => 'o',
1855              'Ổ' => 'O',
1856              'ổ' => 'o',
1857              'Ở' => 'O',
1858              'ở' => 'o',
1859              'Ủ' => 'U',
1860              'ủ' => 'u',
1861              'Ử' => 'U',
1862              'ử' => 'u',
1863              'Ỷ' => 'Y',
1864              'ỷ' => 'y',
1865              // Tilde.
1866              'Ẫ' => 'A',
1867              'ẫ' => 'a',
1868              'Ẵ' => 'A',
1869              'ẵ' => 'a',
1870              'Ẽ' => 'E',
1871              'ẽ' => 'e',
1872              'Ễ' => 'E',
1873              'ễ' => 'e',
1874              'Ỗ' => 'O',
1875              'ỗ' => 'o',
1876              'Ỡ' => 'O',
1877              'ỡ' => 'o',
1878              'Ữ' => 'U',
1879              'ữ' => 'u',
1880              'Ỹ' => 'Y',
1881              'ỹ' => 'y',
1882              // Acute accent.
1883              'Ấ' => 'A',
1884              'ấ' => 'a',
1885              'Ắ' => 'A',
1886              'ắ' => 'a',
1887              'Ế' => 'E',
1888              'ế' => 'e',
1889              'Ố' => 'O',
1890              'ố' => 'o',
1891              'Ớ' => 'O',
1892              'ớ' => 'o',
1893              'Ứ' => 'U',
1894              'ứ' => 'u',
1895              // Dot below.
1896              'Ạ' => 'A',
1897              'ạ' => 'a',
1898              'Ậ' => 'A',
1899              'ậ' => 'a',
1900              'Ặ' => 'A',
1901              'ặ' => 'a',
1902              'Ẹ' => 'E',
1903              'ẹ' => 'e',
1904              'Ệ' => 'E',
1905              'ệ' => 'e',
1906              'Ị' => 'I',
1907              'ị' => 'i',
1908              'Ọ' => 'O',
1909              'ọ' => 'o',
1910              'Ộ' => 'O',
1911              'ộ' => 'o',
1912              'Ợ' => 'O',
1913              'ợ' => 'o',
1914              'Ụ' => 'U',
1915              'ụ' => 'u',
1916              'Ự' => 'U',
1917              'ự' => 'u',
1918              'Ỵ' => 'Y',
1919              'ỵ' => 'y',
1920              // Vowels with diacritic (Chinese, Hanyu Pinyin).
1921              'ɑ' => 'a',
1922              // Macron.
1923              'Ǖ' => 'U',
1924              'ǖ' => 'u',
1925              // Acute accent.
1926              'Ǘ' => 'U',
1927              'ǘ' => 'u',
1928              // Caron.
1929              'Ǎ' => 'A',
1930              'ǎ' => 'a',
1931              'Ǐ' => 'I',
1932              'ǐ' => 'i',
1933              'Ǒ' => 'O',
1934              'ǒ' => 'o',
1935              'Ǔ' => 'U',
1936              'ǔ' => 'u',
1937              'Ǚ' => 'U',
1938              'ǚ' => 'u',
1939              // Grave accent.
1940              'Ǜ' => 'U',
1941              'ǜ' => 'u',
1942          );
1943  
1944          // Used for locale-specific rules.
1945          if ( empty( $locale ) ) {
1946              $locale = get_locale();
1947          }
1948  
1949          /*
1950           * German has various locales (de_DE, de_CH, de_AT, ...) with formal and informal variants.
1951           * There is no 3-letter locale like 'def', so checking for 'de' instead of 'de_' is safe,
1952           * since 'de' itself would be a valid locale too.
1953           */
1954          if ( str_starts_with( $locale, 'de' ) ) {
1955              $chars['Ä'] = 'Ae';
1956              $chars['ä'] = 'ae';
1957              $chars['Ö'] = 'Oe';
1958              $chars['ö'] = 'oe';
1959              $chars['Ü'] = 'Ue';
1960              $chars['ü'] = 'ue';
1961              $chars['ß'] = 'ss';
1962          } elseif ( 'da_DK' === $locale ) {
1963              $chars['Æ'] = 'Ae';
1964              $chars['æ'] = 'ae';
1965              $chars['Ø'] = 'Oe';
1966              $chars['ø'] = 'oe';
1967              $chars['Å'] = 'Aa';
1968              $chars['å'] = 'aa';
1969          } elseif ( 'ca' === $locale ) {
1970              $chars['l·l'] = 'll';
1971          } elseif ( 'sr_RS' === $locale || 'bs_BA' === $locale ) {
1972              $chars['Đ'] = 'DJ';
1973              $chars['đ'] = 'dj';
1974          }
1975  
1976          $text = strtr( $text, $chars );
1977      } else {
1978          $chars = array();
1979          // Assume ISO-8859-1 if not UTF-8.
1980          $chars['in'] = "\x80\x83\x8a\x8e\x9a\x9e"
1981              . "\x9f\xa2\xa5\xb5\xc0\xc1\xc2"
1982              . "\xc3\xc4\xc5\xc7\xc8\xc9\xca"
1983              . "\xcb\xcc\xcd\xce\xcf\xd1\xd2"
1984              . "\xd3\xd4\xd5\xd6\xd8\xd9\xda"
1985              . "\xdb\xdc\xdd\xe0\xe1\xe2\xe3"
1986              . "\xe4\xe5\xe7\xe8\xe9\xea\xeb"
1987              . "\xec\xed\xee\xef\xf1\xf2\xf3"
1988              . "\xf4\xf5\xf6\xf8\xf9\xfa\xfb"
1989              . "\xfc\xfd\xff";
1990  
1991          $chars['out'] = 'EfSZszYcYuAAAAAACEEEEIIIINOOOOOOUUUUYaaaaaaceeeeiiiinoooooouuuuyy';
1992  
1993          $text                = strtr( $text, $chars['in'], $chars['out'] );
1994          $double_chars        = array();
1995          $double_chars['in']  = array( "\x8c", "\x9c", "\xc6", "\xd0", "\xde", "\xdf", "\xe6", "\xf0", "\xfe" );
1996          $double_chars['out'] = array( 'OE', 'oe', 'AE', 'DH', 'TH', 'ss', 'ae', 'dh', 'th' );
1997          $text                = str_replace( $double_chars['in'], $double_chars['out'], $text );
1998      }
1999  
2000      return $text;
2001  }
2002  
2003  /**
2004   * Sanitizes a filename, replacing whitespace with dashes.
2005   *
2006   * Removes special characters that are illegal in filenames on certain
2007   * operating systems and special characters requiring special escaping
2008   * to manipulate at the command line. Replaces spaces and consecutive
2009   * dashes with a single dash. Trims period, dash and underscore from beginning
2010   * and end of filename. It is not guaranteed that this function will return a
2011   * filename that is allowed to be uploaded.
2012   *
2013   * @since 2.1.0
2014   *
2015   * @param string $filename The filename to be sanitized.
2016   * @return string The sanitized filename.
2017   */
2018  function sanitize_file_name( $filename ) {
2019      $filename_raw = $filename;
2020      $filename     = remove_accents( $filename );
2021  
2022      $special_chars = array( '?', '[', ']', '/', '\\', '=', '<', '>', ':', ';', ',', "'", '"', '&', '$', '#', '*', '(', ')', '|', '~', '`', '!', '{', '}', '%', '+', '’', '«', '»', '”', '“', chr( 0 ) );
2023  
2024      // Check for support for utf8 in the installed PCRE library once and store the result in a static.
2025      static $utf8_pcre = null;
2026      if ( ! isset( $utf8_pcre ) ) {
2027          // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged
2028          $utf8_pcre = @preg_match( '/^./u', 'a' );
2029      }
2030  
2031      if ( ! seems_utf8( $filename ) ) {
2032          $_ext     = pathinfo( $filename, PATHINFO_EXTENSION );
2033          $_name    = pathinfo( $filename, PATHINFO_FILENAME );
2034          $filename = sanitize_title_with_dashes( $_name ) . '.' . $_ext;
2035      }
2036  
2037      if ( $utf8_pcre ) {
2038          /**
2039           * Replace all whitespace characters with a basic space (U+0020).
2040           *
2041           * The “Zs” in the pattern selects characters in the `Space_Separator`
2042           * category, which is what Unicode considers space characters.
2043           *
2044           * @see https://www.unicode.org/reports/tr44/#General_Category_Values
2045           * @see https://www.unicode.org/versions/Unicode16.0.0/core-spec/chapter-6/#G17548
2046           * @see https://www.php.net/manual/en/regexp.reference.unicode.php
2047           */
2048          $filename = preg_replace( '#\p{Zs}#siu', ' ', $filename );
2049      }
2050  
2051      /**
2052       * Filters the list of characters to remove from a filename.
2053       *
2054       * @since 2.8.0
2055       *
2056       * @param string[] $special_chars Array of characters to remove.
2057       * @param string   $filename_raw  The original filename to be sanitized.
2058       */
2059      $special_chars = apply_filters( 'sanitize_file_name_chars', $special_chars, $filename_raw );
2060  
2061      $filename = str_replace( $special_chars, '', $filename );
2062      $filename = str_replace( array( '%20', '+' ), '-', $filename );
2063      $filename = preg_replace( '/\.{2,}/', '.', $filename );
2064      $filename = preg_replace( '/[\r\n\t -]+/', '-', $filename );
2065      $filename = trim( $filename, '.-_' );
2066  
2067      if ( ! str_contains( $filename, '.' ) ) {
2068          $mime_types = wp_get_mime_types();
2069          $filetype   = wp_check_filetype( 'test.' . $filename, $mime_types );
2070          if ( $filetype['ext'] === $filename ) {
2071              $filename = 'unnamed-file.' . $filetype['ext'];
2072          }
2073      }
2074  
2075      // Split the filename into a base and extension[s].
2076      $parts = explode( '.', $filename );
2077  
2078      // Return if only one extension.
2079      if ( count( $parts ) <= 2 ) {
2080          /** This filter is documented in wp-includes/formatting.php */
2081          return apply_filters( 'sanitize_file_name', $filename, $filename_raw );
2082      }
2083  
2084      // Process multiple extensions.
2085      $filename  = array_shift( $parts );
2086      $extension = array_pop( $parts );
2087      $mimes     = get_allowed_mime_types();
2088  
2089      /*
2090       * Loop over any intermediate extensions. Postfix them with a trailing underscore
2091       * if they are a 2 - 5 character long alpha string not in the allowed extension list.
2092       */
2093      foreach ( (array) $parts as $part ) {
2094          $filename .= '.' . $part;
2095  
2096          if ( preg_match( '/^[a-zA-Z]{2,5}\d?$/', $part ) ) {
2097              $allowed = false;
2098              foreach ( $mimes as $ext_preg => $mime_match ) {
2099                  $ext_preg = '!^(' . $ext_preg . ')$!i';
2100                  if ( preg_match( $ext_preg, $part ) ) {
2101                      $allowed = true;
2102                      break;
2103                  }
2104              }
2105              if ( ! $allowed ) {
2106                  $filename .= '_';
2107              }
2108          }
2109      }
2110  
2111      $filename .= '.' . $extension;
2112  
2113      /**
2114       * Filters a sanitized filename string.
2115       *
2116       * @since 2.8.0
2117       *
2118       * @param string $filename     Sanitized filename.
2119       * @param string $filename_raw The filename prior to sanitization.
2120       */
2121      return apply_filters( 'sanitize_file_name', $filename, $filename_raw );
2122  }
2123  
2124  /**
2125   * Sanitizes a username, stripping out unsafe characters.
2126   *
2127   * Removes tags, percent-encoded characters, HTML entities, and if strict is enabled,
2128   * will only keep alphanumeric, _, space, ., -, @. After sanitizing, it passes the username,
2129   * raw username (the username in the parameter), and the value of $strict as parameters
2130   * for the {@see 'sanitize_user'} filter.
2131   *
2132   * @since 2.0.0
2133   *
2134   * @param string $username The username to be sanitized.
2135   * @param bool   $strict   Optional. If set to true, limits $username to specific characters.
2136   *                         Default false.
2137   * @return string The sanitized username, after passing through filters.
2138   */
2139  function sanitize_user( $username, $strict = false ) {
2140      $raw_username = $username;
2141      $username     = wp_strip_all_tags( $username );
2142      $username     = remove_accents( $username );
2143      // Remove percent-encoded characters.
2144      $username = preg_replace( '|%([a-fA-F0-9][a-fA-F0-9])|', '', $username );
2145      // Remove HTML entities.
2146      $username = preg_replace( '/&.+?;/', '', $username );
2147  
2148      // If strict, reduce to ASCII for max portability.
2149      if ( $strict ) {
2150          $username = preg_replace( '|[^a-z0-9 _.\-@]|i', '', $username );
2151      }
2152  
2153      $username = trim( $username );
2154      // Consolidate contiguous whitespace.
2155      $username = preg_replace( '|\s+|', ' ', $username );
2156  
2157      /**
2158       * Filters a sanitized username string.
2159       *
2160       * @since 2.0.1
2161       *
2162       * @param string $username     Sanitized username.
2163       * @param string $raw_username The username prior to sanitization.
2164       * @param bool   $strict       Whether to limit the sanitization to specific characters.
2165       */
2166      return apply_filters( 'sanitize_user', $username, $raw_username, $strict );
2167  }
2168  
2169  /**
2170   * Sanitizes a string key.
2171   *
2172   * Keys are used as internal identifiers. Lowercase alphanumeric characters,
2173   * dashes, and underscores are allowed.
2174   *
2175   * @since 3.0.0
2176   *
2177   * @param string $key String key.
2178   * @return string Sanitized key.
2179   */
2180  function sanitize_key( $key ) {
2181      $sanitized_key = '';
2182  
2183      if ( is_scalar( $key ) ) {
2184          $sanitized_key = strtolower( $key );
2185          $sanitized_key = preg_replace( '/[^a-z0-9_\-]/', '', $sanitized_key );
2186      }
2187  
2188      /**
2189       * Filters a sanitized key string.
2190       *
2191       * @since 3.0.0
2192       *
2193       * @param string $sanitized_key Sanitized key.
2194       * @param string $key           The key prior to sanitization.
2195       */
2196      return apply_filters( 'sanitize_key', $sanitized_key, $key );
2197  }
2198  
2199  /**
2200   * Sanitizes a string into a slug, which can be used in URLs or HTML attributes.
2201   *
2202   * By default, converts accent characters to ASCII characters and further
2203   * limits the output to alphanumeric characters, underscore (_) and dash (-)
2204   * through the {@see 'sanitize_title'} filter.
2205   *
2206   * If `$title` is empty and `$fallback_title` is set, the latter will be used.
2207   *
2208   * @since 1.0.0
2209   *
2210   * @param string $title          The string to be sanitized.
2211   * @param string $fallback_title Optional. A title to use if $title is empty. Default empty.
2212   * @param string $context        Optional. The operation for which the string is sanitized.
2213   *                               When set to 'save', the string runs through remove_accents().
2214   *                               Default 'save'.
2215   * @return string The sanitized string.
2216   */
2217  function sanitize_title( $title, $fallback_title = '', $context = 'save' ) {
2218      $raw_title = $title;
2219  
2220      if ( 'save' === $context ) {
2221          $title = remove_accents( $title );
2222      }
2223  
2224      /**
2225       * Filters a sanitized title string.
2226       *
2227       * @since 1.2.0
2228       *
2229       * @param string $title     Sanitized title.
2230       * @param string $raw_title The title prior to sanitization.
2231       * @param string $context   The context for which the title is being sanitized.
2232       */
2233      $title = apply_filters( 'sanitize_title', $title, $raw_title, $context );
2234  
2235      if ( '' === $title || false === $title ) {
2236          $title = $fallback_title;
2237      }
2238  
2239      return $title;
2240  }
2241  
2242  /**
2243   * Sanitizes a title with the 'query' context.
2244   *
2245   * Used for querying the database for a value from URL.
2246   *
2247   * @since 3.1.0
2248   *
2249   * @param string $title The string to be sanitized.
2250   * @return string The sanitized string.
2251   */
2252  function sanitize_title_for_query( $title ) {
2253      return sanitize_title( $title, '', 'query' );
2254  }
2255  
2256  /**
2257   * Sanitizes a title, replacing whitespace and a few other characters with dashes.
2258   *
2259   * Limits the output to alphanumeric characters, underscore (_) and dash (-).
2260   * Whitespace becomes a dash.
2261   *
2262   * @since 1.2.0
2263   *
2264   * @param string $title     The title to be sanitized.
2265   * @param string $raw_title Optional. Not used. Default empty.
2266   * @param string $context   Optional. The operation for which the string is sanitized.
2267   *                          When set to 'save', additional entities are converted to hyphens
2268   *                          or stripped entirely. Default 'display'.
2269   * @return string The sanitized title.
2270   */
2271  function sanitize_title_with_dashes( $title, $raw_title = '', $context = 'display' ) {
2272      $title = strip_tags( $title );
2273      // Preserve escaped octets.
2274      $title = preg_replace( '|%([a-fA-F0-9][a-fA-F0-9])|', '---$1---', $title );
2275      // Remove percent signs that are not part of an octet.
2276      $title = str_replace( '%', '', $title );
2277      // Restore octets.
2278      $title = preg_replace( '|---([a-fA-F0-9][a-fA-F0-9])---|', '%$1', $title );
2279  
2280      if ( seems_utf8( $title ) ) {
2281          if ( function_exists( 'mb_strtolower' ) ) {
2282              $title = mb_strtolower( $title, 'UTF-8' );
2283          }
2284          $title = utf8_uri_encode( $title, 200 );
2285      }
2286  
2287      $title = strtolower( $title );
2288  
2289      if ( 'save' === $context ) {
2290          // Convert &nbsp, &ndash, and &mdash to hyphens.
2291          $title = str_replace( array( '%c2%a0', '%e2%80%93', '%e2%80%94' ), '-', $title );
2292          // Convert &nbsp, &ndash, and &mdash HTML entities to hyphens.
2293          $title = str_replace( array( '&nbsp;', '&#160;', '&ndash;', '&#8211;', '&mdash;', '&#8212;' ), '-', $title );
2294          // Convert forward slash to hyphen.
2295          $title = str_replace( '/', '-', $title );
2296  
2297          // Strip these characters entirely.
2298          $title = str_replace(
2299              array(
2300                  // Soft hyphens.
2301                  '%c2%ad',
2302                  // &iexcl and &iquest.
2303                  '%c2%a1',
2304                  '%c2%bf',
2305                  // Angle quotes.
2306                  '%c2%ab',
2307                  '%c2%bb',
2308                  '%e2%80%b9',
2309                  '%e2%80%ba',
2310                  // Curly quotes.
2311                  '%e2%80%98',
2312                  '%e2%80%99',
2313                  '%e2%80%9c',
2314                  '%e2%80%9d',
2315                  '%e2%80%9a',
2316                  '%e2%80%9b',
2317                  '%e2%80%9e',
2318                  '%e2%80%9f',
2319                  // Bullet.
2320                  '%e2%80%a2',
2321                  // &copy, &reg, &deg, &hellip, and &trade.
2322                  '%c2%a9',
2323                  '%c2%ae',
2324                  '%c2%b0',
2325                  '%e2%80%a6',
2326                  '%e2%84%a2',
2327                  // Acute accents.
2328                  '%c2%b4',
2329                  '%cb%8a',
2330                  '%cc%81',
2331                  '%cd%81',
2332                  // Grave accent, macron, caron.
2333                  '%cc%80',
2334                  '%cc%84',
2335                  '%cc%8c',
2336                  // Non-visible characters that display without a width.
2337                  '%e2%80%8b', // Zero width space.
2338                  '%e2%80%8c', // Zero width non-joiner.
2339                  '%e2%80%8d', // Zero width joiner.
2340                  '%e2%80%8e', // Left-to-right mark.
2341                  '%e2%80%8f', // Right-to-left mark.
2342                  '%e2%80%aa', // Left-to-right embedding.
2343                  '%e2%80%ab', // Right-to-left embedding.
2344                  '%e2%80%ac', // Pop directional formatting.
2345                  '%e2%80%ad', // Left-to-right override.
2346                  '%e2%80%ae', // Right-to-left override.
2347                  '%ef%bb%bf', // Byte order mark.
2348                  '%ef%bf%bc', // Object replacement character.
2349              ),
2350              '',
2351              $title
2352          );
2353  
2354          // Convert non-visible characters that display with a width to hyphen.
2355          $title = str_replace(
2356              array(
2357                  '%e2%80%80', // En quad.
2358                  '%e2%80%81', // Em quad.
2359                  '%e2%80%82', // En space.
2360                  '%e2%80%83', // Em space.
2361                  '%e2%80%84', // Three-per-em space.
2362                  '%e2%80%85', // Four-per-em space.
2363                  '%e2%80%86', // Six-per-em space.
2364                  '%e2%80%87', // Figure space.
2365                  '%e2%80%88', // Punctuation space.
2366                  '%e2%80%89', // Thin space.
2367                  '%e2%80%8a', // Hair space.
2368                  '%e2%80%a8', // Line separator.
2369                  '%e2%80%a9', // Paragraph separator.
2370                  '%e2%80%af', // Narrow no-break space.
2371              ),
2372              '-',
2373              $title
2374          );
2375  
2376          // Convert &times to 'x'.
2377          $title = str_replace( '%c3%97', 'x', $title );
2378      }
2379  
2380      // Remove HTML entities.
2381      $title = preg_replace( '/&.+?;/', '', $title );
2382      $title = str_replace( '.', '-', $title );
2383  
2384      $title = preg_replace( '/[^%a-z0-9 _-]/', '', $title );
2385      $title = preg_replace( '/\s+/', '-', $title );
2386      $title = preg_replace( '|-+|', '-', $title );
2387      $title = trim( $title, '-' );
2388  
2389      return $title;
2390  }
2391  
2392  /**
2393   * Ensures a string is a valid SQL 'order by' clause.
2394   *
2395   * Accepts one or more columns, with or without a sort order (ASC / DESC).
2396   * e.g. 'column_1', 'column_1, column_2', 'column_1 ASC, column_2 DESC' etc.
2397   *
2398   * Also accepts 'RAND()'.
2399   *
2400   * @since 2.5.1
2401   *
2402   * @param string $orderby Order by clause to be validated.
2403   * @return string|false Returns $orderby if valid, false otherwise.
2404   */
2405  function sanitize_sql_orderby( $orderby ) {
2406      if ( preg_match( '/^\s*(([a-z0-9_]+|`[a-z0-9_]+`)(\s+(ASC|DESC))?\s*(,\s*(?=[a-z0-9_`])|$))+$/i', $orderby ) || preg_match( '/^\s*RAND\(\s*\)\s*$/i', $orderby ) ) {
2407          return $orderby;
2408      }
2409      return false;
2410  }
2411  
2412  /**
2413   * Sanitizes an HTML classname to ensure it only contains valid characters.
2414   *
2415   * Strips the string down to A-Z,a-z,0-9,_,-. If this results in an empty
2416   * string then it will return the alternative value supplied.
2417   *
2418   * @todo Expand to support the full range of CDATA that a class attribute can contain.
2419   *
2420   * @since 2.8.0
2421   *
2422   * @param string $classname The classname to be sanitized.
2423   * @param string $fallback  Optional. The value to return if the sanitization ends up as an empty string.
2424   *                          Default empty string.
2425   * @return string The sanitized value.
2426   */
2427  function sanitize_html_class( $classname, $fallback = '' ) {
2428      // Strip out any percent-encoded characters.
2429      $sanitized = preg_replace( '|%[a-fA-F0-9][a-fA-F0-9]|', '', $classname );
2430  
2431      // Limit to A-Z, a-z, 0-9, '_', '-'.
2432      $sanitized = preg_replace( '/[^A-Za-z0-9_-]/', '', $sanitized );
2433  
2434      if ( '' === $sanitized && $fallback ) {
2435          return sanitize_html_class( $fallback );
2436      }
2437      /**
2438       * Filters a sanitized HTML class string.
2439       *
2440       * @since 2.8.0
2441       *
2442       * @param string $sanitized The sanitized HTML class.
2443       * @param string $classname HTML class before sanitization.
2444       * @param string $fallback  The fallback string.
2445       */
2446      return apply_filters( 'sanitize_html_class', $sanitized, $classname, $fallback );
2447  }
2448  
2449  /**
2450   * Strips out all characters not allowed in a locale name.
2451   *
2452   * @since 6.2.1
2453   *
2454   * @param string $locale_name The locale name to be sanitized.
2455   * @return string The sanitized value.
2456   */
2457  function sanitize_locale_name( $locale_name ) {
2458      // Limit to A-Z, a-z, 0-9, '_', '-'.
2459      $sanitized = preg_replace( '/[^A-Za-z0-9_-]/', '', $locale_name );
2460  
2461      /**
2462       * Filters a sanitized locale name string.
2463       *
2464       * @since 6.2.1
2465       *
2466       * @param string $sanitized   The sanitized locale name.
2467       * @param string $locale_name The locale name before sanitization.
2468       */
2469      return apply_filters( 'sanitize_locale_name', $sanitized, $locale_name );
2470  }
2471  
2472  /**
2473   * Converts lone & characters into `&#038;` (a.k.a. `&amp;`)
2474   *
2475   * @since 0.71
2476   *
2477   * @param string $content    String of characters to be converted.
2478   * @param string $deprecated Not used.
2479   * @return string Converted string.
2480   */
2481  function convert_chars( $content, $deprecated = '' ) {
2482      if ( ! empty( $deprecated ) ) {
2483          _deprecated_argument( __FUNCTION__, '0.71' );
2484      }
2485  
2486      if ( str_contains( $content, '&' ) ) {
2487          $content = preg_replace( '/&([^#])(?![a-z1-4]{1,8};)/i', '&#038;$1', $content );
2488      }
2489  
2490      return $content;
2491  }
2492  
2493  /**
2494   * Converts invalid Unicode references range to valid range.
2495   *
2496   * @since 4.3.0
2497   *
2498   * @param string $content String with entities that need converting.
2499   * @return string Converted string.
2500   */
2501  function convert_invalid_entities( $content ) {
2502      $wp_htmltranswinuni = array(
2503          '&#128;' => '&#8364;', // The Euro sign.
2504          '&#129;' => '',
2505          '&#130;' => '&#8218;', // These are Windows CP1252 specific characters.
2506          '&#131;' => '&#402;',  // They would look weird on non-Windows browsers.
2507          '&#132;' => '&#8222;',
2508          '&#133;' => '&#8230;',
2509          '&#134;' => '&#8224;',
2510          '&#135;' => '&#8225;',
2511          '&#136;' => '&#710;',
2512          '&#137;' => '&#8240;',
2513          '&#138;' => '&#352;',
2514          '&#139;' => '&#8249;',
2515          '&#140;' => '&#338;',
2516          '&#141;' => '',
2517          '&#142;' => '&#381;',
2518          '&#143;' => '',
2519          '&#144;' => '',
2520          '&#145;' => '&#8216;',
2521          '&#146;' => '&#8217;',
2522          '&#147;' => '&#8220;',
2523          '&#148;' => '&#8221;',
2524          '&#149;' => '&#8226;',
2525          '&#150;' => '&#8211;',
2526          '&#151;' => '&#8212;',
2527          '&#152;' => '&#732;',
2528          '&#153;' => '&#8482;',
2529          '&#154;' => '&#353;',
2530          '&#155;' => '&#8250;',
2531          '&#156;' => '&#339;',
2532          '&#157;' => '',
2533          '&#158;' => '&#382;',
2534          '&#159;' => '&#376;',
2535      );
2536  
2537      if ( str_contains( $content, '&#1' ) ) {
2538          $content = strtr( $content, $wp_htmltranswinuni );
2539      }
2540  
2541      return $content;
2542  }
2543  
2544  /**
2545   * Balances tags if forced to, or if the 'use_balanceTags' option is set to true.
2546   *
2547   * @since 0.71
2548   *
2549   * @param string $text  Text to be balanced.
2550   * @param bool   $force If true, forces balancing, ignoring the value of the option. Default false.
2551   * @return string Balanced text.
2552   */
2553  function balanceTags( $text, $force = false ) {  // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.FunctionNameInvalid
2554      if ( $force || (int) get_option( 'use_balanceTags' ) === 1 ) {
2555          return force_balance_tags( $text );
2556      } else {
2557          return $text;
2558      }
2559  }
2560  
2561  /**
2562   * Balances tags of string using a modified stack.
2563   *
2564   * {@internal Modified by Scott Reilly (coffee2code) 02 Aug 2004
2565   *      1.1  Fixed handling of append/stack pop order of end text
2566   *           Added Cleaning Hooks
2567   *      1.0  First Version}
2568   *
2569   * @since 2.0.4
2570   * @since 5.3.0 Improve accuracy and add support for custom element tags.
2571   *
2572   * @author Leonard Lin <leonard@acm.org>
2573   * @license GPL
2574   * @copyright November 4, 2001
2575   * @version 1.1
2576   * @todo Make better - change loop condition to $text in 1.2
2577   *
2578   * @param string $text Text to be balanced.
2579   * @return string Balanced text.
2580   */
2581  function force_balance_tags( $text ) {
2582      $tagstack  = array();
2583      $stacksize = 0;
2584      $tagqueue  = '';
2585      $newtext   = '';
2586      // Known single-entity/self-closing tags.
2587      $single_tags = array( 'area', 'base', 'basefont', 'br', 'col', 'command', 'embed', 'frame', 'hr', 'img', 'input', 'isindex', 'link', 'meta', 'param', 'source', 'track', 'wbr' );
2588      // Tags that can be immediately nested within themselves.
2589      $nestable_tags = array( 'article', 'aside', 'blockquote', 'details', 'div', 'figure', 'object', 'q', 'section', 'span' );
2590  
2591      // WP bug fix for comments - in case you REALLY meant to type '< !--'.
2592      $text = str_replace( '< !--', '<    !--', $text );
2593      // WP bug fix for LOVE <3 (and other situations with '<' before a number).
2594      $text = preg_replace( '#<([0-9]{1})#', '&lt;$1', $text );
2595  
2596      /**
2597       * Matches supported tags.
2598       *
2599       * To get the pattern as a string without the comments paste into a PHP
2600       * REPL like `php -a`.
2601       *
2602       * @see https://html.spec.whatwg.org/#elements-2
2603       * @see https://html.spec.whatwg.org/multipage/custom-elements.html#valid-custom-element-name
2604       *
2605       * @example
2606       * ~# php -a
2607       * php > $s = [paste copied contents of expression below including parentheses];
2608       * php > echo $s;
2609       */
2610      $tag_pattern = (
2611          '#<' . // Start with an opening bracket.
2612          '(/?)' . // Group 1 - If it's a closing tag it'll have a leading slash.
2613          '(' . // Group 2 - Tag name.
2614              // Custom element tags have more lenient rules than HTML tag names.
2615              '(?:[a-z](?:[a-z0-9._]*)-(?:[a-z0-9._-]+)+)' .
2616                  '|' .
2617              // Traditional tag rules approximate HTML tag names.
2618              '(?:[\w:]+)' .
2619          ')' .
2620          '(?:' .
2621              // We either immediately close the tag with its '>' and have nothing here.
2622              '\s*' .
2623              '(/?)' . // Group 3 - "attributes" for empty tag.
2624                  '|' .
2625              // Or we must start with space characters to separate the tag name from the attributes (or whitespace).
2626              '(\s+)' . // Group 4 - Pre-attribute whitespace.
2627              '([^>]*)' . // Group 5 - Attributes.
2628          ')' .
2629          '>#' // End with a closing bracket.
2630      );
2631  
2632      while ( preg_match( $tag_pattern, $text, $regex ) ) {
2633          $full_match        = $regex[0];
2634          $has_leading_slash = ! empty( $regex[1] );
2635          $tag_name          = $regex[2];
2636          $tag               = strtolower( $tag_name );
2637          $is_single_tag     = in_array( $tag, $single_tags, true );
2638          $pre_attribute_ws  = isset( $regex[4] ) ? $regex[4] : '';
2639          $attributes        = trim( isset( $regex[5] ) ? $regex[5] : $regex[3] );
2640          $has_self_closer   = str_ends_with( $attributes, '/' );
2641  
2642          $newtext .= $tagqueue;
2643  
2644          $i = strpos( $text, $full_match );
2645          $l = strlen( $full_match );
2646  
2647          // Clear the shifter.
2648          $tagqueue = '';
2649          if ( $has_leading_slash ) { // End tag.
2650              // If too many closing tags.
2651              if ( $stacksize <= 0 ) {
2652                  $tag = '';
2653                  // Or close to be safe $tag = '/' . $tag.
2654  
2655                  // If stacktop value = tag close value, then pop.
2656              } elseif ( $tagstack[ $stacksize - 1 ] === $tag ) { // Found closing tag.
2657                  $tag = '</' . $tag . '>'; // Close tag.
2658                  array_pop( $tagstack );
2659                  --$stacksize;
2660              } else { // Closing tag not at top, search for it.
2661                  for ( $j = $stacksize - 1; $j >= 0; $j-- ) {
2662                      if ( $tagstack[ $j ] === $tag ) {
2663                          // Add tag to tagqueue.
2664                          for ( $k = $stacksize - 1; $k >= $j; $k-- ) {
2665                              $tagqueue .= '</' . array_pop( $tagstack ) . '>';
2666                              --$stacksize;
2667                          }
2668                          break;
2669                      }
2670                  }
2671                  $tag = '';
2672              }
2673          } else { // Begin tag.
2674              if ( $has_self_closer ) {
2675                  /*
2676                   * If it presents itself as a self-closing tag, but it isn't a known single-entity self-closing tag,
2677                   * then don't let it be treated as such and immediately close it with a closing tag.
2678                   * The tag will encapsulate no text as a result.
2679                   */
2680                  if ( ! $is_single_tag ) {
2681                      $attributes = trim( substr( $attributes, 0, -1 ) ) . "></$tag";
2682                  }
2683              } elseif ( $is_single_tag ) {
2684                  // Else if it's a known single-entity tag but it doesn't close itself, do so.
2685                  $pre_attribute_ws = ' ';
2686                  $attributes      .= '/';
2687              } else {
2688                  /*
2689                   * It's not a single-entity tag.
2690                   * If the top of the stack is the same as the tag we want to push, close previous tag.
2691                   */
2692                  if ( $stacksize > 0 && ! in_array( $tag, $nestable_tags, true ) && $tagstack[ $stacksize - 1 ] === $tag ) {
2693                      $tagqueue = '</' . array_pop( $tagstack ) . '>';
2694                      --$stacksize;
2695                  }
2696                  $stacksize = array_push( $tagstack, $tag );
2697              }
2698  
2699              // Attributes.
2700              if ( $has_self_closer && $is_single_tag ) {
2701                  // We need some space - avoid <br/> and prefer <br />.
2702                  $pre_attribute_ws = ' ';
2703              }
2704  
2705              $tag = '<' . $tag . $pre_attribute_ws . $attributes . '>';
2706              // If already queuing a close tag, then put this tag on too.
2707              if ( ! empty( $tagqueue ) ) {
2708                  $tagqueue .= $tag;
2709                  $tag       = '';
2710              }
2711          }
2712          $newtext .= substr( $text, 0, $i ) . $tag;
2713          $text     = substr( $text, $i + $l );
2714      }
2715  
2716      // Clear tag queue.
2717      $newtext .= $tagqueue;
2718  
2719      // Add remaining text.
2720      $newtext .= $text;
2721  
2722      while ( $x = array_pop( $tagstack ) ) {
2723          $newtext .= '</' . $x . '>'; // Add remaining tags to close.
2724      }
2725  
2726      // WP fix for the bug with HTML comments.
2727      $newtext = str_replace( '< !--', '<!--', $newtext );
2728      $newtext = str_replace( '<    !--', '< !--', $newtext );
2729  
2730      return $newtext;
2731  }
2732  
2733  /**
2734   * Acts on text which is about to be edited.
2735   *
2736   * The $content is run through esc_textarea(), which uses htmlspecialchars()
2737   * to convert special characters to HTML entities. If `$richedit` is set to true,
2738   * it is simply a holder for the {@see 'format_to_edit'} filter.
2739   *
2740   * @since 0.71
2741   * @since 4.4.0 The `$richedit` parameter was renamed to `$rich_text` for clarity.
2742   *
2743   * @param string $content   The text about to be edited.
2744   * @param bool   $rich_text Optional. Whether `$content` should be considered rich text,
2745   *                          in which case it would not be passed through esc_textarea().
2746   *                          Default false.
2747   * @return string The text after the filter (and possibly htmlspecialchars()) has been run.
2748   */
2749  function format_to_edit( $content, $rich_text = false ) {
2750      /**
2751       * Filters the text to be formatted for editing.
2752       *
2753       * @since 1.2.0
2754       *
2755       * @param string $content The text, prior to formatting for editing.
2756       */
2757      $content = apply_filters( 'format_to_edit', $content );
2758      if ( ! $rich_text ) {
2759          $content = esc_textarea( $content );
2760      }
2761      return $content;
2762  }
2763  
2764  /**
2765   * Add leading zeros when necessary.
2766   *
2767   * If you set the threshold to '4' and the number is '10', then you will get
2768   * back '0010'. If you set the threshold to '4' and the number is '5000', then you
2769   * will get back '5000'.
2770   *
2771   * Uses sprintf to append the amount of zeros based on the $threshold parameter
2772   * and the size of the number. If the number is large enough, then no zeros will
2773   * be appended.
2774   *
2775   * @since 0.71
2776   *
2777   * @param int $number     Number to append zeros to if not greater than threshold.
2778   * @param int $threshold  Digit places number needs to be to not have zeros added.
2779   * @return string Adds leading zeros to number if needed.
2780   */
2781  function zeroise( $number, $threshold ) {
2782      return sprintf( '%0' . $threshold . 's', $number );
2783  }
2784  
2785  /**
2786   * Adds backslashes before letters and before a number at the start of a string.
2787   *
2788   * @since 0.71
2789   *
2790   * @param string $value Value to which backslashes will be added.
2791   * @return string String with backslashes inserted.
2792   */
2793  function backslashit( $value ) {
2794      if ( isset( $value[0] ) && $value[0] >= '0' && $value[0] <= '9' ) {
2795          $value = '\\\\' . $value;
2796      }
2797      return addcslashes( $value, 'A..Za..z' );
2798  }
2799  
2800  /**
2801   * Appends a trailing slash.
2802   *
2803   * Will remove trailing forward and backslashes if it exists already before adding
2804   * a trailing forward slash. This prevents double slashing a string or path.
2805   *
2806   * The primary use of this is for paths and thus should be used for paths. It is
2807   * not restricted to paths and offers no specific path support.
2808   *
2809   * @since 1.2.0
2810   *
2811   * @param string $value Value to which trailing slash will be added.
2812   * @return string String with trailing slash added.
2813   */
2814  function trailingslashit( $value ) {
2815      return untrailingslashit( $value ) . '/';
2816  }
2817  
2818  /**
2819   * Removes trailing forward slashes and backslashes if they exist.
2820   *
2821   * The primary use of this is for paths and thus should be used for paths. It is
2822   * not restricted to paths and offers no specific path support.
2823   *
2824   * @since 2.2.0
2825   *
2826   * @param string $value Value from which trailing slashes will be removed.
2827   * @return string String without the trailing slashes.
2828   */
2829  function untrailingslashit( $value ) {
2830      return rtrim( $value, '/\\' );
2831  }
2832  
2833  /**
2834   * Adds slashes to a string or recursively adds slashes to strings within an array.
2835   *
2836   * @since 0.71
2837   *
2838   * @param string|array $gpc String or array of data to slash.
2839   * @return string|array Slashed `$gpc`.
2840   */
2841  function addslashes_gpc( $gpc ) {
2842      return wp_slash( $gpc );
2843  }
2844  
2845  /**
2846   * Navigates through an array, object, or scalar, and removes slashes from the values.
2847   *
2848   * @since 2.0.0
2849   *
2850   * @param mixed $value The value to be stripped.
2851   * @return mixed Stripped value.
2852   */
2853  function stripslashes_deep( $value ) {
2854      return map_deep( $value, 'stripslashes_from_strings_only' );
2855  }
2856  
2857  /**
2858   * Callback function for `stripslashes_deep()` which strips slashes from strings.
2859   *
2860   * @since 4.4.0
2861   *
2862   * @param mixed $value The array or string to be stripped.
2863   * @return mixed The stripped value.
2864   */
2865  function stripslashes_from_strings_only( $value ) {
2866      return is_string( $value ) ? stripslashes( $value ) : $value;
2867  }
2868  
2869  /**
2870   * Navigates through an array, object, or scalar, and encodes the values to be used in a URL.
2871   *
2872   * @since 2.2.0
2873   *
2874   * @param mixed $value The array or string to be encoded.
2875   * @return mixed The encoded value.
2876   */
2877  function urlencode_deep( $value ) {
2878      return map_deep( $value, 'urlencode' );
2879  }
2880  
2881  /**
2882   * Navigates through an array, object, or scalar, and raw-encodes the values to be used in a URL.
2883   *
2884   * @since 3.4.0
2885   *
2886   * @param mixed $value The array or string to be encoded.
2887   * @return mixed The encoded value.
2888   */
2889  function rawurlencode_deep( $value ) {
2890      return map_deep( $value, 'rawurlencode' );
2891  }
2892  
2893  /**
2894   * Navigates through an array, object, or scalar, and decodes URL-encoded values
2895   *
2896   * @since 4.4.0
2897   *
2898   * @param mixed $value The array or string to be decoded.
2899   * @return mixed The decoded value.
2900   */
2901  function urldecode_deep( $value ) {
2902      return map_deep( $value, 'urldecode' );
2903  }
2904  
2905  /**
2906   * Converts email addresses characters to HTML entities to block spam bots.
2907   *
2908   * @since 0.71
2909   *
2910   * @param string $email_address Email address.
2911   * @param int    $hex_encoding  Optional. Set to 1 to enable hex encoding.
2912   * @return string Converted email address.
2913   */
2914  function antispambot( $email_address, $hex_encoding = 0 ) {
2915      $email_no_spam_address = '';
2916  
2917      for ( $i = 0, $len = strlen( $email_address ); $i < $len; $i++ ) {
2918          $j = rand( 0, 1 + $hex_encoding );
2919  
2920          if ( 0 === $j ) {
2921              $email_no_spam_address .= '&#' . ord( $email_address[ $i ] ) . ';';
2922          } elseif ( 1 === $j ) {
2923              $email_no_spam_address .= $email_address[ $i ];
2924          } elseif ( 2 === $j ) {
2925              $email_no_spam_address .= '%' . zeroise( dechex( ord( $email_address[ $i ] ) ), 2 );
2926          }
2927      }
2928  
2929      return str_replace( '@', '&#64;', $email_no_spam_address );
2930  }
2931  
2932  /**
2933   * Callback to convert URI match to HTML A element.
2934   *
2935   * This function was backported from 2.5.0 to 2.3.2. Regex callback for make_clickable().
2936   *
2937   * @since 2.3.2
2938   * @access private
2939   *
2940   * @param array $matches Single Regex Match.
2941   * @return string HTML A element with URI address.
2942   */
2943  function _make_url_clickable_cb( $matches ) {
2944      $url = $matches[2];
2945  
2946      if ( ')' === $matches[3] && strpos( $url, '(' ) ) {
2947          /*
2948           * If the trailing character is a closing parenthesis, and the URL has an opening parenthesis in it,
2949           * add the closing parenthesis to the URL. Then we can let the parenthesis balancer do its thing below.
2950           */
2951          $url   .= $matches[3];
2952          $suffix = '';
2953      } else {
2954          $suffix = $matches[3];
2955      }
2956  
2957      if ( isset( $matches[4] ) && ! empty( $matches[4] ) ) {
2958          $url .= $matches[4];
2959      }
2960  
2961      // Include parentheses in the URL only if paired.
2962      while ( substr_count( $url, '(' ) < substr_count( $url, ')' ) ) {
2963          $suffix = strrchr( $url, ')' ) . $suffix;
2964          $url    = substr( $url, 0, strrpos( $url, ')' ) );
2965      }
2966  
2967      $url = esc_url( $url );
2968      if ( empty( $url ) ) {
2969          return $matches[0];
2970      }
2971  
2972      $rel_attr = _make_clickable_rel_attr( $url );
2973  
2974      return $matches[1] . "<a href=\"{$url}\"{$rel_attr}>{$url}</a>" . $suffix;
2975  }
2976  
2977  /**
2978   * Callback to convert URL match to HTML A element.
2979   *
2980   * This function was backported from 2.5.0 to 2.3.2. Regex callback for make_clickable().
2981   *
2982   * @since 2.3.2
2983   * @access private
2984   *
2985   * @param array $matches Single Regex Match.
2986   * @return string HTML A element with URL address.
2987   */
2988  function _make_web_ftp_clickable_cb( $matches ) {
2989      $ret  = '';
2990      $dest = $matches[2];
2991      $dest = 'http://' . $dest;
2992  
2993      // Removed trailing [.,;:)] from URL.
2994      $last_char = substr( $dest, -1 );
2995      if ( in_array( $last_char, array( '.', ',', ';', ':', ')' ), true ) === true ) {
2996          $ret  = $last_char;
2997          $dest = substr( $dest, 0, strlen( $dest ) - 1 );
2998      }
2999  
3000      $dest = esc_url( $dest );
3001      if ( empty( $dest ) ) {
3002          return $matches[0];
3003      }
3004  
3005      $rel_attr = _make_clickable_rel_attr( $dest );
3006  
3007      return $matches[1] . "<a href=\"{$dest}\"{$rel_attr}>{$dest}</a>{$ret}";
3008  }
3009  
3010  /**
3011   * Callback to convert email address match to HTML A element.
3012   *
3013   * This function was backported from 2.5.0 to 2.3.2. Regex callback for make_clickable().
3014   *
3015   * @since 2.3.2
3016   * @access private
3017   *
3018   * @param array $matches Single Regex Match.
3019   * @return string HTML A element with email address.
3020   */
3021  function _make_email_clickable_cb( $matches ) {
3022      $email = $matches[2] . '@' . $matches[3];
3023  
3024      return $matches[1] . "<a href=\"mailto:{$email}\">{$email}</a>";
3025  }
3026  
3027  /**
3028   * Helper function used to build the "rel" attribute for a URL when creating an anchor using make_clickable().
3029   *
3030   * @since 6.2.0
3031   *
3032   * @param string $url The URL.
3033   * @return string The rel attribute for the anchor or an empty string if no rel attribute should be added.
3034   */
3035  function _make_clickable_rel_attr( $url ) {
3036      $rel_parts        = array();
3037      $scheme           = strtolower( wp_parse_url( $url, PHP_URL_SCHEME ) );
3038      $nofollow_schemes = array_intersect( wp_allowed_protocols(), array( 'https', 'http' ) );
3039  
3040      // Apply "nofollow" to external links with qualifying URL schemes (mailto:, tel:, etc... shouldn't be followed).
3041      if ( ! wp_is_internal_link( $url ) && in_array( $scheme, $nofollow_schemes, true ) ) {
3042          $rel_parts[] = 'nofollow';
3043      }
3044  
3045      // Apply "ugc" when in comment context.
3046      if ( 'comment_text' === current_filter() ) {
3047          $rel_parts[] = 'ugc';
3048      }
3049  
3050      $rel = implode( ' ', $rel_parts );
3051  
3052      /**
3053       * Filters the rel value that is added to URL matches converted to links.
3054       *
3055       * @since 5.3.0
3056       *
3057       * @param string $rel The rel value.
3058       * @param string $url The matched URL being converted to a link tag.
3059       */
3060      $rel = apply_filters( 'make_clickable_rel', $rel, $url );
3061  
3062      $rel_attr = $rel ? ' rel="' . esc_attr( $rel ) . '"' : '';
3063  
3064      return $rel_attr;
3065  }
3066  
3067  /**
3068   * Converts plaintext URI to HTML links.
3069   *
3070   * Converts URI, www and ftp, and email addresses. Finishes by fixing links
3071   * within links.
3072   *
3073   * @since 0.71
3074   *
3075   * @param string $text Content to convert URIs.
3076   * @return string Content with converted URIs.
3077   */
3078  function make_clickable( $text ) {
3079      $r               = '';
3080      $textarr         = preg_split( '/(<[^<>]+>)/', $text, -1, PREG_SPLIT_DELIM_CAPTURE ); // Split out HTML tags.
3081      $nested_code_pre = 0; // Keep track of how many levels link is nested inside <pre> or <code>.
3082      foreach ( $textarr as $piece ) {
3083  
3084          if ( preg_match( '|^<code[\s>]|i', $piece )
3085              || preg_match( '|^<pre[\s>]|i', $piece )
3086              || preg_match( '|^<script[\s>]|i', $piece )
3087              || preg_match( '|^<style[\s>]|i', $piece )
3088          ) {
3089              ++$nested_code_pre;
3090          } elseif ( $nested_code_pre
3091              && ( '</code>' === strtolower( $piece )
3092                  || '</pre>' === strtolower( $piece )
3093                  || '</script>' === strtolower( $piece )
3094                  || '</style>' === strtolower( $piece )
3095              )
3096          ) {
3097              --$nested_code_pre;
3098          }
3099  
3100          if ( $nested_code_pre
3101              || empty( $piece )
3102              || ( '<' === $piece[0] && ! preg_match( '|^<\s*[\w]{1,20}+://|', $piece ) )
3103          ) {
3104              $r .= $piece;
3105              continue;
3106          }
3107  
3108          // Long strings might contain expensive edge cases...
3109          if ( 10000 < strlen( $piece ) ) {
3110              // ...break it up.
3111              foreach ( _split_str_by_whitespace( $piece, 2100 ) as $chunk ) { // 2100: Extra room for scheme and leading and trailing parentheses.
3112                  if ( 2101 < strlen( $chunk ) ) {
3113                      $r .= $chunk; // Too big, no whitespace: bail.
3114                  } else {
3115                      $r .= make_clickable( $chunk );
3116                  }
3117              }
3118          } else {
3119              $ret = " $piece "; // Pad with whitespace to simplify the regexes.
3120  
3121              $url_clickable = '~
3122                  ([\\s(<.,;:!?])                                # 1: Leading whitespace, or punctuation.
3123                  (                                              # 2: URL.
3124                      [\\w]{1,20}+://                                # Scheme and hier-part prefix.
3125                      (?=\S{1,2000}\s)                               # Limit to URLs less than about 2000 characters long.
3126                      [\\w\\x80-\\xff#%\\~/@\\[\\]*(+=&$-]*+         # Non-punctuation URL character.
3127                      (?:                                            # Unroll the Loop: Only allow punctuation URL character if followed by a non-punctuation URL character.
3128                          [\'.,;:!?)]                                    # Punctuation URL character.
3129                          [\\w\\x80-\\xff#%\\~/@\\[\\]*(+=&$-]++         # Non-punctuation URL character.
3130                      )*
3131                  )
3132                  (\)?)                                          # 3: Trailing closing parenthesis (for parenthesis balancing post processing).
3133                  (\\.\\w{2,6})?                                 # 4: Allowing file extensions (e.g., .jpg, .png).
3134              ~xS';
3135              /*
3136               * The regex is a non-anchored pattern and does not have a single fixed starting character.
3137               * Tell PCRE to spend more time optimizing since, when used on a page load, it will probably be used several times.
3138               */
3139  
3140              $ret = preg_replace_callback( $url_clickable, '_make_url_clickable_cb', $ret );
3141  
3142              $ret = preg_replace_callback( '#([\s>])((www|ftp)\.[\w\\x80-\\xff\#$%&~/.\-;:=,?@\[\]+]+)#is', '_make_web_ftp_clickable_cb', $ret );
3143              $ret = preg_replace_callback( '#([\s>])([.0-9a-z_+-]+)@(([0-9a-z-]+\.)+[0-9a-z]{2,})#i', '_make_email_clickable_cb', $ret );
3144  
3145              $ret = substr( $ret, 1, -1 ); // Remove our whitespace padding.
3146              $r  .= $ret;
3147          }
3148      }
3149  
3150      // Cleanup of accidental links within links.
3151      return preg_replace( '#(<a([ \r\n\t]+[^>]+?>|>))<a [^>]+?>([^>]+?)</a></a>#i', '$1$3</a>', $r );
3152  }
3153  
3154  /**
3155   * Breaks a string into chunks by splitting at whitespace characters.
3156   *
3157   * The length of each returned chunk is as close to the specified length goal as possible,
3158   * with the caveat that each chunk includes its trailing delimiter.
3159   * Chunks longer than the goal are guaranteed to not have any inner whitespace.
3160   *
3161   * Joining the returned chunks with empty delimiters reconstructs the input string losslessly.
3162   *
3163   * Input string must have no null characters (or eventual transformations on output chunks must not care about null characters)
3164   *
3165   *     _split_str_by_whitespace( "1234 67890 1234 67890a cd 1234   890 123456789 1234567890a    45678   1 3 5 7 90 ", 10 ) ==
3166   *     array (
3167   *         0 => '1234 67890 ',  // 11 characters: Perfect split.
3168   *         1 => '1234 ',        //  5 characters: '1234 67890a' was too long.
3169   *         2 => '67890a cd ',   // 10 characters: '67890a cd 1234' was too long.
3170   *         3 => '1234   890 ',  // 11 characters: Perfect split.
3171   *         4 => '123456789 ',   // 10 characters: '123456789 1234567890a' was too long.
3172   *         5 => '1234567890a ', // 12 characters: Too long, but no inner whitespace on which to split.
3173   *         6 => '   45678   ',  // 11 characters: Perfect split.
3174   *         7 => '1 3 5 7 90 ',  // 11 characters: End of $text.
3175   *     );
3176   *
3177   * @since 3.4.0
3178   * @access private
3179   *
3180   * @param string $text   The string to split.
3181   * @param int    $goal   The desired chunk length.
3182   * @return array Numeric array of chunks.
3183   */
3184  function _split_str_by_whitespace( $text, $goal ) {
3185      $chunks = array();
3186  
3187      $string_nullspace = strtr( $text, "\r\n\t\v\f ", "\000\000\000\000\000\000" );
3188  
3189      while ( $goal < strlen( $string_nullspace ) ) {
3190          $pos = strrpos( substr( $string_nullspace, 0, $goal + 1 ), "\000" );
3191  
3192          if ( false === $pos ) {
3193              $pos = strpos( $string_nullspace, "\000", $goal + 1 );
3194              if ( false === $pos ) {
3195                  break;
3196              }
3197          }
3198  
3199          $chunks[]         = substr( $text, 0, $pos + 1 );
3200          $text             = substr( $text, $pos + 1 );
3201          $string_nullspace = substr( $string_nullspace, $pos + 1 );
3202      }
3203  
3204      if ( $text ) {
3205          $chunks[] = $text;
3206      }
3207  
3208      return $chunks;
3209  }
3210  
3211  /**
3212   * Callback to add a rel attribute to HTML A element.
3213   *
3214   * Will remove already existing string before adding to prevent invalidating (X)HTML.
3215   *
3216   * @since 5.3.0
3217   *
3218   * @param array  $matches Single match.
3219   * @param string $rel     The rel attribute to add.
3220   * @return string HTML A element with the added rel attribute.
3221   */
3222  function wp_rel_callback( $matches, $rel ) {
3223      $text = $matches[1];
3224      $atts = wp_kses_hair( $matches[1], wp_allowed_protocols() );
3225  
3226      if ( ! empty( $atts['href'] ) && wp_is_internal_link( $atts['href']['value'] ) ) {
3227          $rel = trim( str_replace( 'nofollow', '', $rel ) );
3228      }
3229  
3230      if ( ! empty( $atts['rel'] ) ) {
3231          $parts     = array_map( 'trim', explode( ' ', $atts['rel']['value'] ) );
3232          $rel_array = array_map( 'trim', explode( ' ', $rel ) );
3233          $parts     = array_unique( array_merge( $parts, $rel_array ) );
3234          $rel       = implode( ' ', $parts );
3235          unset( $atts['rel'] );
3236  
3237          $html = '';
3238          foreach ( $atts as $name => $value ) {
3239              if ( isset( $value['vless'] ) && 'y' === $value['vless'] ) {
3240                  $html .= $name . ' ';
3241              } else {
3242                  $html .= "{$name}=\"" . esc_attr( $value['value'] ) . '" ';
3243              }
3244          }
3245          $text = trim( $html );
3246      }
3247  
3248      $rel_attr = $rel ? ' rel="' . esc_attr( $rel ) . '"' : '';
3249  
3250      return "<a {$text}{$rel_attr}>";
3251  }
3252  
3253  /**
3254   * Adds `rel="nofollow"` string to all HTML A elements in content.
3255   *
3256   * @since 1.5.0
3257   *
3258   * @param string $text Content that may contain HTML A elements.
3259   * @return string Converted content.
3260   */
3261  function wp_rel_nofollow( $text ) {
3262      // This is a pre-save filter, so text is already escaped.
3263      $text = stripslashes( $text );
3264      $text = preg_replace_callback(
3265          '|<a (.+?)>|i',
3266          static function ( $matches ) {
3267              return wp_rel_callback( $matches, 'nofollow' );
3268          },
3269          $text
3270      );
3271      return wp_slash( $text );
3272  }
3273  
3274  /**
3275   * Callback to add `rel="nofollow"` string to HTML A element.
3276   *
3277   * @since 2.3.0
3278   * @deprecated 5.3.0 Use wp_rel_callback()
3279   *
3280   * @param array $matches Single match.
3281   * @return string HTML A Element with `rel="nofollow"`.
3282   */
3283  function wp_rel_nofollow_callback( $matches ) {
3284      return wp_rel_callback( $matches, 'nofollow' );
3285  }
3286  
3287  /**
3288   * Adds `rel="nofollow ugc"` string to all HTML A elements in content.
3289   *
3290   * @since 5.3.0
3291   *
3292   * @param string $text Content that may contain HTML A elements.
3293   * @return string Converted content.
3294   */
3295  function wp_rel_ugc( $text ) {
3296      // This is a pre-save filter, so text is already escaped.
3297      $text = stripslashes( $text );
3298      $text = preg_replace_callback(
3299          '|<a (.+?)>|i',
3300          static function ( $matches ) {
3301              return wp_rel_callback( $matches, 'nofollow ugc' );
3302          },
3303          $text
3304      );
3305      return wp_slash( $text );
3306  }
3307  
3308  /**
3309   * Adds `rel="noopener"` to all HTML A elements that have a target.
3310   *
3311   * @since 5.1.0
3312   * @since 5.6.0 Removed 'noreferrer' relationship.
3313   * @deprecated 6.7.0
3314   *
3315   * @param string $text Content that may contain HTML A elements.
3316   * @return string Converted content.
3317   */
3318  function wp_targeted_link_rel( $text ) {
3319      _deprecated_function( __FUNCTION__, '6.7.0' );
3320  
3321      // Don't run (more expensive) regex if no links with targets.
3322      if ( stripos( $text, 'target' ) === false || stripos( $text, '<a ' ) === false || is_serialized( $text ) ) {
3323          return $text;
3324      }
3325  
3326      $script_and_style_regex = '/<(script|style).*?<\/\\1>/si';
3327  
3328      preg_match_all( $script_and_style_regex, $text, $matches );
3329      $extra_parts = $matches[0];
3330      $html_parts  = preg_split( $script_and_style_regex, $text );
3331  
3332      foreach ( $html_parts as &$part ) {
3333          $part = preg_replace_callback( '|<a\s([^>]*target\s*=[^>]*)>|i', 'wp_targeted_link_rel_callback', $part );
3334      }
3335  
3336      $text = '';
3337      for ( $i = 0; $i < count( $html_parts ); $i++ ) {
3338          $text .= $html_parts[ $i ];
3339          if ( isset( $extra_parts[ $i ] ) ) {
3340              $text .= $extra_parts[ $i ];
3341          }
3342      }
3343  
3344      return $text;
3345  }
3346  
3347  /**
3348   * Callback to add `rel="noopener"` string to HTML A element.
3349   *
3350   * Will not duplicate an existing 'noopener' value to avoid invalidating the HTML.
3351   *
3352   * @since 5.1.0
3353   * @since 5.6.0 Removed 'noreferrer' relationship.
3354   * @deprecated 6.7.0
3355   *
3356   * @param array $matches Single match.
3357   * @return string HTML A Element with `rel="noopener"` in addition to any existing values.
3358   */
3359  function wp_targeted_link_rel_callback( $matches ) {
3360      _deprecated_function( __FUNCTION__, '6.7.0' );
3361  
3362      $link_html          = $matches[1];
3363      $original_link_html = $link_html;
3364  
3365      // Consider the HTML escaped if there are no unescaped quotes.
3366      $is_escaped = ! preg_match( '/(^|[^\\\\])[\'"]/', $link_html );
3367      if ( $is_escaped ) {
3368          // Replace only the quotes so that they are parsable by wp_kses_hair(), leave the rest as is.
3369          $link_html = preg_replace( '/\\\\([\'"])/', '$1', $link_html );
3370      }
3371  
3372      $atts = wp_kses_hair( $link_html, wp_allowed_protocols() );
3373  
3374      /**
3375       * Filters the rel values that are added to links with `target` attribute.
3376       *
3377       * @since 5.1.0
3378       *
3379       * @param string $rel       The rel values.
3380       * @param string $link_html The matched content of the link tag including all HTML attributes.
3381       */
3382      $rel = apply_filters( 'wp_targeted_link_rel', 'noopener', $link_html );
3383  
3384      // Return early if no rel values to be added or if no actual target attribute.
3385      if ( ! $rel || ! isset( $atts['target'] ) ) {
3386          return "<a $original_link_html>";
3387      }
3388  
3389      if ( isset( $atts['rel'] ) ) {
3390          $all_parts = preg_split( '/\s/', "{$atts['rel']['value']} $rel", -1, PREG_SPLIT_NO_EMPTY );
3391          $rel       = implode( ' ', array_unique( $all_parts ) );
3392      }
3393  
3394      $atts['rel']['whole'] = 'rel="' . esc_attr( $rel ) . '"';
3395      $link_html            = implode( ' ', array_column( $atts, 'whole' ) );
3396  
3397      if ( $is_escaped ) {
3398          $link_html = preg_replace( '/[\'"]/', '\\\\$0', $link_html );
3399      }
3400  
3401      return "<a $link_html>";
3402  }
3403  
3404  /**
3405   * Adds all filters modifying the rel attribute of targeted links.
3406   *
3407   * @since 5.1.0
3408   * @deprecated 6.7.0
3409   */
3410  function wp_init_targeted_link_rel_filters() {
3411      _deprecated_function( __FUNCTION__, '6.7.0' );
3412  }
3413  
3414  /**
3415   * Removes all filters modifying the rel attribute of targeted links.
3416   *
3417   * @since 5.1.0
3418   * @deprecated 6.7.0
3419   */
3420  function wp_remove_targeted_link_rel_filters() {
3421      _deprecated_function( __FUNCTION__, '6.7.0' );
3422  }
3423  
3424  /**
3425   * Converts one smiley code to the icon graphic file equivalent.
3426   *
3427   * Callback handler for convert_smilies().
3428   *
3429   * Looks up one smiley code in the $wpsmiliestrans global array and returns an
3430   * `<img>` string for that smiley.
3431   *
3432   * @since 2.8.0
3433   *
3434   * @global array $wpsmiliestrans
3435   *
3436   * @param array $matches Single match. Smiley code to convert to image.
3437   * @return string Image string for smiley.
3438   */
3439  function translate_smiley( $matches ) {
3440      global $wpsmiliestrans;
3441  
3442      if ( count( $matches ) === 0 ) {
3443          return '';
3444      }
3445  
3446      $smiley = trim( reset( $matches ) );
3447      $img    = $wpsmiliestrans[ $smiley ];
3448  
3449      $matches    = array();
3450      $ext        = preg_match( '/\.([^.]+)$/', $img, $matches ) ? strtolower( $matches[1] ) : false;
3451      $image_exts = array( 'jpg', 'jpeg', 'jpe', 'gif', 'png', 'webp', 'avif' );
3452  
3453      // Don't convert smilies that aren't images - they're probably emoji.
3454      if ( ! in_array( $ext, $image_exts, true ) ) {
3455          return $img;
3456      }
3457  
3458      /**
3459       * Filters the Smiley image URL before it's used in the image element.
3460       *
3461       * @since 2.9.0
3462       *
3463       * @param string $smiley_url URL for the smiley image.
3464       * @param string $img        Filename for the smiley image.
3465       * @param string $site_url   Site URL, as returned by site_url().
3466       */
3467      $src_url = apply_filters( 'smilies_src', includes_url( "images/smilies/$img" ), $img, site_url() );
3468  
3469      return sprintf( '<img src="%s" alt="%s" class="wp-smiley" style="height: 1em; max-height: 1em;" />', esc_url( $src_url ), esc_attr( $smiley ) );
3470  }
3471  
3472  /**
3473   * Converts text equivalent of smilies to images.
3474   *
3475   * Will only convert smilies if the option 'use_smilies' is true and the global
3476   * used in the function isn't empty.
3477   *
3478   * @since 0.71
3479   *
3480   * @global string|array $wp_smiliessearch
3481   *
3482   * @param string $text Content to convert smilies from text.
3483   * @return string Converted content with text smilies replaced with images.
3484   */
3485  function convert_smilies( $text ) {
3486      global $wp_smiliessearch;
3487  
3488      if ( ! get_option( 'use_smilies' ) || empty( $wp_smiliessearch ) ) {
3489          // Return default text.
3490          return $text;
3491      }
3492  
3493      // HTML loop taken from texturize function, could possible be consolidated.
3494      $textarr = preg_split( '/(<[^>]*>)/U', $text, -1, PREG_SPLIT_DELIM_CAPTURE ); // Capture the tags as well as in between.
3495  
3496      if ( false === $textarr ) {
3497          // Return default text.
3498          return $text;
3499      }
3500  
3501      // Loop stuff.
3502      $stop   = count( $textarr );
3503      $output = '';
3504  
3505      // Ignore processing of specific tags.
3506      $tags_to_ignore       = 'code|pre|style|script|textarea';
3507      $ignore_block_element = '';
3508  
3509      for ( $i = 0; $i < $stop; $i++ ) {
3510          $content = $textarr[ $i ];
3511  
3512          // If we're in an ignore block, wait until we find its closing tag.
3513          if ( '' === $ignore_block_element && preg_match( '/^<(' . $tags_to_ignore . ')[^>]*>/', $content, $matches ) ) {
3514              $ignore_block_element = $matches[1];
3515          }
3516  
3517          // If it's not a tag and not in ignore block.
3518          if ( '' === $ignore_block_element && strlen( $content ) > 0 && '<' !== $content[0] ) {
3519              $content = preg_replace_callback( $wp_smiliessearch, 'translate_smiley', $content );
3520          }
3521  
3522          // Did we exit ignore block?
3523          if ( '' !== $ignore_block_element && '</' . $ignore_block_element . '>' === $content ) {
3524              $ignore_block_element = '';
3525          }
3526  
3527          $output .= $content;
3528      }
3529  
3530      return $output;
3531  }
3532  
3533  /**
3534   * Verifies that an email is valid.
3535   *
3536   * Does not grok i18n domains. Not RFC compliant.
3537   *
3538   * @since 0.71
3539   *
3540   * @param string $email      Email address to verify.
3541   * @param bool   $deprecated Deprecated.
3542   * @return string|false Valid email address on success, false on failure.
3543   */
3544  function is_email( $email, $deprecated = false ) {
3545      if ( ! empty( $deprecated ) ) {
3546          _deprecated_argument( __FUNCTION__, '3.0.0' );
3547      }
3548  
3549      // Test for the minimum length the email can be.
3550      if ( strlen( $email ) < 6 ) {
3551          /**
3552           * Filters whether an email address is valid.
3553           *
3554           * This filter is evaluated under several different contexts, such as 'email_too_short',
3555           * 'email_no_at', 'local_invalid_chars', 'domain_period_sequence', 'domain_period_limits',
3556           * 'domain_no_periods', 'sub_hyphen_limits', 'sub_invalid_chars', or no specific context.
3557           *
3558           * @since 2.8.0
3559           *
3560           * @param string|false $is_email The email address if successfully passed the is_email() checks, false otherwise.
3561           * @param string       $email    The email address being checked.
3562           * @param string       $context  Context under which the email was tested.
3563           */
3564          return apply_filters( 'is_email', false, $email, 'email_too_short' );
3565      }
3566  
3567      // Test for an @ character after the first position.
3568      if ( strpos( $email, '@', 1 ) === false ) {
3569          /** This filter is documented in wp-includes/formatting.php */
3570          return apply_filters( 'is_email', false, $email, 'email_no_at' );
3571      }
3572  
3573      // Split out the local and domain parts.
3574      list( $local, $domain ) = explode( '@', $email, 2 );
3575  
3576      /*
3577       * LOCAL PART
3578       * Test for invalid characters.
3579       */
3580      if ( ! preg_match( '/^[a-zA-Z0-9!#$%&\'*+\/=?^_`{|}~\.-]+$/', $local ) ) {
3581          /** This filter is documented in wp-includes/formatting.php */
3582          return apply_filters( 'is_email', false, $email, 'local_invalid_chars' );
3583      }
3584  
3585      /*
3586       * DOMAIN PART
3587       * Test for sequences of periods.
3588       */
3589      if ( preg_match( '/\.{2,}/', $domain ) ) {
3590          /** This filter is documented in wp-includes/formatting.php */
3591          return apply_filters( 'is_email', false, $email, 'domain_period_sequence' );
3592      }
3593  
3594      // Test for leading and trailing periods and whitespace.
3595      if ( trim( $domain, " \t\n\r\0\x0B." ) !== $domain ) {
3596          /** This filter is documented in wp-includes/formatting.php */
3597          return apply_filters( 'is_email', false, $email, 'domain_period_limits' );
3598      }
3599  
3600      // Split the domain into subs.
3601      $subs = explode( '.', $domain );
3602  
3603      // Assume the domain will have at least two subs.
3604      if ( 2 > count( $subs ) ) {
3605          /** This filter is documented in wp-includes/formatting.php */
3606          return apply_filters( 'is_email', false, $email, 'domain_no_periods' );
3607      }
3608  
3609      // Loop through each sub.
3610      foreach ( $subs as $sub ) {
3611          // Test for leading and trailing hyphens and whitespace.
3612          if ( trim( $sub, " \t\n\r\0\x0B-" ) !== $sub ) {
3613              /** This filter is documented in wp-includes/formatting.php */
3614              return apply_filters( 'is_email', false, $email, 'sub_hyphen_limits' );
3615          }
3616  
3617          // Test for invalid characters.
3618          if ( ! preg_match( '/^[a-z0-9-]+$/i', $sub ) ) {
3619              /** This filter is documented in wp-includes/formatting.php */
3620              return apply_filters( 'is_email', false, $email, 'sub_invalid_chars' );
3621          }
3622      }
3623  
3624      // Congratulations, your email made it!
3625      /** This filter is documented in wp-includes/formatting.php */
3626      return apply_filters( 'is_email', $email, $email, null );
3627  }
3628  
3629  /**
3630   * Converts to ASCII from email subjects.
3631   *
3632   * @since 1.2.0
3633   *
3634   * @param string $subject Subject line.
3635   * @return string Converted string to ASCII.
3636   */
3637  function wp_iso_descrambler( $subject ) {
3638      /* this may only work with iso-8859-1, I'm afraid */
3639      if ( ! preg_match( '#\=\?(.+)\?Q\?(.+)\?\=#i', $subject, $matches ) ) {
3640          return $subject;
3641      }
3642  
3643      $subject = str_replace( '_', ' ', $matches[2] );
3644      return preg_replace_callback( '#\=([0-9a-f]{2})#i', '_wp_iso_convert', $subject );
3645  }
3646  
3647  /**
3648   * Helper function to convert hex encoded chars to ASCII.
3649   *
3650   * @since 3.1.0
3651   * @access private
3652   *
3653   * @param array $matches The preg_replace_callback matches array.
3654   * @return string Converted chars.
3655   */
3656  function _wp_iso_convert( $matches ) {
3657      return chr( hexdec( strtolower( $matches[1] ) ) );
3658  }
3659  
3660  /**
3661   * Given a date in the timezone of the site, returns that date in UTC.
3662   *
3663   * Requires and returns a date in the Y-m-d H:i:s format.
3664   * Return format can be overridden using the $format parameter.
3665   *
3666   * @since 1.2.0
3667   *
3668   * @param string $date_string The date to be converted, in the timezone of the site.
3669   * @param string $format      The format string for the returned date. Default 'Y-m-d H:i:s'.
3670   * @return string Formatted version of the date, in UTC.
3671   */
3672  function get_gmt_from_date( $date_string, $format = 'Y-m-d H:i:s' ) {
3673      $datetime = date_create( $date_string, wp_timezone() );
3674  
3675      if ( false === $datetime ) {
3676          return gmdate( $format, 0 );
3677      }
3678  
3679      return $datetime->setTimezone( new DateTimeZone( 'UTC' ) )->format( $format );
3680  }
3681  
3682  /**
3683   * Given a date in UTC or GMT timezone, returns that date in the timezone of the site.
3684   *
3685   * Requires a date in the Y-m-d H:i:s format.
3686   * Default return format of 'Y-m-d H:i:s' can be overridden using the `$format` parameter.
3687   *
3688   * @since 1.2.0
3689   *
3690   * @param string $date_string The date to be converted, in UTC or GMT timezone.
3691   * @param string $format      The format string for the returned date. Default 'Y-m-d H:i:s'.
3692   * @return string Formatted version of the date, in the site's timezone.
3693   */
3694  function get_date_from_gmt( $date_string, $format = 'Y-m-d H:i:s' ) {
3695      $datetime = date_create( $date_string, new DateTimeZone( 'UTC' ) );
3696  
3697      if ( false === $datetime ) {
3698          return gmdate( $format, 0 );
3699      }
3700  
3701      return $datetime->setTimezone( wp_timezone() )->format( $format );
3702  }
3703  
3704  /**
3705   * Given an ISO 8601 timezone, returns its UTC offset in seconds.
3706   *
3707   * @since 1.5.0
3708   *
3709   * @param string $timezone Either 'Z' for 0 offset or '±hhmm'.
3710   * @return int|float The offset in seconds.
3711   */
3712  function iso8601_timezone_to_offset( $timezone ) {
3713      // $timezone is either 'Z' or '[+|-]hhmm'.
3714      if ( 'Z' === $timezone ) {
3715          $offset = 0;
3716      } else {
3717          $sign    = ( str_starts_with( $timezone, '+' ) ) ? 1 : -1;
3718          $hours   = (int) substr( $timezone, 1, 2 );
3719          $minutes = (int) substr( $timezone, 3, 4 ) / 60;
3720          $offset  = $sign * HOUR_IN_SECONDS * ( $hours + $minutes );
3721      }
3722      return $offset;
3723  }
3724  
3725  /**
3726   * Given an ISO 8601 (Ymd\TH:i:sO) date, returns a MySQL DateTime (Y-m-d H:i:s) format used by post_date[_gmt].
3727   *
3728   * @since 1.5.0
3729   *
3730   * @param string $date_string Date and time in ISO 8601 format {@link https://en.wikipedia.org/wiki/ISO_8601}.
3731   * @param string $timezone    Optional. If set to 'gmt' returns the result in UTC. Default 'user'.
3732   * @return string|false The date and time in MySQL DateTime format - Y-m-d H:i:s, or false on failure.
3733   */
3734  function iso8601_to_datetime( $date_string, $timezone = 'user' ) {
3735      $timezone    = strtolower( $timezone );
3736      $wp_timezone = wp_timezone();
3737      $datetime    = date_create( $date_string, $wp_timezone ); // Timezone is ignored if input has one.
3738  
3739      if ( false === $datetime ) {
3740          return false;
3741      }
3742  
3743      if ( 'gmt' === $timezone ) {
3744          return $datetime->setTimezone( new DateTimeZone( 'UTC' ) )->format( 'Y-m-d H:i:s' );
3745      }
3746  
3747      if ( 'user' === $timezone ) {
3748          return $datetime->setTimezone( $wp_timezone )->format( 'Y-m-d H:i:s' );
3749      }
3750  
3751      return false;
3752  }
3753  
3754  /**
3755   * Strips out all characters that are not allowable in an email.
3756   *
3757   * @since 1.5.0
3758   *
3759   * @param string $email Email address to filter.
3760   * @return string Filtered email address.
3761   */
3762  function sanitize_email( $email ) {
3763      // Test for the minimum length the email can be.
3764      if ( strlen( $email ) < 6 ) {
3765          /**
3766           * Filters a sanitized email address.
3767           *
3768           * This filter is evaluated under several contexts, including 'email_too_short',
3769           * 'email_no_at', 'local_invalid_chars', 'domain_period_sequence', 'domain_period_limits',
3770           * 'domain_no_periods', 'domain_no_valid_subs', or no context.
3771           *
3772           * @since 2.8.0
3773           *
3774           * @param string $sanitized_email The sanitized email address.
3775           * @param string $email           The email address, as provided to sanitize_email().
3776           * @param string|null $message    A message to pass to the user. null if email is sanitized.
3777           */
3778          return apply_filters( 'sanitize_email', '', $email, 'email_too_short' );
3779      }
3780  
3781      // Test for an @ character after the first position.
3782      if ( strpos( $email, '@', 1 ) === false ) {
3783          /** This filter is documented in wp-includes/formatting.php */
3784          return apply_filters( 'sanitize_email', '', $email, 'email_no_at' );
3785      }
3786  
3787      // Split out the local and domain parts.
3788      list( $local, $domain ) = explode( '@', $email, 2 );
3789  
3790      /*
3791       * LOCAL PART
3792       * Test for invalid characters.
3793       */
3794      $local = preg_replace( '/[^a-zA-Z0-9!#$%&\'*+\/=?^_`{|}~\.-]/', '', $local );
3795      if ( '' === $local ) {
3796          /** This filter is documented in wp-includes/formatting.php */
3797          return apply_filters( 'sanitize_email', '', $email, 'local_invalid_chars' );
3798      }
3799  
3800      /*
3801       * DOMAIN PART
3802       * Test for sequences of periods.
3803       */
3804      $domain = preg_replace( '/\.{2,}/', '', $domain );
3805      if ( '' === $domain ) {
3806          /** This filter is documented in wp-includes/formatting.php */
3807          return apply_filters( 'sanitize_email', '', $email, 'domain_period_sequence' );
3808      }
3809  
3810      // Test for leading and trailing periods and whitespace.
3811      $domain = trim( $domain, " \t\n\r\0\x0B." );
3812      if ( '' === $domain ) {
3813          /** This filter is documented in wp-includes/formatting.php */
3814          return apply_filters( 'sanitize_email', '', $email, 'domain_period_limits' );
3815      }
3816  
3817      // Split the domain into subs.
3818      $subs = explode( '.', $domain );
3819  
3820      // Assume the domain will have at least two subs.
3821      if ( 2 > count( $subs ) ) {
3822          /** This filter is documented in wp-includes/formatting.php */
3823          return apply_filters( 'sanitize_email', '', $email, 'domain_no_periods' );
3824      }
3825  
3826      // Create an array that will contain valid subs.
3827      $new_subs = array();
3828  
3829      // Loop through each sub.
3830      foreach ( $subs as $sub ) {
3831          // Test for leading and trailing hyphens.
3832          $sub = trim( $sub, " \t\n\r\0\x0B-" );
3833  
3834          // Test for invalid characters.
3835          $sub = preg_replace( '/[^a-z0-9-]+/i', '', $sub );
3836  
3837          // If there's anything left, add it to the valid subs.
3838          if ( '' !== $sub ) {
3839              $new_subs[] = $sub;
3840          }
3841      }
3842  
3843      // If there aren't 2 or more valid subs.
3844      if ( 2 > count( $new_subs ) ) {
3845          /** This filter is documented in wp-includes/formatting.php */
3846          return apply_filters( 'sanitize_email', '', $email, 'domain_no_valid_subs' );
3847      }
3848  
3849      // Join valid subs into the new domain.
3850      $domain = implode( '.', $new_subs );
3851  
3852      // Put the email back together.
3853      $sanitized_email = $local . '@' . $domain;
3854  
3855      // Congratulations, your email made it!
3856      /** This filter is documented in wp-includes/formatting.php */
3857      return apply_filters( 'sanitize_email', $sanitized_email, $email, null );
3858  }
3859  
3860  /**
3861   * Determines the difference between two timestamps.
3862   *
3863   * The difference is returned in a human-readable format such as "1 hour",
3864   * "5 minutes", "2 days".
3865   *
3866   * @since 1.5.0
3867   * @since 5.3.0 Added support for showing a difference in seconds.
3868   *
3869   * @param int $from Unix timestamp from which the difference begins.
3870   * @param int $to   Optional. Unix timestamp to end the time difference. Default becomes time() if not set.
3871   * @return string Human-readable time difference.
3872   */
3873  function human_time_diff( $from, $to = 0 ) {
3874      if ( empty( $to ) ) {
3875          $to = time();
3876      }
3877  
3878      $diff = (int) abs( $to - $from );
3879  
3880      if ( $diff < MINUTE_IN_SECONDS ) {
3881          $secs = $diff;
3882          if ( $secs <= 1 ) {
3883              $secs = 1;
3884          }
3885          /* translators: Time difference between two dates, in seconds. %s: Number of seconds. */
3886          $since = sprintf( _n( '%s second', '%s seconds', $secs ), $secs );
3887      } elseif ( $diff < HOUR_IN_SECONDS && $diff >= MINUTE_IN_SECONDS ) {
3888          $mins = round( $diff / MINUTE_IN_SECONDS );
3889          if ( $mins <= 1 ) {
3890              $mins = 1;
3891          }
3892          /* translators: Time difference between two dates, in minutes. %s: Number of minutes. */
3893          $since = sprintf( _n( '%s minute', '%s minutes', $mins ), $mins );
3894      } elseif ( $diff < DAY_IN_SECONDS && $diff >= HOUR_IN_SECONDS ) {
3895          $hours = round( $diff / HOUR_IN_SECONDS );
3896          if ( $hours <= 1 ) {
3897              $hours = 1;
3898          }
3899          /* translators: Time difference between two dates, in hours. %s: Number of hours. */
3900          $since = sprintf( _n( '%s hour', '%s hours', $hours ), $hours );
3901      } elseif ( $diff < WEEK_IN_SECONDS && $diff >= DAY_IN_SECONDS ) {
3902          $days = round( $diff / DAY_IN_SECONDS );
3903          if ( $days <= 1 ) {
3904              $days = 1;
3905          }
3906          /* translators: Time difference between two dates, in days. %s: Number of days. */
3907          $since = sprintf( _n( '%s day', '%s days', $days ), $days );
3908      } elseif ( $diff < MONTH_IN_SECONDS && $diff >= WEEK_IN_SECONDS ) {
3909          $weeks = round( $diff / WEEK_IN_SECONDS );
3910          if ( $weeks <= 1 ) {
3911              $weeks = 1;
3912          }
3913          /* translators: Time difference between two dates, in weeks. %s: Number of weeks. */
3914          $since = sprintf( _n( '%s week', '%s weeks', $weeks ), $weeks );
3915      } elseif ( $diff < YEAR_IN_SECONDS && $diff >= MONTH_IN_SECONDS ) {
3916          $months = round( $diff / MONTH_IN_SECONDS );
3917          if ( $months <= 1 ) {
3918              $months = 1;
3919          }
3920          /* translators: Time difference between two dates, in months. %s: Number of months. */
3921          $since = sprintf( _n( '%s month', '%s months', $months ), $months );
3922      } elseif ( $diff >= YEAR_IN_SECONDS ) {
3923          $years = round( $diff / YEAR_IN_SECONDS );
3924          if ( $years <= 1 ) {
3925              $years = 1;
3926          }
3927          /* translators: Time difference between two dates, in years. %s: Number of years. */
3928          $since = sprintf( _n( '%s year', '%s years', $years ), $years );
3929      }
3930  
3931      /**
3932       * Filters the human-readable difference between two timestamps.
3933       *
3934       * @since 4.0.0
3935       *
3936       * @param string $since The difference in human-readable text.
3937       * @param int    $diff  The difference in seconds.
3938       * @param int    $from  Unix timestamp from which the difference begins.
3939       * @param int    $to    Unix timestamp to end the time difference.
3940       */
3941      return apply_filters( 'human_time_diff', $since, $diff, $from, $to );
3942  }
3943  
3944  /**
3945   * Generates an excerpt from the content, if needed.
3946   *
3947   * Returns a maximum of 55 words with an ellipsis appended if necessary.
3948   *
3949   * The 55-word limit can be modified by plugins/themes using the {@see 'excerpt_length'} filter
3950   * The ' [&hellip;]' string can be modified by plugins/themes using the {@see 'excerpt_more'} filter
3951   *
3952   * @since 1.5.0
3953   * @since 5.2.0 Added the `$post` parameter.
3954   * @since 6.3.0 Removes footnotes markup from the excerpt content.
3955   *
3956   * @param string             $text Optional. The excerpt. If set to empty, an excerpt is generated.
3957   * @param WP_Post|object|int $post Optional. WP_Post instance or Post ID/object. Default null.
3958   * @return string The excerpt.
3959   */
3960  function wp_trim_excerpt( $text = '', $post = null ) {
3961      $raw_excerpt = $text;
3962  
3963      if ( '' === trim( $text ) ) {
3964          $post = get_post( $post );
3965          $text = get_the_content( '', false, $post );
3966  
3967          $text = strip_shortcodes( $text );
3968          $text = excerpt_remove_blocks( $text );
3969          $text = excerpt_remove_footnotes( $text );
3970  
3971          /*
3972           * Temporarily unhook wp_filter_content_tags() since any tags
3973           * within the excerpt are stripped out. Modifying the tags here
3974           * is wasteful and can lead to bugs in the image counting logic.
3975           */
3976          $filter_image_removed = remove_filter( 'the_content', 'wp_filter_content_tags', 12 );
3977  
3978          /*
3979           * Temporarily unhook do_blocks() since excerpt_remove_blocks( $text )
3980           * handles block rendering needed for excerpt.
3981           */
3982          $filter_block_removed = remove_filter( 'the_content', 'do_blocks', 9 );
3983  
3984          /** This filter is documented in wp-includes/post-template.php */
3985          $text = apply_filters( 'the_content', $text );
3986          $text = str_replace( ']]>', ']]&gt;', $text );
3987  
3988          // Restore the original filter if removed.
3989          if ( $filter_block_removed ) {
3990              add_filter( 'the_content', 'do_blocks', 9 );
3991          }
3992  
3993          /*
3994           * Only restore the filter callback if it was removed above. The logic
3995           * to unhook and restore only applies on the default priority of 10,
3996           * which is generally used for the filter callback in WordPress core.
3997           */
3998          if ( $filter_image_removed ) {
3999              add_filter( 'the_content', 'wp_filter_content_tags', 12 );
4000          }
4001  
4002          /* translators: Maximum number of words used in a post excerpt. */
4003          $excerpt_length = (int) _x( '55', 'excerpt_length' );
4004  
4005          /**
4006           * Filters the maximum number of words in a post excerpt.
4007           *
4008           * @since 2.7.0
4009           *
4010           * @param int $number The maximum number of words. Default 55.
4011           */
4012          $excerpt_length = (int) apply_filters( 'excerpt_length', $excerpt_length );
4013  
4014          /**
4015           * Filters the string in the "more" link displayed after a trimmed excerpt.
4016           *
4017           * @since 2.9.0
4018           *
4019           * @param string $more_string The string shown within the more link.
4020           */
4021          $excerpt_more = apply_filters( 'excerpt_more', ' ' . '[&hellip;]' );
4022          $text         = wp_trim_words( $text, $excerpt_length, $excerpt_more );
4023  
4024      }
4025  
4026      /**
4027       * Filters the trimmed excerpt string.
4028       *
4029       * @since 2.8.0
4030       *
4031       * @param string $text        The trimmed text.
4032       * @param string $raw_excerpt The text prior to trimming.
4033       */
4034      return apply_filters( 'wp_trim_excerpt', $text, $raw_excerpt );
4035  }
4036  
4037  /**
4038   * Trims text to a certain number of words.
4039   *
4040   * This function is localized. For languages that count 'words' by the individual
4041   * character (such as East Asian languages), the $num_words argument will apply
4042   * to the number of individual characters.
4043   *
4044   * @since 3.3.0
4045   *
4046   * @param string $text      Text to trim.
4047   * @param int    $num_words Number of words. Default 55.
4048   * @param string $more      Optional. What to append if $text needs to be trimmed. Default '&hellip;'.
4049   * @return string Trimmed text.
4050   */
4051  function wp_trim_words( $text, $num_words = 55, $more = null ) {
4052      if ( null === $more ) {
4053          $more = __( '&hellip;' );
4054      }
4055  
4056      $original_text = $text;
4057      $text          = wp_strip_all_tags( $text );
4058      $num_words     = (int) $num_words;
4059  
4060      if ( str_starts_with( wp_get_word_count_type(), 'characters' ) && preg_match( '/^utf\-?8$/i', get_option( 'blog_charset' ) ) ) {
4061          $text = trim( preg_replace( "/[\n\r\t ]+/", ' ', $text ), ' ' );
4062          preg_match_all( '/./u', $text, $words_array );
4063          $words_array = array_slice( $words_array[0], 0, $num_words + 1 );
4064          $sep         = '';
4065      } else {
4066          $words_array = preg_split( "/[\n\r\t ]+/", $text, $num_words + 1, PREG_SPLIT_NO_EMPTY );
4067          $sep         = ' ';
4068      }
4069  
4070      if ( count( $words_array ) > $num_words ) {
4071          array_pop( $words_array );
4072          $text = implode( $sep, $words_array );
4073          $text = $text . $more;
4074      } else {
4075          $text = implode( $sep, $words_array );
4076      }
4077  
4078      /**
4079       * Filters the text content after words have been trimmed.
4080       *
4081       * @since 3.3.0
4082       *
4083       * @param string $text          The trimmed text.
4084       * @param int    $num_words     The number of words to trim the text to. Default 55.
4085       * @param string $more          An optional string to append to the end of the trimmed text, e.g. &hellip;.
4086       * @param string $original_text The text before it was trimmed.
4087       */
4088      return apply_filters( 'wp_trim_words', $text, $num_words, $more, $original_text );
4089  }
4090  
4091  /**
4092   * Converts named entities into numbered entities.
4093   *
4094   * @since 1.5.1
4095   *
4096   * @param string $text The text within which entities will be converted.
4097   * @return string Text with converted entities.
4098   */
4099  function ent2ncr( $text ) {
4100  
4101      /**
4102       * Filters text before named entities are converted into numbered entities.
4103       *
4104       * A non-null string must be returned for the filter to be evaluated.
4105       *
4106       * @since 3.3.0
4107       *
4108       * @param string|null $converted_text The text to be converted. Default null.
4109       * @param string      $text           The text prior to entity conversion.
4110       */
4111      $filtered = apply_filters( 'pre_ent2ncr', null, $text );
4112      if ( null !== $filtered ) {
4113          return $filtered;
4114      }
4115  
4116      $to_ncr = array(
4117          '&quot;'     => '&#34;',
4118          '&amp;'      => '&#38;',
4119          '&lt;'       => '&#60;',
4120          '&gt;'       => '&#62;',
4121          '|'          => '&#124;',
4122          '&nbsp;'     => '&#160;',
4123          '&iexcl;'    => '&#161;',
4124          '&cent;'     => '&#162;',
4125          '&pound;'    => '&#163;',
4126          '&curren;'   => '&#164;',
4127          '&yen;'      => '&#165;',
4128          '&brvbar;'   => '&#166;',
4129          '&brkbar;'   => '&#166;',
4130          '&sect;'     => '&#167;',
4131          '&uml;'      => '&#168;',
4132          '&die;'      => '&#168;',
4133          '&copy;'     => '&#169;',
4134          '&ordf;'     => '&#170;',
4135          '&laquo;'    => '&#171;',
4136          '&not;'      => '&#172;',
4137          '&shy;'      => '&#173;',
4138          '&reg;'      => '&#174;',
4139          '&macr;'     => '&#175;',
4140          '&hibar;'    => '&#175;',
4141          '&deg;'      => '&#176;',
4142          '&plusmn;'   => '&#177;',
4143          '&sup2;'     => '&#178;',
4144          '&sup3;'     => '&#179;',
4145          '&acute;'    => '&#180;',
4146          '&micro;'    => '&#181;',
4147          '&para;'     => '&#182;',
4148          '&middot;'   => '&#183;',
4149          '&cedil;'    => '&#184;',
4150          '&sup1;'     => '&#185;',
4151          '&ordm;'     => '&#186;',
4152          '&raquo;'    => '&#187;',
4153          '&frac14;'   => '&#188;',
4154          '&frac12;'   => '&#189;',
4155          '&frac34;'   => '&#190;',
4156          '&iquest;'   => '&#191;',
4157          '&Agrave;'   => '&#192;',
4158          '&Aacute;'   => '&#193;',
4159          '&Acirc;'    => '&#194;',
4160          '&Atilde;'   => '&#195;',
4161          '&Auml;'     => '&#196;',
4162          '&Aring;'    => '&#197;',
4163          '&AElig;'    => '&#198;',
4164          '&Ccedil;'   => '&#199;',
4165          '&Egrave;'   => '&#200;',
4166          '&Eacute;'   => '&#201;',
4167          '&Ecirc;'    => '&#202;',
4168          '&Euml;'     => '&#203;',
4169          '&Igrave;'   => '&#204;',
4170          '&Iacute;'   => '&#205;',
4171          '&Icirc;'    => '&#206;',
4172          '&Iuml;'     => '&#207;',
4173          '&ETH;'      => '&#208;',
4174          '&Ntilde;'   => '&#209;',
4175          '&Ograve;'   => '&#210;',
4176          '&Oacute;'   => '&#211;',
4177          '&Ocirc;'    => '&#212;',
4178          '&Otilde;'   => '&#213;',
4179          '&Ouml;'     => '&#214;',
4180          '&times;'    => '&#215;',
4181          '&Oslash;'   => '&#216;',
4182          '&Ugrave;'   => '&#217;',
4183          '&Uacute;'   => '&#218;',
4184          '&Ucirc;'    => '&#219;',
4185          '&Uuml;'     => '&#220;',
4186          '&Yacute;'   => '&#221;',
4187          '&THORN;'    => '&#222;',
4188          '&szlig;'    => '&#223;',
4189          '&agrave;'   => '&#224;',
4190          '&aacute;'   => '&#225;',
4191          '&acirc;'    => '&#226;',
4192          '&atilde;'   => '&#227;',
4193          '&auml;'     => '&#228;',
4194          '&aring;'    => '&#229;',
4195          '&aelig;'    => '&#230;',
4196          '&ccedil;'   => '&#231;',
4197          '&egrave;'   => '&#232;',
4198          '&eacute;'   => '&#233;',
4199          '&ecirc;'    => '&#234;',
4200          '&euml;'     => '&#235;',
4201          '&igrave;'   => '&#236;',
4202          '&iacute;'   => '&#237;',
4203          '&icirc;'    => '&#238;',
4204          '&iuml;'     => '&#239;',
4205          '&eth;'      => '&#240;',
4206          '&ntilde;'   => '&#241;',
4207          '&ograve;'   => '&#242;',
4208          '&oacute;'   => '&#243;',
4209          '&ocirc;'    => '&#244;',
4210          '&otilde;'   => '&#245;',
4211          '&ouml;'     => '&#246;',
4212          '&divide;'   => '&#247;',
4213          '&oslash;'   => '&#248;',
4214          '&ugrave;'   => '&#249;',
4215          '&uacute;'   => '&#250;',
4216          '&ucirc;'    => '&#251;',
4217          '&uuml;'     => '&#252;',
4218          '&yacute;'   => '&#253;',
4219          '&thorn;'    => '&#254;',
4220          '&yuml;'     => '&#255;',
4221          '&OElig;'    => '&#338;',
4222          '&oelig;'    => '&#339;',
4223          '&Scaron;'   => '&#352;',
4224          '&scaron;'   => '&#353;',
4225          '&Yuml;'     => '&#376;',
4226          '&fnof;'     => '&#402;',
4227          '&circ;'     => '&#710;',
4228          '&tilde;'    => '&#732;',
4229          '&Alpha;'    => '&#913;',
4230          '&Beta;'     => '&#914;',
4231          '&Gamma;'    => '&#915;',
4232          '&Delta;'    => '&#916;',
4233          '&Epsilon;'  => '&#917;',
4234          '&Zeta;'     => '&#918;',
4235          '&Eta;'      => '&#919;',
4236          '&Theta;'    => '&#920;',
4237          '&Iota;'     => '&#921;',
4238          '&Kappa;'    => '&#922;',
4239          '&Lambda;'   => '&#923;',
4240          '&Mu;'       => '&#924;',
4241          '&Nu;'       => '&#925;',
4242          '&Xi;'       => '&#926;',
4243          '&Omicron;'  => '&#927;',
4244          '&Pi;'       => '&#928;',
4245          '&Rho;'      => '&#929;',
4246          '&Sigma;'    => '&#931;',
4247          '&Tau;'      => '&#932;',
4248          '&Upsilon;'  => '&#933;',
4249          '&Phi;'      => '&#934;',
4250          '&Chi;'      => '&#935;',
4251          '&Psi;'      => '&#936;',
4252          '&Omega;'    => '&#937;',
4253          '&alpha;'    => '&#945;',
4254          '&beta;'     => '&#946;',
4255          '&gamma;'    => '&#947;',
4256          '&delta;'    => '&#948;',
4257          '&epsilon;'  => '&#949;',
4258          '&zeta;'     => '&#950;',
4259          '&eta;'      => '&#951;',
4260          '&theta;'    => '&#952;',
4261          '&iota;'     => '&#953;',
4262          '&kappa;'    => '&#954;',
4263          '&lambda;'   => '&#955;',
4264          '&mu;'       => '&#956;',
4265          '&nu;'       => '&#957;',
4266          '&xi;'       => '&#958;',
4267          '&omicron;'  => '&#959;',
4268          '&pi;'       => '&#960;',
4269          '&rho;'      => '&#961;',
4270          '&sigmaf;'   => '&#962;',
4271          '&sigma;'    => '&#963;',
4272          '&tau;'      => '&#964;',
4273          '&upsilon;'  => '&#965;',
4274          '&phi;'      => '&#966;',
4275          '&chi;'      => '&#967;',
4276          '&psi;'      => '&#968;',
4277          '&omega;'    => '&#969;',
4278          '&thetasym;' => '&#977;',
4279          '&upsih;'    => '&#978;',
4280          '&piv;'      => '&#982;',
4281          '&ensp;'     => '&#8194;',
4282          '&emsp;'     => '&#8195;',
4283          '&thinsp;'   => '&#8201;',
4284          '&zwnj;'     => '&#8204;',
4285          '&zwj;'      => '&#8205;',
4286          '&lrm;'      => '&#8206;',
4287          '&rlm;'      => '&#8207;',
4288          '&ndash;'    => '&#8211;',
4289          '&mdash;'    => '&#8212;',
4290          '&lsquo;'    => '&#8216;',
4291          '&rsquo;'    => '&#8217;',
4292          '&sbquo;'    => '&#8218;',
4293          '&ldquo;'    => '&#8220;',
4294          '&rdquo;'    => '&#8221;',
4295          '&bdquo;'    => '&#8222;',
4296          '&dagger;'   => '&#8224;',
4297          '&Dagger;'   => '&#8225;',
4298          '&bull;'     => '&#8226;',
4299          '&hellip;'   => '&#8230;',
4300          '&permil;'   => '&#8240;',
4301          '&prime;'    => '&#8242;',
4302          '&Prime;'    => '&#8243;',
4303          '&lsaquo;'   => '&#8249;',
4304          '&rsaquo;'   => '&#8250;',
4305          '&oline;'    => '&#8254;',
4306          '&frasl;'    => '&#8260;',
4307          '&euro;'     => '&#8364;',
4308          '&image;'    => '&#8465;',
4309          '&weierp;'   => '&#8472;',
4310          '&real;'     => '&#8476;',
4311          '&trade;'    => '&#8482;',
4312          '&alefsym;'  => '&#8501;',
4313          '&crarr;'    => '&#8629;',
4314          '&lArr;'     => '&#8656;',
4315          '&uArr;'     => '&#8657;',
4316          '&rArr;'     => '&#8658;',
4317          '&dArr;'     => '&#8659;',
4318          '&hArr;'     => '&#8660;',
4319          '&forall;'   => '&#8704;',
4320          '&part;'     => '&#8706;',
4321          '&exist;'    => '&#8707;',
4322          '&empty;'    => '&#8709;',
4323          '&nabla;'    => '&#8711;',
4324          '&isin;'     => '&#8712;',
4325          '&notin;'    => '&#8713;',
4326          '&ni;'       => '&#8715;',
4327          '&prod;'     => '&#8719;',
4328          '&sum;'      => '&#8721;',
4329          '&minus;'    => '&#8722;',
4330          '&lowast;'   => '&#8727;',
4331          '&radic;'    => '&#8730;',
4332          '&prop;'     => '&#8733;',
4333          '&infin;'    => '&#8734;',
4334          '&ang;'      => '&#8736;',
4335          '&and;'      => '&#8743;',
4336          '&or;'       => '&#8744;',
4337          '&cap;'      => '&#8745;',
4338          '&cup;'      => '&#8746;',
4339          '&int;'      => '&#8747;',
4340          '&there4;'   => '&#8756;',
4341          '&sim;'      => '&#8764;',
4342          '&cong;'     => '&#8773;',
4343          '&asymp;'    => '&#8776;',
4344          '&ne;'       => '&#8800;',
4345          '&equiv;'    => '&#8801;',
4346          '&le;'       => '&#8804;',
4347          '&ge;'       => '&#8805;',
4348          '&sub;'      => '&#8834;',
4349          '&sup;'      => '&#8835;',
4350          '&nsub;'     => '&#8836;',
4351          '&sube;'     => '&#8838;',
4352          '&supe;'     => '&#8839;',
4353          '&oplus;'    => '&#8853;',
4354          '&otimes;'   => '&#8855;',
4355          '&perp;'     => '&#8869;',
4356          '&sdot;'     => '&#8901;',
4357          '&lceil;'    => '&#8968;',
4358          '&rceil;'    => '&#8969;',
4359          '&lfloor;'   => '&#8970;',
4360          '&rfloor;'   => '&#8971;',
4361          '&lang;'     => '&#9001;',
4362          '&rang;'     => '&#9002;',
4363          '&larr;'     => '&#8592;',
4364          '&uarr;'     => '&#8593;',
4365          '&rarr;'     => '&#8594;',
4366          '&darr;'     => '&#8595;',
4367          '&harr;'     => '&#8596;',
4368          '&loz;'      => '&#9674;',
4369          '&spades;'   => '&#9824;',
4370          '&clubs;'    => '&#9827;',
4371          '&hearts;'   => '&#9829;',
4372          '&diams;'    => '&#9830;',
4373      );
4374  
4375      return str_replace( array_keys( $to_ncr ), array_values( $to_ncr ), $text );
4376  }
4377  
4378  /**
4379   * Formats text for the editor.
4380   *
4381   * Generally the browsers treat everything inside a textarea as text, but
4382   * it is still a good idea to HTML entity encode `<`, `>` and `&` in the content.
4383   *
4384   * The filter {@see 'format_for_editor'} is applied here. If `$text` is empty the
4385   * filter will be applied to an empty string.
4386   *
4387   * @since 4.3.0
4388   *
4389   * @see _WP_Editors::editor()
4390   *
4391   * @param string $text           The text to be formatted.
4392   * @param string $default_editor The default editor for the current user.
4393   *                               It is usually either 'html' or 'tinymce'.
4394   * @return string The formatted text after filter is applied.
4395   */
4396  function format_for_editor( $text, $default_editor = null ) {
4397      if ( $text ) {
4398          $text = htmlspecialchars( $text, ENT_NOQUOTES, get_option( 'blog_charset' ) );
4399      }
4400  
4401      /**
4402       * Filters the text after it is formatted for the editor.
4403       *
4404       * @since 4.3.0
4405       *
4406       * @param string $text           The formatted text.
4407       * @param string $default_editor The default editor for the current user.
4408       *                               It is usually either 'html' or 'tinymce'.
4409       */
4410      return apply_filters( 'format_for_editor', $text, $default_editor );
4411  }
4412  
4413  /**
4414   * Performs a deep string replace operation to ensure the values in $search are no longer present.
4415   *
4416   * Repeats the replacement operation until it no longer replaces anything to remove "nested" values
4417   * e.g. $subject = '%0%0%0DDD', $search ='%0D', $result ='' rather than the '%0%0DD' that
4418   * str_replace would return
4419   *
4420   * @since 2.8.1
4421   * @access private
4422   *
4423   * @param string|array $search  The value being searched for, otherwise known as the needle.
4424   *                              An array may be used to designate multiple needles.
4425   * @param string       $subject The string being searched and replaced on, otherwise known as the haystack.
4426   * @return string The string with the replaced values.
4427   */
4428  function _deep_replace( $search, $subject ) {
4429      $subject = (string) $subject;
4430  
4431      $count = 1;
4432      while ( $count ) {
4433          $subject = str_replace( $search, '', $subject, $count );
4434      }
4435  
4436      return $subject;
4437  }
4438  
4439  /**
4440   * Escapes data for use in a MySQL query.
4441   *
4442   * Usually you should prepare queries using wpdb::prepare().
4443   * Sometimes, spot-escaping is required or useful. One example
4444   * is preparing an array for use in an IN clause.
4445   *
4446   * NOTE: Since 4.8.3, '%' characters will be replaced with a placeholder string,
4447   * this prevents certain SQLi attacks from taking place. This change in behavior
4448   * may cause issues for code that expects the return value of esc_sql() to be usable
4449   * for other purposes.
4450   *
4451   * @since 2.8.0
4452   *
4453   * @global wpdb $wpdb WordPress database abstraction object.
4454   *
4455   * @param string|array $data Unescaped data.
4456   * @return string|array Escaped data, in the same type as supplied.
4457   */
4458  function esc_sql( $data ) {
4459      global $wpdb;
4460      return $wpdb->_escape( $data );
4461  }
4462  
4463  /**
4464   * Checks and cleans a URL.
4465   *
4466   * A number of characters are removed from the URL. If the URL is for displaying
4467   * (the default behavior) ampersands are also replaced. The {@see 'clean_url'} filter
4468   * is applied to the returned cleaned URL.
4469   *
4470   * @since 2.8.0
4471   *
4472   * @param string   $url       The URL to be cleaned.
4473   * @param string[] $protocols Optional. An array of acceptable protocols.
4474   *                            Defaults to return value of wp_allowed_protocols().
4475   * @param string   $_context  Private. Use sanitize_url() for database usage.
4476   * @return string The cleaned URL after the {@see 'clean_url'} filter is applied.
4477   *                An empty string is returned if `$url` specifies a protocol other than
4478   *                those in `$protocols`, or if `$url` contains an empty string.
4479   */
4480  function esc_url( $url, $protocols = null, $_context = 'display' ) {
4481      $original_url = $url;
4482  
4483      if ( '' === $url ) {
4484          return $url;
4485      }
4486  
4487      $url = str_replace( ' ', '%20', ltrim( $url ) );
4488      $url = preg_replace( '|[^a-z0-9-~+_.?#=!&;,/:%@$\|*\'()\[\]\\x80-\\xff]|i', '', $url );
4489  
4490      if ( '' === $url ) {
4491          return $url;
4492      }
4493  
4494      if ( 0 !== stripos( $url, 'mailto:' ) ) {
4495          $strip = array( '%0d', '%0a', '%0D', '%0A' );
4496          $url   = _deep_replace( $strip, $url );
4497      }
4498  
4499      $url = str_replace( ';//', '://', $url );
4500      /*
4501       * If the URL doesn't appear to contain a scheme, we presume
4502       * it needs http:// prepended (unless it's a relative link
4503       * starting with /, # or ?, or a PHP file).
4504       */
4505      if ( ! str_contains( $url, ':' ) && ! in_array( $url[0], array( '/', '#', '?' ), true ) &&
4506          ! preg_match( '/^[a-z0-9-]+?\.php/i', $url )
4507      ) {
4508          $url = 'http://' . $url;
4509      }
4510  
4511      // Replace ampersands and single quotes only when displaying.
4512      if ( 'display' === $_context ) {
4513          $url = wp_kses_normalize_entities( $url );
4514          $url = str_replace( '&amp;', '&#038;', $url );
4515          $url = str_replace( "'", '&#039;', $url );
4516      }
4517  
4518      if ( str_contains( $url, '[' ) || str_contains( $url, ']' ) ) {
4519  
4520          $parsed = wp_parse_url( $url );
4521          $front  = '';
4522  
4523          if ( isset( $parsed['scheme'] ) ) {
4524              $front .= $parsed['scheme'] . '://';
4525          } elseif ( '/' === $url[0] ) {
4526              $front .= '//';
4527          }
4528  
4529          if ( isset( $parsed['user'] ) ) {
4530              $front .= $parsed['user'];
4531          }
4532  
4533          if ( isset( $parsed['pass'] ) ) {
4534              $front .= ':' . $parsed['pass'];
4535          }
4536  
4537          if ( isset( $parsed['user'] ) || isset( $parsed['pass'] ) ) {
4538              $front .= '@';
4539          }
4540  
4541          if ( isset( $parsed['host'] ) ) {
4542              $front .= $parsed['host'];
4543          }
4544  
4545          if ( isset( $parsed['port'] ) ) {
4546              $front .= ':' . $parsed['port'];
4547          }
4548  
4549          $end_dirty = str_replace( $front, '', $url );
4550          $end_clean = str_replace( array( '[', ']' ), array( '%5B', '%5D' ), $end_dirty );
4551          $url       = str_replace( $end_dirty, $end_clean, $url );
4552  
4553      }
4554  
4555      if ( '/' === $url[0] ) {
4556          $good_protocol_url = $url;
4557      } else {
4558          if ( ! is_array( $protocols ) ) {
4559              $protocols = wp_allowed_protocols();
4560          }
4561          $good_protocol_url = wp_kses_bad_protocol( $url, $protocols );
4562          if ( strtolower( $good_protocol_url ) !== strtolower( $url ) ) {
4563              return '';
4564          }
4565      }
4566  
4567      /**
4568       * Filters a string cleaned and escaped for output as a URL.
4569       *
4570       * @since 2.3.0
4571       *
4572       * @param string $good_protocol_url The cleaned URL to be returned.
4573       * @param string $original_url      The URL prior to cleaning.
4574       * @param string $_context          If 'display', replace ampersands and single quotes only.
4575       */
4576      return apply_filters( 'clean_url', $good_protocol_url, $original_url, $_context );
4577  }
4578  
4579  /**
4580   * Sanitizes a URL for database or redirect usage.
4581   *
4582   * This function is an alias for sanitize_url().
4583   *
4584   * @since 2.8.0
4585   * @since 6.1.0 Turned into an alias for sanitize_url().
4586   *
4587   * @see sanitize_url()
4588   *
4589   * @param string   $url       The URL to be cleaned.
4590   * @param string[] $protocols Optional. An array of acceptable protocols.
4591   *                            Defaults to return value of wp_allowed_protocols().
4592   * @return string The cleaned URL after sanitize_url() is run.
4593   */
4594  function esc_url_raw( $url, $protocols = null ) {
4595      return sanitize_url( $url, $protocols );
4596  }
4597  
4598  /**
4599   * Sanitizes a URL for database or redirect usage.
4600   *
4601   * @since 2.3.1
4602   * @since 2.8.0 Deprecated in favor of esc_url_raw().
4603   * @since 5.9.0 Restored (un-deprecated).
4604   *
4605   * @see esc_url()
4606   *
4607   * @param string   $url       The URL to be cleaned.
4608   * @param string[] $protocols Optional. An array of acceptable protocols.
4609   *                            Defaults to return value of wp_allowed_protocols().
4610   * @return string The cleaned URL after esc_url() is run with the 'db' context.
4611   */
4612  function sanitize_url( $url, $protocols = null ) {
4613      return esc_url( $url, $protocols, 'db' );
4614  }
4615  
4616  /**
4617   * Converts entities, while preserving already-encoded entities.
4618   *
4619   * @link https://www.php.net/htmlentities Borrowed from the PHP Manual user notes.
4620   *
4621   * @since 1.2.2
4622   *
4623   * @param string $text The text to be converted.
4624   * @return string Converted text.
4625   */
4626  function htmlentities2( $text ) {
4627      $translation_table = get_html_translation_table( HTML_ENTITIES, ENT_QUOTES );
4628  
4629      $translation_table[ chr( 38 ) ] = '&';
4630  
4631      return preg_replace( '/&(?![A-Za-z]{0,4}\w{2,3};|#[0-9]{2,3};)/', '&amp;', strtr( $text, $translation_table ) );
4632  }
4633  
4634  /**
4635   * Escapes single quotes, `"`, `<`, `>`, `&`, and fixes line endings.
4636   *
4637   * Escapes text strings for echoing in JS. It is intended to be used for inline JS
4638   * (in a tag attribute, for example `onclick="..."`). Note that the strings have to
4639   * be in single quotes. The {@see 'js_escape'} filter is also applied here.
4640   *
4641   * @since 2.8.0
4642   *
4643   * @param string $text The text to be escaped.
4644   * @return string Escaped text.
4645   */
4646  function esc_js( $text ) {
4647      $safe_text = wp_check_invalid_utf8( $text );
4648      $safe_text = _wp_specialchars( $safe_text, ENT_COMPAT );
4649      $safe_text = preg_replace( '/&#(x)?0*(?(1)27|39);?/i', "'", stripslashes( $safe_text ) );
4650      $safe_text = str_replace( "\r", '', $safe_text );
4651      $safe_text = str_replace( "\n", '\\n', addslashes( $safe_text ) );
4652      /**
4653       * Filters a string cleaned and escaped for output in JavaScript.
4654       *
4655       * Text passed to esc_js() is stripped of invalid or special characters,
4656       * and properly slashed for output.
4657       *
4658       * @since 2.0.6
4659       *
4660       * @param string $safe_text The text after it has been escaped.
4661       * @param string $text      The text prior to being escaped.
4662       */
4663      return apply_filters( 'js_escape', $safe_text, $text );
4664  }
4665  
4666  /**
4667   * Escaping for HTML blocks.
4668   *
4669   * @since 2.8.0
4670   *
4671   * @param string $text
4672   * @return string
4673   */
4674  function esc_html( $text ) {
4675      $safe_text = wp_check_invalid_utf8( $text );
4676      $safe_text = _wp_specialchars( $safe_text, ENT_QUOTES );
4677      /**
4678       * Filters a string cleaned and escaped for output in HTML.
4679       *
4680       * Text passed to esc_html() is stripped of invalid or special characters
4681       * before output.
4682       *
4683       * @since 2.8.0
4684       *
4685       * @param string $safe_text The text after it has been escaped.
4686       * @param string $text      The text prior to being escaped.
4687       */
4688      return apply_filters( 'esc_html', $safe_text, $text );
4689  }
4690  
4691  /**
4692   * Escaping for HTML attributes.
4693   *
4694   * @since 2.8.0
4695   *
4696   * @param string $text
4697   * @return string
4698   */
4699  function esc_attr( $text ) {
4700      $safe_text = wp_check_invalid_utf8( $text );
4701      $safe_text = _wp_specialchars( $safe_text, ENT_QUOTES );
4702      /**
4703       * Filters a string cleaned and escaped for output in an HTML attribute.
4704       *
4705       * Text passed to esc_attr() is stripped of invalid or special characters
4706       * before output.
4707       *
4708       * @since 2.0.6
4709       *
4710       * @param string $safe_text The text after it has been escaped.
4711       * @param string $text      The text prior to being escaped.
4712       */
4713      return apply_filters( 'attribute_escape', $safe_text, $text );
4714  }
4715  
4716  /**
4717   * Escaping for textarea values.
4718   *
4719   * @since 3.1.0
4720   *
4721   * @param string $text
4722   * @return string
4723   */
4724  function esc_textarea( $text ) {
4725      $safe_text = htmlspecialchars( $text, ENT_QUOTES, get_option( 'blog_charset' ) );
4726      /**
4727       * Filters a string cleaned and escaped for output in a textarea element.
4728       *
4729       * @since 3.1.0
4730       *
4731       * @param string $safe_text The text after it has been escaped.
4732       * @param string $text      The text prior to being escaped.
4733       */
4734      return apply_filters( 'esc_textarea', $safe_text, $text );
4735  }
4736  
4737  /**
4738   * Escaping for XML blocks.
4739   *
4740   * @since 5.5.0
4741   *
4742   * @param string $text Text to escape.
4743   * @return string Escaped text.
4744   */
4745  function esc_xml( $text ) {
4746      $safe_text = wp_check_invalid_utf8( $text );
4747  
4748      $cdata_regex = '\<\!\[CDATA\[.*?\]\]\>';
4749      $regex       = <<<EOF
4750  /
4751      (?=.*?{$cdata_regex})                 # lookahead that will match anything followed by a CDATA Section
4752      (?<non_cdata_followed_by_cdata>(.*?)) # the "anything" matched by the lookahead
4753      (?<cdata>({$cdata_regex}))            # the CDATA Section matched by the lookahead
4754  
4755  |                                          # alternative
4756  
4757      (?<non_cdata>(.*))                    # non-CDATA Section
4758  /sx
4759  EOF;
4760  
4761      $safe_text = (string) preg_replace_callback(
4762          $regex,
4763          static function ( $matches ) {
4764              if ( ! isset( $matches[0] ) ) {
4765                  return '';
4766              }
4767  
4768              if ( isset( $matches['non_cdata'] ) ) {
4769                  // escape HTML entities in the non-CDATA Section.
4770                  return _wp_specialchars( $matches['non_cdata'], ENT_XML1 );
4771              }
4772  
4773              // Return the CDATA Section unchanged, escape HTML entities in the rest.
4774              return _wp_specialchars( $matches['non_cdata_followed_by_cdata'], ENT_XML1 ) . $matches['cdata'];
4775          },
4776          $safe_text
4777      );
4778  
4779      /**
4780       * Filters a string cleaned and escaped for output in XML.
4781       *
4782       * Text passed to esc_xml() is stripped of invalid or special characters
4783       * before output. HTML named character references are converted to their
4784       * equivalent code points.
4785       *
4786       * @since 5.5.0
4787       *
4788       * @param string $safe_text The text after it has been escaped.
4789       * @param string $text      The text prior to being escaped.
4790       */
4791      return apply_filters( 'esc_xml', $safe_text, $text );
4792  }
4793  
4794  /**
4795   * Escapes an HTML tag name.
4796   *
4797   * @since 2.5.0
4798   * @since 6.5.5 Allow hyphens in tag names (i.e. custom elements).
4799   *
4800   * @param string $tag_name
4801   * @return string
4802   */
4803  function tag_escape( $tag_name ) {
4804      $safe_tag = strtolower( preg_replace( '/[^a-zA-Z0-9-_:]/', '', $tag_name ) );
4805      /**
4806       * Filters a string cleaned and escaped for output as an HTML tag.
4807       *
4808       * @since 2.8.0
4809       *
4810       * @param string $safe_tag The tag name after it has been escaped.
4811       * @param string $tag_name The text before it was escaped.
4812       */
4813      return apply_filters( 'tag_escape', $safe_tag, $tag_name );
4814  }
4815  
4816  /**
4817   * Converts full URL paths to absolute paths.
4818   *
4819   * Removes the http or https protocols and the domain. Keeps the path '/' at the
4820   * beginning, so it isn't a true relative link, but from the web root base.
4821   *
4822   * @since 2.1.0
4823   * @since 4.1.0 Support was added for relative URLs.
4824   *
4825   * @param string $link Full URL path.
4826   * @return string Absolute path.
4827   */
4828  function wp_make_link_relative( $link ) {
4829      return preg_replace( '|^(https?:)?//[^/]+(/?.*)|i', '$2', $link );
4830  }
4831  
4832  /**
4833   * Sanitizes various option values based on the nature of the option.
4834   *
4835   * This is basically a switch statement which will pass $value through a number
4836   * of functions depending on the $option.
4837   *
4838   * @since 2.0.5
4839   *
4840   * @global wpdb $wpdb WordPress database abstraction object.
4841   *
4842   * @param string $option The name of the option.
4843   * @param mixed  $value  The unsanitized value.
4844   * @return mixed Sanitized value.
4845   */
4846  function sanitize_option( $option, $value ) {
4847      global $wpdb;
4848  
4849      $original_value = $value;
4850      $error          = null;
4851  
4852      switch ( $option ) {
4853          case 'admin_email':
4854          case 'new_admin_email':
4855              $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
4856              if ( is_wp_error( $value ) ) {
4857                  $error = $value->get_error_message();
4858              } else {
4859                  $value = sanitize_email( $value );
4860                  if ( ! is_email( $value ) ) {
4861                      $error = __( 'The email address entered did not appear to be a valid email address. Please enter a valid email address.' );
4862                  }
4863              }
4864              break;
4865  
4866          case 'thumbnail_size_w':
4867          case 'thumbnail_size_h':
4868          case 'medium_size_w':
4869          case 'medium_size_h':
4870          case 'medium_large_size_w':
4871          case 'medium_large_size_h':
4872          case 'large_size_w':
4873          case 'large_size_h':
4874          case 'mailserver_port':
4875          case 'comment_max_links':
4876          case 'page_on_front':
4877          case 'page_for_posts':
4878          case 'rss_excerpt_length':
4879          case 'default_category':
4880          case 'default_email_category':
4881          case 'default_link_category':
4882          case 'close_comments_days_old':
4883          case 'comments_per_page':
4884          case 'thread_comments_depth':
4885          case 'users_can_register':
4886          case 'start_of_week':
4887          case 'site_icon':
4888          case 'fileupload_maxk':
4889              $value = absint( $value );
4890              break;
4891  
4892          case 'posts_per_page':
4893          case 'posts_per_rss':
4894              $value = (int) $value;
4895              if ( empty( $value ) ) {
4896                  $value = 1;
4897              }
4898              if ( $value < -1 ) {
4899                  $value = abs( $value );
4900              }
4901              break;
4902  
4903          case 'default_ping_status':
4904          case 'default_comment_status':
4905              // Options that if not there have 0 value but need to be something like "closed".
4906              if ( '0' === (string) $value || '' === $value ) {
4907                  $value = 'closed';
4908              }
4909              break;
4910  
4911          case 'blogdescription':
4912          case 'blogname':
4913              $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
4914              if ( $value !== $original_value ) {
4915                  $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', wp_encode_emoji( $original_value ) );
4916              }
4917  
4918              if ( is_wp_error( $value ) ) {
4919                  $error = $value->get_error_message();
4920              } else {
4921                  $value = esc_html( $value );
4922              }
4923              break;
4924  
4925          case 'blog_charset':
4926              if ( is_string( $value ) ) {
4927                  $value = preg_replace( '/[^a-zA-Z0-9_-]/', '', $value ); // Strips slashes.
4928              } else {
4929                  $value = '';
4930              }
4931              break;
4932  
4933          case 'blog_public':
4934              // This is the value if the settings checkbox is not checked on POST. Don't rely on this.
4935              if ( null === $value ) {
4936                  $value = 1;
4937              } else {
4938                  $value = (int) $value;
4939              }
4940              break;
4941  
4942          case 'date_format':
4943          case 'time_format':
4944          case 'mailserver_url':
4945          case 'mailserver_login':
4946          case 'mailserver_pass':
4947          case 'upload_path':
4948              $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
4949              if ( is_wp_error( $value ) ) {
4950                  $error = $value->get_error_message();
4951              } else {
4952                  $value = strip_tags( $value );
4953                  $value = wp_kses_data( $value );
4954              }
4955              break;
4956  
4957          case 'ping_sites':
4958              $value = explode( "\n", $value );
4959              $value = array_filter( array_map( 'trim', $value ) );
4960              $value = array_filter( array_map( 'sanitize_url', $value ) );
4961              $value = implode( "\n", $value );
4962              break;
4963  
4964          case 'gmt_offset':
4965              if ( is_numeric( $value ) ) {
4966                  $value = preg_replace( '/[^0-9:.-]/', '', $value ); // Strips slashes.
4967              } else {
4968                  $value = '';
4969              }
4970              break;
4971  
4972          case 'siteurl':
4973              $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
4974              if ( is_wp_error( $value ) ) {
4975                  $error = $value->get_error_message();
4976              } else {
4977                  if ( preg_match( '#http(s?)://(.+)#i', $value ) ) {
4978                      $value = sanitize_url( $value );
4979                  } else {
4980                      $error = __( 'The WordPress address you entered did not appear to be a valid URL. Please enter a valid URL.' );
4981                  }
4982              }
4983              break;
4984  
4985          case 'home':
4986              $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
4987              if ( is_wp_error( $value ) ) {
4988                  $error = $value->get_error_message();
4989              } else {
4990                  if ( preg_match( '#http(s?)://(.+)#i', $value ) ) {
4991                      $value = sanitize_url( $value );
4992                  } else {
4993                      $error = __( 'The Site address you entered did not appear to be a valid URL. Please enter a valid URL.' );
4994                  }
4995              }
4996              break;
4997  
4998          case 'WPLANG':
4999              $allowed = get_available_languages();
5000              if ( ! is_multisite() && defined( 'WPLANG' ) && '' !== WPLANG && 'en_US' !== WPLANG ) {
5001                  $allowed[] = WPLANG;
5002              }
5003              if ( ! in_array( $value, $allowed, true ) && ! empty( $value ) ) {
5004                  $value = get_option( $option );
5005              }
5006              break;
5007  
5008          case 'illegal_names':
5009              $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
5010              if ( is_wp_error( $value ) ) {
5011                  $error = $value->get_error_message();
5012              } else {
5013                  if ( ! is_array( $value ) ) {
5014                      $value = explode( ' ', $value );
5015                  }
5016  
5017                  $value = array_values( array_filter( array_map( 'trim', $value ) ) );
5018  
5019                  if ( ! $value ) {
5020                      $value = '';
5021                  }
5022              }
5023              break;
5024  
5025          case 'limited_email_domains':
5026          case 'banned_email_domains':
5027              $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
5028              if ( is_wp_error( $value ) ) {
5029                  $error = $value->get_error_message();
5030              } else {
5031                  if ( ! is_array( $value ) ) {
5032                      $value = explode( "\n", $value );
5033                  }
5034  
5035                  $domains = array_values( array_filter( array_map( 'trim', $value ) ) );
5036                  $value   = array();
5037  
5038                  foreach ( $domains as $domain ) {
5039                      if ( ! preg_match( '/(--|\.\.)/', $domain ) && preg_match( '|^([a-zA-Z0-9-\.])+$|', $domain ) ) {
5040                          $value[] = $domain;
5041                      }
5042                  }
5043                  if ( ! $value ) {
5044                      $value = '';
5045                  }
5046              }
5047              break;
5048  
5049          case 'timezone_string':
5050              $allowed_zones = timezone_identifiers_list( DateTimeZone::ALL_WITH_BC );
5051              if ( ! in_array( $value, $allowed_zones, true ) && ! empty( $value ) ) {
5052                  $error = __( 'The timezone you have entered is not valid. Please select a valid timezone.' );
5053              }
5054              break;
5055  
5056          case 'permalink_structure':
5057          case 'category_base':
5058          case 'tag_base':
5059              $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
5060              if ( is_wp_error( $value ) ) {
5061                  $error = $value->get_error_message();
5062              } else {
5063                  $value = sanitize_url( $value );
5064                  $value = str_replace( 'http://', '', $value );
5065              }
5066  
5067              if ( 'permalink_structure' === $option && null === $error
5068                  && '' !== $value && ! preg_match( '/%[^\/%]+%/', $value )
5069              ) {
5070                  $error = sprintf(
5071                      /* translators: %s: Documentation URL. */
5072                      __( 'A structure tag is required when using custom permalinks. <a href="%s">Learn more</a>' ),
5073                      __( 'https://wordpress.org/documentation/article/customize-permalinks/#choosing-your-permalink-structure' )
5074                  );
5075              }
5076              break;
5077  
5078          case 'default_role':
5079              if ( ! get_role( $value ) && get_role( 'subscriber' ) ) {
5080                  $value = 'subscriber';
5081              }
5082              break;
5083  
5084          case 'moderation_keys':
5085          case 'disallowed_keys':
5086              $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
5087              if ( is_wp_error( $value ) ) {
5088                  $error = $value->get_error_message();
5089              } else {
5090                  $value = explode( "\n", $value );
5091                  $value = array_filter( array_map( 'trim', $value ) );
5092                  $value = array_unique( $value );
5093                  $value = implode( "\n", $value );
5094              }
5095              break;
5096      }
5097  
5098      if ( null !== $error ) {
5099          if ( '' === $error && is_wp_error( $value ) ) {
5100              /* translators: 1: Option name, 2: Error code. */
5101              $error = sprintf( __( 'Could not sanitize the %1$s option. Error code: %2$s' ), $option, $value->get_error_code() );
5102          }
5103  
5104          $value = get_option( $option );
5105          if ( function_exists( 'add_settings_error' ) ) {
5106              add_settings_error( $option, "invalid_{$option}", $error );
5107          }
5108      }
5109  
5110      /**
5111       * Filters an option value following sanitization.
5112       *
5113       * @since 2.3.0
5114       * @since 4.3.0 Added the `$original_value` parameter.
5115       *
5116       * @param mixed  $value          The sanitized option value.
5117       * @param string $option         The option name.
5118       * @param mixed  $original_value The original value passed to the function.
5119       */
5120      return apply_filters( "sanitize_option_{$option}", $value, $option, $original_value );
5121  }
5122  
5123  /**
5124   * Maps a function to all non-iterable elements of an array or an object.
5125   *
5126   * This is similar to `array_walk_recursive()` but acts upon objects too.
5127   *
5128   * @since 4.4.0
5129   *
5130   * @param mixed    $value    The array, object, or scalar.
5131   * @param callable $callback The function to map onto $value.
5132   * @return mixed The value with the callback applied to all non-arrays and non-objects inside it.
5133   */
5134  function map_deep( $value, $callback ) {
5135      if ( is_array( $value ) ) {
5136          foreach ( $value as $index => $item ) {
5137              $value[ $index ] = map_deep( $item, $callback );
5138          }
5139      } elseif ( is_object( $value ) ) {
5140          $object_vars = get_object_vars( $value );
5141          foreach ( $object_vars as $property_name => $property_value ) {
5142              $value->$property_name = map_deep( $property_value, $callback );
5143          }
5144      } else {
5145          $value = call_user_func( $callback, $value );
5146      }
5147  
5148      return $value;
5149  }
5150  
5151  /**
5152   * Parses a string into variables to be stored in an array.
5153   *
5154   * @since 2.2.1
5155   *
5156   * @param string $input_string The string to be parsed.
5157   * @param array  $result       Variables will be stored in this array.
5158   */
5159  function wp_parse_str( $input_string, &$result ) {
5160      parse_str( (string) $input_string, $result );
5161  
5162      /**
5163       * Filters the array of variables derived from a parsed string.
5164       *
5165       * @since 2.2.1
5166       *
5167       * @param array $result The array populated with variables.
5168       */
5169      $result = apply_filters( 'wp_parse_str', $result );
5170  }
5171  
5172  /**
5173   * Converts lone less than signs.
5174   *
5175   * KSES already converts lone greater than signs.
5176   *
5177   * @since 2.3.0
5178   *
5179   * @param string $content Text to be converted.
5180   * @return string Converted text.
5181   */
5182  function wp_pre_kses_less_than( $content ) {
5183      return preg_replace_callback( '%<[^>]*?((?=<)|>|$)%', 'wp_pre_kses_less_than_callback', $content );
5184  }
5185  
5186  /**
5187   * Callback function used by preg_replace.
5188   *
5189   * @since 2.3.0
5190   *
5191   * @param string[] $matches Populated by matches to preg_replace.
5192   * @return string The text returned after esc_html if needed.
5193   */
5194  function wp_pre_kses_less_than_callback( $matches ) {
5195      if ( ! str_contains( $matches[0], '>' ) ) {
5196          return esc_html( $matches[0] );
5197      }
5198      return $matches[0];
5199  }
5200  
5201  /**
5202   * Removes non-allowable HTML from parsed block attribute values when filtering
5203   * in the post context.
5204   *
5205   * @since 5.3.1
5206   *
5207   * @param string         $content           Content to be run through KSES.
5208   * @param array[]|string $allowed_html      An array of allowed HTML elements
5209   *                                          and attributes, or a context name
5210   *                                          such as 'post'.
5211   * @param string[]       $allowed_protocols Array of allowed URL protocols.
5212   * @return string Filtered text to run through KSES.
5213   */
5214  function wp_pre_kses_block_attributes( $content, $allowed_html, $allowed_protocols ) {
5215      /*
5216       * `filter_block_content` is expected to call `wp_kses`. Temporarily remove
5217       * the filter to avoid recursion.
5218       */
5219      remove_filter( 'pre_kses', 'wp_pre_kses_block_attributes', 10 );
5220      $content = filter_block_content( $content, $allowed_html, $allowed_protocols );
5221      add_filter( 'pre_kses', 'wp_pre_kses_block_attributes', 10, 3 );
5222  
5223      return $content;
5224  }
5225  
5226  /**
5227   * WordPress' implementation of PHP sprintf() with filters.
5228   *
5229   * @since 2.5.0
5230   * @since 5.3.0 Formalized the existing and already documented `...$args` parameter
5231   *              by adding it to the function signature.
5232   *
5233   * @link https://www.php.net/sprintf
5234   *
5235   * @param string $pattern The string which formatted args are inserted.
5236   * @param mixed  ...$args Arguments to be formatted into the $pattern string.
5237   * @return string The formatted string.
5238   */
5239  function wp_sprintf( $pattern, ...$args ) {
5240      $len       = strlen( $pattern );
5241      $start     = 0;
5242      $result    = '';
5243      $arg_index = 0;
5244  
5245      while ( $len > $start ) {
5246          // Last character: append and break.
5247          if ( strlen( $pattern ) - 1 === $start ) {
5248              $result .= substr( $pattern, -1 );
5249              break;
5250          }
5251  
5252          // Literal %: append and continue.
5253          if ( '%%' === substr( $pattern, $start, 2 ) ) {
5254              $start  += 2;
5255              $result .= '%';
5256              continue;
5257          }
5258  
5259          // Get fragment before next %.
5260          $end = strpos( $pattern, '%', $start + 1 );
5261          if ( false === $end ) {
5262              $end = $len;
5263          }
5264          $fragment = substr( $pattern, $start, $end - $start );
5265  
5266          // Fragment has a specifier.
5267          if ( '%' === $pattern[ $start ] ) {
5268              // Find numbered arguments or take the next one in order.
5269              if ( preg_match( '/^%(\d+)\$/', $fragment, $matches ) ) {
5270                  $index    = $matches[1] - 1; // 0-based array vs 1-based sprintf() arguments.
5271                  $arg      = isset( $args[ $index ] ) ? $args[ $index ] : '';
5272                  $fragment = str_replace( "%{$matches[1]}$", '%', $fragment );
5273              } else {
5274                  $arg = isset( $args[ $arg_index ] ) ? $args[ $arg_index ] : '';
5275                  ++$arg_index;
5276              }
5277  
5278              /**
5279               * Filters a fragment from the pattern passed to wp_sprintf().
5280               *
5281               * If the fragment is unchanged, then sprintf() will be run on the fragment.
5282               *
5283               * @since 2.5.0
5284               *
5285               * @param string $fragment A fragment from the pattern.
5286               * @param string $arg      The argument.
5287               */
5288              $_fragment = apply_filters( 'wp_sprintf', $fragment, $arg );
5289  
5290              if ( $_fragment !== $fragment ) {
5291                  $fragment = $_fragment;
5292              } else {
5293                  $fragment = sprintf( $fragment, (string) $arg );
5294              }
5295          }
5296  
5297          // Append to result and move to next fragment.
5298          $result .= $fragment;
5299          $start   = $end;
5300      }
5301  
5302      return $result;
5303  }
5304  
5305  /**
5306   * Localizes list items before the rest of the content.
5307   *
5308   * The '%l' must be at the first characters can then contain the rest of the
5309   * content. The list items will have ', ', ', and', and ' and ' added depending
5310   * on the amount of list items in the $args parameter.
5311   *
5312   * @since 2.5.0
5313   *
5314   * @param string $pattern Content containing '%l' at the beginning.
5315   * @param array  $args    List items to prepend to the content and replace '%l'.
5316   * @return string Localized list items and rest of the content.
5317   */
5318  function wp_sprintf_l( $pattern, $args ) {
5319      // Not a match.
5320      if ( ! str_starts_with( $pattern, '%l' ) ) {
5321          return $pattern;
5322      }
5323  
5324      // Nothing to work with.
5325      if ( empty( $args ) ) {
5326          return '';
5327      }
5328  
5329      /**
5330       * Filters the translated delimiters used by wp_sprintf_l().
5331       * Placeholders (%s) are included to assist translators and then
5332       * removed before the array of strings reaches the filter.
5333       *
5334       * Please note: Ampersands and entities should be avoided here.
5335       *
5336       * @since 2.5.0
5337       *
5338       * @param array $delimiters An array of translated delimiters.
5339       */
5340      $l = apply_filters(
5341          'wp_sprintf_l',
5342          array(
5343              /* translators: Used to join items in a list with more than 2 items. */
5344              'between'          => sprintf( __( '%1$s, %2$s' ), '', '' ),
5345              /* translators: Used to join last two items in a list with more than 2 times. */
5346              'between_last_two' => sprintf( __( '%1$s, and %2$s' ), '', '' ),
5347              /* translators: Used to join items in a list with only 2 items. */
5348              'between_only_two' => sprintf( __( '%1$s and %2$s' ), '', '' ),
5349          )
5350      );
5351  
5352      $args   = (array) $args;
5353      $result = array_shift( $args );
5354      if ( count( $args ) === 1 ) {
5355          $result .= $l['between_only_two'] . array_shift( $args );
5356      }
5357  
5358      // Loop when more than two args.
5359      $i = count( $args );
5360      while ( $i ) {
5361          $arg = array_shift( $args );
5362          --$i;
5363          if ( 0 === $i ) {
5364              $result .= $l['between_last_two'] . $arg;
5365          } else {
5366              $result .= $l['between'] . $arg;
5367          }
5368      }
5369  
5370      return $result . substr( $pattern, 2 );
5371  }
5372  
5373  /**
5374   * Safely extracts not more than the first $count characters from HTML string.
5375   *
5376   * UTF-8, tags and entities safe prefix extraction. Entities inside will *NOT*
5377   * be counted as one character. For example &amp; will be counted as 4, &lt; as
5378   * 3, etc.
5379   *
5380   * @since 2.5.0
5381   *
5382   * @param string $str   String to get the excerpt from.
5383   * @param int    $count Maximum number of characters to take.
5384   * @param string $more  Optional. What to append if $str needs to be trimmed. Defaults to empty string.
5385   * @return string The excerpt.
5386   */
5387  function wp_html_excerpt( $str, $count, $more = null ) {
5388      if ( null === $more ) {
5389          $more = '';
5390      }
5391  
5392      $str     = wp_strip_all_tags( $str, true );
5393      $excerpt = mb_substr( $str, 0, $count );
5394  
5395      // Remove part of an entity at the end.
5396      $excerpt = preg_replace( '/&[^;\s]{0,6}$/', '', $excerpt );
5397  
5398      if ( $str !== $excerpt ) {
5399          $excerpt = trim( $excerpt ) . $more;
5400      }
5401  
5402      return $excerpt;
5403  }
5404  
5405  /**
5406   * Adds a base URL to relative links in passed content.
5407   *
5408   * By default, this function supports the 'src' and 'href' attributes.
5409   * However, this can be modified via the `$attrs` parameter.
5410   *
5411   * @since 2.7.0
5412   *
5413   * @global string $_links_add_base
5414   *
5415   * @param string   $content String to search for links in.
5416   * @param string   $base    The base URL to prefix to links.
5417   * @param string[] $attrs   The attributes which should be processed.
5418   * @return string The processed content.
5419   */
5420  function links_add_base_url( $content, $base, $attrs = array( 'src', 'href' ) ) {
5421      global $_links_add_base;
5422      $_links_add_base = $base;
5423      $attrs           = implode( '|', (array) $attrs );
5424      return preg_replace_callback( "!($attrs)=(['\"])(.+?)\\2!i", '_links_add_base', $content );
5425  }
5426  
5427  /**
5428   * Callback to add a base URL to relative links in passed content.
5429   *
5430   * @since 2.7.0
5431   * @access private
5432   *
5433   * @global string $_links_add_base
5434   *
5435   * @param string $m The matched link.
5436   * @return string The processed link.
5437   */
5438  function _links_add_base( $m ) {
5439      global $_links_add_base;
5440      // 1 = attribute name  2 = quotation mark  3 = URL.
5441      return $m[1] . '=' . $m[2] .
5442          ( preg_match( '#^(\w{1,20}):#', $m[3], $protocol ) && in_array( $protocol[1], wp_allowed_protocols(), true ) ?
5443              $m[3] :
5444              WP_Http::make_absolute_url( $m[3], $_links_add_base )
5445          )
5446          . $m[2];
5447  }
5448  
5449  /**
5450   * Adds a target attribute to all links in passed content.
5451   *
5452   * By default, this function only applies to `<a>` tags.
5453   * However, this can be modified via the `$tags` parameter.
5454   *
5455   * *NOTE:* Any current target attribute will be stripped and replaced.
5456   *
5457   * @since 2.7.0
5458   *
5459   * @global string $_links_add_target
5460   *
5461   * @param string   $content String to search for links in.
5462   * @param string   $target  The target to add to the links.
5463   * @param string[] $tags    An array of tags to apply to.
5464   * @return string The processed content.
5465   */
5466  function links_add_target( $content, $target = '_blank', $tags = array( 'a' ) ) {
5467      global $_links_add_target;
5468      $_links_add_target = $target;
5469      $tags              = implode( '|', (array) $tags );
5470      return preg_replace_callback( "!<($tags)((\s[^>]*)?)>!i", '_links_add_target', $content );
5471  }
5472  
5473  /**
5474   * Callback to add a target attribute to all links in passed content.
5475   *
5476   * @since 2.7.0
5477   * @access private
5478   *
5479   * @global string $_links_add_target
5480   *
5481   * @param string $m The matched link.
5482   * @return string The processed link.
5483   */
5484  function _links_add_target( $m ) {
5485      global $_links_add_target;
5486      $tag  = $m[1];
5487      $link = preg_replace( '|( target=([\'"])(.*?)\2)|i', '', $m[2] );
5488      return '<' . $tag . $link . ' target="' . esc_attr( $_links_add_target ) . '">';
5489  }
5490  
5491  /**
5492   * Normalizes EOL characters and strips duplicate whitespace.
5493   *
5494   * @since 2.7.0
5495   *
5496   * @param string $str The string to normalize.
5497   * @return string The normalized string.
5498   */
5499  function normalize_whitespace( $str ) {
5500      $str = trim( $str );
5501      $str = str_replace( "\r", "\n", $str );
5502      $str = preg_replace( array( '/\n+/', '/[ \t]+/' ), array( "\n", ' ' ), $str );
5503      return $str;
5504  }
5505  
5506  /**
5507   * Properly strips all HTML tags including 'script' and 'style'.
5508   *
5509   * This differs from strip_tags() because it removes the contents of
5510   * the `<script>` and `<style>` tags. E.g. `strip_tags( '<script>something</script>' )`
5511   * will return 'something'. wp_strip_all_tags() will return an empty string.
5512   *
5513   * @since 2.9.0
5514   *
5515   * @param string $text          String containing HTML tags
5516   * @param bool   $remove_breaks Optional. Whether to remove left over line breaks and white space chars
5517   * @return string The processed string.
5518   */
5519  function wp_strip_all_tags( $text, $remove_breaks = false ) {
5520      if ( is_null( $text ) ) {
5521          return '';
5522      }
5523  
5524      if ( ! is_scalar( $text ) ) {
5525          /*
5526           * To maintain consistency with pre-PHP 8 error levels,
5527           * wp_trigger_error() is used to trigger an E_USER_WARNING,
5528           * rather than _doing_it_wrong(), which triggers an E_USER_NOTICE.
5529           */
5530          wp_trigger_error(
5531              '',
5532              sprintf(
5533                  /* translators: 1: The function name, 2: The argument number, 3: The argument name, 4: The expected type, 5: The provided type. */
5534                  __( 'Warning: %1$s expects parameter %2$s (%3$s) to be a %4$s, %5$s given.' ),
5535                  __FUNCTION__,
5536                  '#1',
5537                  '$text',
5538                  'string',
5539                  gettype( $text )
5540              ),
5541              E_USER_WARNING
5542          );
5543  
5544          return '';
5545      }
5546  
5547      $text = preg_replace( '@<(script|style)[^>]*?>.*?</\\1>@si', '', $text );
5548      $text = strip_tags( $text );
5549  
5550      if ( $remove_breaks ) {
5551          $text = preg_replace( '/[\r\n\t ]+/', ' ', $text );
5552      }
5553  
5554      return trim( $text );
5555  }
5556  
5557  /**
5558   * Sanitizes a string from user input or from the database.
5559   *
5560   * - Checks for invalid UTF-8,
5561   * - Converts single `<` characters to entities
5562   * - Strips all tags
5563   * - Removes line breaks, tabs, and extra whitespace
5564   * - Strips percent-encoded characters
5565   *
5566   * @since 2.9.0
5567   *
5568   * @see sanitize_textarea_field()
5569   * @see wp_check_invalid_utf8()
5570   * @see wp_strip_all_tags()
5571   *
5572   * @param string $str String to sanitize.
5573   * @return string Sanitized string.
5574   */
5575  function sanitize_text_field( $str ) {
5576      $filtered = _sanitize_text_fields( $str, false );
5577  
5578      /**
5579       * Filters a sanitized text field string.
5580       *
5581       * @since 2.9.0
5582       *
5583       * @param string $filtered The sanitized string.
5584       * @param string $str      The string prior to being sanitized.
5585       */
5586      return apply_filters( 'sanitize_text_field', $filtered, $str );
5587  }
5588  
5589  /**
5590   * Sanitizes a multiline string from user input or from the database.
5591   *
5592   * The function is like sanitize_text_field(), but preserves
5593   * new lines (\n) and other whitespace, which are legitimate
5594   * input in textarea elements.
5595   *
5596   * @see sanitize_text_field()
5597   *
5598   * @since 4.7.0
5599   *
5600   * @param string $str String to sanitize.
5601   * @return string Sanitized string.
5602   */
5603  function sanitize_textarea_field( $str ) {
5604      $filtered = _sanitize_text_fields( $str, true );
5605  
5606      /**
5607       * Filters a sanitized textarea field string.
5608       *
5609       * @since 4.7.0
5610       *
5611       * @param string $filtered The sanitized string.
5612       * @param string $str      The string prior to being sanitized.
5613       */
5614      return apply_filters( 'sanitize_textarea_field', $filtered, $str );
5615  }
5616  
5617  /**
5618   * Internal helper function to sanitize a string from user input or from the database.
5619   *
5620   * @since 4.7.0
5621   * @access private
5622   *
5623   * @param string $str           String to sanitize.
5624   * @param bool   $keep_newlines Optional. Whether to keep newlines. Default: false.
5625   * @return string Sanitized string.
5626   */
5627  function _sanitize_text_fields( $str, $keep_newlines = false ) {
5628      if ( is_object( $str ) || is_array( $str ) ) {
5629          return '';
5630      }
5631  
5632      $str = (string) $str;
5633  
5634      $filtered = wp_check_invalid_utf8( $str );
5635  
5636      if ( str_contains( $filtered, '<' ) ) {
5637          $filtered = wp_pre_kses_less_than( $filtered );
5638          // This will strip extra whitespace for us.
5639          $filtered = wp_strip_all_tags( $filtered, false );
5640  
5641          /*
5642           * Use HTML entities in a special case to make sure that
5643           * later newline stripping stages cannot lead to a functional tag.
5644           */
5645          $filtered = str_replace( "<\n", "&lt;\n", $filtered );
5646      }
5647  
5648      if ( ! $keep_newlines ) {
5649          $filtered = preg_replace( '/[\r\n\t ]+/', ' ', $filtered );
5650      }
5651      $filtered = trim( $filtered );
5652  
5653      // Remove percent-encoded characters.
5654      $found = false;
5655      while ( preg_match( '/%[a-f0-9]{2}/i', $filtered, $match ) ) {
5656          $filtered = str_replace( $match[0], '', $filtered );
5657          $found    = true;
5658      }
5659  
5660      if ( $found ) {
5661          // Strip out the whitespace that may now exist after removing percent-encoded characters.
5662          $filtered = trim( preg_replace( '/ +/', ' ', $filtered ) );
5663      }
5664  
5665      return $filtered;
5666  }
5667  
5668  /**
5669   * i18n-friendly version of basename().
5670   *
5671   * @since 3.1.0
5672   *
5673   * @param string $path   A path.
5674   * @param string $suffix If the filename ends in suffix this will also be cut off.
5675   * @return string
5676   */
5677  function wp_basename( $path, $suffix = '' ) {
5678      return urldecode( basename( str_replace( array( '%2F', '%5C' ), '/', urlencode( $path ) ), $suffix ) );
5679  }
5680  
5681  // phpcs:disable WordPress.WP.CapitalPDangit.MisspelledInComment,WordPress.WP.CapitalPDangit.MisspelledInText,WordPress.NamingConventions.ValidFunctionName.FunctionNameInvalid -- 8-)
5682  /**
5683   * Forever eliminate "Wordpress" from the planet (or at least the little bit we can influence).
5684   *
5685   * Violating our coding standards for a good function name.
5686   *
5687   * @since 3.0.0
5688   *
5689   * @param string $text The text to be modified.
5690   * @return string The modified text.
5691   */
5692  function capital_P_dangit( $text ) {
5693      // Simple replacement for titles.
5694      $current_filter = current_filter();
5695      if ( 'the_title' === $current_filter || 'wp_title' === $current_filter ) {
5696          return str_replace( 'Wordpress', 'WordPress', $text );
5697      }
5698      // Still here? Use the more judicious replacement.
5699      static $dblq = false;
5700      if ( false === $dblq ) {
5701          $dblq = _x( '&#8220;', 'opening curly double quote' );
5702      }
5703      return str_replace(
5704          array( ' Wordpress', '&#8216;Wordpress', $dblq . 'Wordpress', '>Wordpress', '(Wordpress' ),
5705          array( ' WordPress', '&#8216;WordPress', $dblq . 'WordPress', '>WordPress', '(WordPress' ),
5706          $text
5707      );
5708  }
5709  // phpcs:enable
5710  
5711  /**
5712   * Sanitizes a mime type
5713   *
5714   * @since 3.1.3
5715   *
5716   * @param string $mime_type Mime type.
5717   * @return string Sanitized mime type.
5718   */
5719  function sanitize_mime_type( $mime_type ) {
5720      $sani_mime_type = preg_replace( '/[^-+*.a-zA-Z0-9\/]/', '', $mime_type );
5721      /**
5722       * Filters a mime type following sanitization.
5723       *
5724       * @since 3.1.3
5725       *
5726       * @param string $sani_mime_type The sanitized mime type.
5727       * @param string $mime_type      The mime type prior to sanitization.
5728       */
5729      return apply_filters( 'sanitize_mime_type', $sani_mime_type, $mime_type );
5730  }
5731  
5732  /**
5733   * Sanitizes space or carriage return separated URLs that are used to send trackbacks.
5734   *
5735   * @since 3.4.0
5736   *
5737   * @param string $to_ping Space or carriage return separated URLs
5738   * @return string URLs starting with the http or https protocol, separated by a carriage return.
5739   */
5740  function sanitize_trackback_urls( $to_ping ) {
5741      $urls_to_ping = preg_split( '/[\r\n\t ]/', trim( $to_ping ), -1, PREG_SPLIT_NO_EMPTY );
5742      foreach ( $urls_to_ping as $k => $url ) {
5743          if ( ! preg_match( '#^https?://.#i', $url ) ) {
5744              unset( $urls_to_ping[ $k ] );
5745          }
5746      }
5747      $urls_to_ping = array_map( 'sanitize_url', $urls_to_ping );
5748      $urls_to_ping = implode( "\n", $urls_to_ping );
5749      /**
5750       * Filters a list of trackback URLs following sanitization.
5751       *
5752       * The string returned here consists of a space or carriage return-delimited list
5753       * of trackback URLs.
5754       *
5755       * @since 3.4.0
5756       *
5757       * @param string $urls_to_ping Sanitized space or carriage return separated URLs.
5758       * @param string $to_ping      Space or carriage return separated URLs before sanitization.
5759       */
5760      return apply_filters( 'sanitize_trackback_urls', $urls_to_ping, $to_ping );
5761  }
5762  
5763  /**
5764   * Adds slashes to a string or recursively adds slashes to strings within an array.
5765   *
5766   * This should be used when preparing data for core API that expects slashed data.
5767   * This should not be used to escape data going directly into an SQL query.
5768   *
5769   * @since 3.6.0
5770   * @since 5.5.0 Non-string values are left untouched.
5771   *
5772   * @param string|array $value String or array of data to slash.
5773   * @return string|array Slashed `$value`, in the same type as supplied.
5774   */
5775  function wp_slash( $value ) {
5776      if ( is_array( $value ) ) {
5777          $value = array_map( 'wp_slash', $value );
5778      }
5779  
5780      if ( is_string( $value ) ) {
5781          return addslashes( $value );
5782      }
5783  
5784      return $value;
5785  }
5786  
5787  /**
5788   * Removes slashes from a string or recursively removes slashes from strings within an array.
5789   *
5790   * This should be used to remove slashes from data passed to core API that
5791   * expects data to be unslashed.
5792   *
5793   * @since 3.6.0
5794   *
5795   * @param string|array $value String or array of data to unslash.
5796   * @return string|array Unslashed `$value`, in the same type as supplied.
5797   */
5798  function wp_unslash( $value ) {
5799      return stripslashes_deep( $value );
5800  }
5801  
5802  /**
5803   * Extracts and returns the first URL from passed content.
5804   *
5805   * @since 3.6.0
5806   *
5807   * @param string $content A string which might contain a URL.
5808   * @return string|false The found URL.
5809   */
5810  function get_url_in_content( $content ) {
5811      if ( empty( $content ) ) {
5812          return false;
5813      }
5814  
5815      if ( preg_match( '/<a\s[^>]*?href=([\'"])(.+?)\1/is', $content, $matches ) ) {
5816          return sanitize_url( $matches[2] );
5817      }
5818  
5819      return false;
5820  }
5821  
5822  /**
5823   * Returns the regexp for common whitespace characters.
5824   *
5825   * By default, spaces include new lines, tabs, nbsp entities, and the UTF-8 nbsp.
5826   * This is designed to replace the PCRE \s sequence. In ticket #22692, that
5827   * sequence was found to be unreliable due to random inclusion of the A0 byte.
5828   *
5829   * @since 4.0.0
5830   *
5831   * @return string The spaces regexp.
5832   */
5833  function wp_spaces_regexp() {
5834      static $spaces = '';
5835  
5836      if ( empty( $spaces ) ) {
5837          /**
5838           * Filters the regexp for common whitespace characters.
5839           *
5840           * This string is substituted for the \s sequence as needed in regular
5841           * expressions. For websites not written in English, different characters
5842           * may represent whitespace. For websites not encoded in UTF-8, the 0xC2 0xA0
5843           * sequence may not be in use.
5844           *
5845           * @since 4.0.0
5846           *
5847           * @param string $spaces Regexp pattern for matching common whitespace characters.
5848           */
5849          $spaces = apply_filters( 'wp_spaces_regexp', '[\r\n\t ]|\xC2\xA0|&nbsp;' );
5850      }
5851  
5852      return $spaces;
5853  }
5854  
5855  /**
5856   * Enqueues the important emoji-related styles.
5857   *
5858   * @since 6.4.0
5859   */
5860  function wp_enqueue_emoji_styles() {
5861      // Back-compat for plugins that disable functionality by unhooking this action.
5862      $action = is_admin() ? 'admin_print_styles' : 'wp_print_styles';
5863      if ( ! has_action( $action, 'print_emoji_styles' ) ) {
5864          return;
5865      }
5866      remove_action( $action, 'print_emoji_styles' );
5867  
5868      $emoji_styles = '
5869      img.wp-smiley, img.emoji {
5870          display: inline !important;
5871          border: none !important;
5872          box-shadow: none !important;
5873          height: 1em !important;
5874          width: 1em !important;
5875          margin: 0 0.07em !important;
5876          vertical-align: -0.1em !important;
5877          background: none !important;
5878          padding: 0 !important;
5879      }';
5880      $handle       = 'wp-emoji-styles';
5881      wp_register_style( $handle, false );
5882      wp_add_inline_style( $handle, $emoji_styles );
5883      wp_enqueue_style( $handle );
5884  }
5885  
5886  /**
5887   * Prints the inline Emoji detection script if it is not already printed.
5888   *
5889   * @since 4.2.0
5890   */
5891  function print_emoji_detection_script() {
5892      static $printed = false;
5893  
5894      if ( $printed ) {
5895          return;
5896      }
5897  
5898      $printed = true;
5899  
5900      _print_emoji_detection_script();
5901  }
5902  
5903  /**
5904   * Prints inline Emoji detection script.
5905   *
5906   * @ignore
5907   * @since 4.6.0
5908   * @access private
5909   */
5910  function _print_emoji_detection_script() {
5911      $settings = array(
5912          /**
5913           * Filters the URL where emoji png images are hosted.
5914           *
5915           * @since 4.2.0
5916           *
5917           * @param string $url The emoji base URL for png images.
5918           */
5919          'baseUrl' => apply_filters( 'emoji_url', 'https://s.w.org/images/core/emoji/16.0.1/72x72/' ),
5920  
5921          /**
5922           * Filters the extension of the emoji png files.
5923           *
5924           * @since 4.2.0
5925           *
5926           * @param string $extension The emoji extension for png files. Default .png.
5927           */
5928          'ext'     => apply_filters( 'emoji_ext', '.png' ),
5929  
5930          /**
5931           * Filters the URL where emoji SVG images are hosted.
5932           *
5933           * @since 4.6.0
5934           *
5935           * @param string $url The emoji base URL for svg images.
5936           */
5937          'svgUrl'  => apply_filters( 'emoji_svg_url', 'https://s.w.org/images/core/emoji/16.0.1/svg/' ),
5938  
5939          /**
5940           * Filters the extension of the emoji SVG files.
5941           *
5942           * @since 4.6.0
5943           *
5944           * @param string $extension The emoji extension for svg files. Default .svg.
5945           */
5946          'svgExt'  => apply_filters( 'emoji_svg_ext', '.svg' ),
5947      );
5948  
5949      $version = 'ver=' . get_bloginfo( 'version' );
5950  
5951      if ( SCRIPT_DEBUG ) {
5952          $settings['source'] = array(
5953              /** This filter is documented in wp-includes/class-wp-scripts.php */
5954              'wpemoji' => apply_filters( 'script_loader_src', includes_url( "js/wp-emoji.js?$version" ), 'wpemoji' ),
5955              /** This filter is documented in wp-includes/class-wp-scripts.php */
5956              'twemoji' => apply_filters( 'script_loader_src', includes_url( "js/twemoji.js?$version" ), 'twemoji' ),
5957          );
5958      } else {
5959          $settings['source'] = array(
5960              /** This filter is documented in wp-includes/class-wp-scripts.php */
5961              'concatemoji' => apply_filters( 'script_loader_src', includes_url( "js/wp-emoji-release.min.js?$version" ), 'concatemoji' ),
5962          );
5963      }
5964  
5965      wp_print_inline_script_tag(
5966          sprintf( 'window._wpemojiSettings = %s;', wp_json_encode( $settings ) ) . "\n" .
5967              file_get_contents( ABSPATH . WPINC . '/js/wp-emoji-loader' . wp_scripts_get_suffix() . '.js' )
5968      );
5969  }
5970  
5971  /**
5972   * Converts emoji characters to their equivalent HTML entity.
5973   *
5974   * This allows us to store emoji in a DB using the utf8 character set.
5975   *
5976   * @since 4.2.0
5977   *
5978   * @param string $content The content to encode.
5979   * @return string The encoded content.
5980   */
5981  function wp_encode_emoji( $content ) {
5982      $emoji = _wp_emoji_list( 'partials' );
5983  
5984      foreach ( $emoji as $emojum ) {
5985          $emoji_char = html_entity_decode( $emojum );
5986          if ( str_contains( $content, $emoji_char ) ) {
5987              $content = preg_replace( "/$emoji_char/", $emojum, $content );
5988          }
5989      }
5990  
5991      return $content;
5992  }
5993  
5994  /**
5995   * Converts emoji to a static img element.
5996   *
5997   * @since 4.2.0
5998   *
5999   * @param string $text The content to encode.
6000   * @return string The encoded content.
6001   */
6002  function wp_staticize_emoji( $text ) {
6003      if ( ! str_contains( $text, '&#x' ) ) {
6004          if ( ( function_exists( 'mb_check_encoding' ) && mb_check_encoding( $text, 'ASCII' ) ) || ! preg_match( '/[^\x00-\x7F]/', $text ) ) {
6005              // The text doesn't contain anything that might be emoji, so we can return early.
6006              return $text;
6007          } else {
6008              $encoded_text = wp_encode_emoji( $text );
6009              if ( $encoded_text === $text ) {
6010                  return $encoded_text;
6011              }
6012  
6013              $text = $encoded_text;
6014          }
6015      }
6016  
6017      $emoji = _wp_emoji_list( 'entities' );
6018  
6019      // Quickly narrow down the list of emoji that might be in the text and need replacing.
6020      $possible_emoji = array();
6021      foreach ( $emoji as $emojum ) {
6022          if ( str_contains( $text, $emojum ) ) {
6023              $possible_emoji[ $emojum ] = html_entity_decode( $emojum );
6024          }
6025      }
6026  
6027      if ( ! $possible_emoji ) {
6028          return $text;
6029      }
6030  
6031      /** This filter is documented in wp-includes/formatting.php */
6032      $cdn_url = apply_filters( 'emoji_url', 'https://s.w.org/images/core/emoji/16.0.1/72x72/' );
6033  
6034      /** This filter is documented in wp-includes/formatting.php */
6035      $ext = apply_filters( 'emoji_ext', '.png' );
6036  
6037      $output = '';
6038      /*
6039       * HTML loop taken from smiley function, which was taken from texturize function.
6040       * It'll never be consolidated.
6041       *
6042       * First, capture the tags as well as in between.
6043       */
6044      $textarr = preg_split( '/(<.*>)/U', $text, -1, PREG_SPLIT_DELIM_CAPTURE );
6045      $stop    = count( $textarr );
6046  
6047      // Ignore processing of specific tags.
6048      $tags_to_ignore       = 'code|pre|style|script|textarea';
6049      $ignore_block_element = '';
6050  
6051      for ( $i = 0; $i < $stop; $i++ ) {
6052          $content = $textarr[ $i ];
6053  
6054          // If we're in an ignore block, wait until we find its closing tag.
6055          if ( '' === $ignore_block_element && preg_match( '/^<(' . $tags_to_ignore . ')>/', $content, $matches ) ) {
6056              $ignore_block_element = $matches[1];
6057          }
6058  
6059          // If it's not a tag and not in ignore block.
6060          if ( '' === $ignore_block_element && strlen( $content ) > 0 && '<' !== $content[0] && str_contains( $content, '&#x' ) ) {
6061              foreach ( $possible_emoji as $emojum => $emoji_char ) {
6062                  if ( ! str_contains( $content, $emojum ) ) {
6063                      continue;
6064                  }
6065  
6066                  $file = str_replace( ';&#x', '-', $emojum );
6067                  $file = str_replace( array( '&#x', ';' ), '', $file );
6068  
6069                  $entity = sprintf( '<img src="%s" alt="%s" class="wp-smiley" style="height: 1em; max-height: 1em;" />', $cdn_url . $file . $ext, $emoji_char );
6070  
6071                  $content = str_replace( $emojum, $entity, $content );
6072              }
6073          }
6074  
6075          // Did we exit ignore block?
6076          if ( '' !== $ignore_block_element && '</' . $ignore_block_element . '>' === $content ) {
6077              $ignore_block_element = '';
6078          }
6079  
6080          $output .= $content;
6081      }
6082  
6083      // Finally, remove any stray U+FE0F characters.
6084      $output = str_replace( '&#xfe0f;', '', $output );
6085  
6086      return $output;
6087  }
6088  
6089  /**
6090   * Converts emoji in emails into static images.
6091   *
6092   * @since 4.2.0
6093   *
6094   * @param array $mail The email data array.
6095   * @return array The email data array, with emoji in the message staticized.
6096   */
6097  function wp_staticize_emoji_for_email( $mail ) {
6098      if ( ! isset( $mail['message'] ) ) {
6099          return $mail;
6100      }
6101  
6102      /*
6103       * We can only transform the emoji into images if it's a `text/html` email.
6104       * To do that, here's a cut down version of the same process that happens
6105       * in wp_mail() - get the `Content-Type` from the headers, if there is one,
6106       * then pass it through the {@see 'wp_mail_content_type'} filter, in case
6107       * a plugin is handling changing the `Content-Type`.
6108       */
6109      $headers = array();
6110      if ( isset( $mail['headers'] ) ) {
6111          if ( is_array( $mail['headers'] ) ) {
6112              $headers = $mail['headers'];
6113          } else {
6114              $headers = explode( "\n", str_replace( "\r\n", "\n", $mail['headers'] ) );
6115          }
6116      }
6117  
6118      foreach ( $headers as $header ) {
6119          if ( ! str_contains( $header, ':' ) ) {
6120              continue;
6121          }
6122  
6123          // Explode them out.
6124          list( $name, $content ) = explode( ':', trim( $header ), 2 );
6125  
6126          // Cleanup crew.
6127          $name    = trim( $name );
6128          $content = trim( $content );
6129  
6130          if ( 'content-type' === strtolower( $name ) ) {
6131              if ( str_contains( $content, ';' ) ) {
6132                  list( $type, $charset ) = explode( ';', $content );
6133                  $content_type           = trim( $type );
6134              } else {
6135                  $content_type = trim( $content );
6136              }
6137              break;
6138          }
6139      }
6140  
6141      // Set Content-Type if we don't have a content-type from the input headers.
6142      if ( ! isset( $content_type ) ) {
6143          $content_type = 'text/plain';
6144      }
6145  
6146      /** This filter is documented in wp-includes/pluggable.php */
6147      $content_type = apply_filters( 'wp_mail_content_type', $content_type );
6148  
6149      if ( 'text/html' === $content_type ) {
6150          $mail['message'] = wp_staticize_emoji( $mail['message'] );
6151      }
6152  
6153      return $mail;
6154  }
6155  
6156  /**
6157   * Returns arrays of emoji data.
6158   *
6159   * These arrays are automatically built from the regex in twemoji.js - if they need to be updated,
6160   * you should update the regex there, then run the `npm run grunt precommit:emoji` job.
6161   *
6162   * @since 4.9.0
6163   * @access private
6164   *
6165   * @param string $type Optional. Which array type to return. Accepts 'partials' or 'entities', default 'entities'.
6166   * @return array An array to match all emoji that WordPress recognises.
6167   */
6168  function _wp_emoji_list( $type = 'entities' ) {
6169      // Do not remove the START/END comments - they're used to find where to insert the arrays.
6170  
6171      // START: emoji arrays
6172      $entities = array( '&#x1f468;&#x1f3fb;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fb;', '&#x1f468;&#x1f3fb;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fc;', '&#x1f468;&#x1f3fb;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fd;', '&#x1f468;&#x1f3fb;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fe;', '&#x1f468;&#x1f3fb;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3ff;', '&#x1f468;&#x1f3fc;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fb;', '&#x1f468;&#x1f3fc;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fc;', '&#x1f468;&#x1f3fc;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fd;', '&#x1f468;&#x1f3fc;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fe;', '&#x1f468;&#x1f3fc;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3ff;', '&#x1f468;&#x1f3fd;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fb;', '&#x1f468;&#x1f3fd;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fc;', '&#x1f468;&#x1f3fd;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fd;', '&#x1f468;&#x1f3fd;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fe;', '&#x1f468;&#x1f3fd;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3ff;', '&#x1f468;&#x1f3fe;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fb;', '&#x1f468;&#x1f3fe;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fc;', '&#x1f468;&#x1f3fe;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fd;', '&#x1f468;&#x1f3fe;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fe;', '&#x1f468;&#x1f3fe;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3ff;', '&#x1f468;&#x1f3ff;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fb;', '&#x1f468;&#x1f3ff;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fc;', '&#x1f468;&#x1f3ff;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fd;', '&#x1f468;&#x1f3ff;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fe;', '&#x1f468;&#x1f3ff;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3ff;', '&#x1f469;&#x1f3fb;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fb;', '&#x1f469;&#x1f3fb;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fc;', '&#x1f469;&#x1f3fb;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fd;', '&#x1f469;&#x1f3fb;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fe;', '&#x1f469;&#x1f3fb;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3ff;', '&#x1f469;&#x1f3fb;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f469;&#x1f3fb;', '&#x1f469;&#x1f3fb;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f469;&#x1f3fc;', '&#x1f469;&#x1f3fb;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f469;&#x1f3fd;', '&#x1f469;&#x1f3fb;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f469;&#x1f3fe;', '&#x1f469;&#x1f3fb;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f469;&#x1f3ff;', '&#x1f469;&#x1f3fc;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fb;', '&#x1f469;&#x1f3fc;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fc;', '&#x1f469;&#x1f3fc;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fd;', '&#x1f469;&#x1f3fc;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fe;', '&#x1f469;&#x1f3fc;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3ff;', '&#x1f469;&#x1f3fc;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f469;&#x1f3fb;', '&#x1f469;&#x1f3fc;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f469;&#x1f3fc;', '&#x1f469;&#x1f3fc;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f469;&#x1f3fd;', '&#x1f469;&#x1f3fc;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f469;&#x1f3fe;', '&#x1f469;&#x1f3fc;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f469;&#x1f3ff;', '&#x1f469;&#x1f3fd;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fb;', '&#x1f469;&#x1f3fd;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fc;', '&#x1f469;&#x1f3fd;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fd;', '&#x1f469;&#x1f3fd;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fe;', '&#x1f469;&#x1f3fd;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3ff;', '&#x1f469;&#x1f3fd;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f469;&#x1f3fb;', '&#x1f469;&#x1f3fd;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f469;&#x1f3fc;', '&#x1f469;&#x1f3fd;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f469;&#x1f3fd;', '&#x1f469;&#x1f3fd;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f469;&#x1f3fe;', '&#x1f469;&#x1f3fd;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f469;&#x1f3ff;', '&#x1f469;&#x1f3fe;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fb;', '&#x1f469;&#x1f3fe;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fc;', '&#x1f469;&#x1f3fe;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fd;', '&#x1f469;&#x1f3fe;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3fe;', '&#x1f469;&#x1f3fe;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f468;&#x1f3ff;', '&#x1f469;&#x1f3fe;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f469;&#x1f3fb;', '&#x1f469;&#x1f3fe;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f469;&#x1f3fc;', '&#x1f469;&#x1f3fe;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f469;&#x1f3fd;', '&#x1f469;&#x1f3fe;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f469;&#x1f3fe;', '&#x1f469;&#x1f3fe;&#x200d;&#x2764;&#xfe0f;&#x200d;&#x1f48b;&#x200d;&#x1f469;&#x1f3ff;', 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'&#x25fb;', '&#x25fc;', '&#x25fd;', '&#x25fe;', '&#x2600;', '&#x2601;', '&#x2602;', '&#x2603;', '&#x2604;', '&#x260e;', '&#x2611;', '&#x2614;', '&#x2615;', '&#x2618;', '&#x261d;', '&#x2622;', '&#x2623;', '&#x2626;', '&#x262a;', '&#x262e;', '&#x262f;', '&#x2638;', '&#x2639;', '&#x263a;', '&#x2648;', '&#x2649;', '&#x264a;', '&#x264b;', '&#x264c;', '&#x264d;', '&#x264e;', '&#x264f;', '&#x2650;', '&#x2651;', '&#x2652;', '&#x2653;', '&#x265f;', '&#x2660;', '&#x2663;', '&#x2665;', '&#x2666;', '&#x2668;', '&#x267b;', '&#x267e;', '&#x267f;', '&#x2692;', '&#x2693;', '&#x2694;', '&#x2697;', '&#x2699;', '&#x269b;', '&#x269c;', '&#x26a0;', '&#x26a1;', '&#x26aa;', '&#x26ab;', '&#x26b0;', '&#x26b1;', '&#x26bd;', '&#x26be;', '&#x26c4;', '&#x26c5;', '&#x26c8;', '&#x26ce;', '&#x26cf;', '&#x26d1;', '&#x26d3;', '&#x26d4;', '&#x26e9;', '&#x26ea;', '&#x26f0;', '&#x26f1;', '&#x26f2;', '&#x26f3;', '&#x26f4;', '&#x26f5;', '&#x26f7;', '&#x26f8;', '&#x26f9;', '&#x26fa;', '&#x26fd;', '&#x2702;', '&#x2705;', '&#x2709;', '&#x270a;', '&#x270b;', '&#x270c;', '&#x270d;', '&#x270f;', '&#x2712;', '&#x2714;', '&#x2716;', '&#x271d;', '&#x2721;', '&#x2728;', '&#x2733;', '&#x2734;', '&#x2747;', '&#x274c;', '&#x274e;', '&#x2753;', '&#x2754;', '&#x2755;', '&#x2757;', '&#x2763;', '&#x2795;', '&#x2796;', '&#x2797;', '&#x27b0;', '&#x27bf;', '&#x2934;', '&#x2935;', '&#x2b05;', '&#x2b06;', '&#x2b07;', '&#x2b1c;', '&#x2b50;', '&#x2b55;', '&#x3030;', '&#x303d;', '&#x3297;', '&#x3299;', '&#xe50a;' );
6174      // END: emoji arrays
6175  
6176      if ( 'entities' === $type ) {
6177          return $entities;
6178      }
6179  
6180      return $partials;
6181  }
6182  
6183  /**
6184   * Shortens a URL, to be used as link text.
6185   *
6186   * @since 1.2.0
6187   * @since 4.4.0 Moved to wp-includes/formatting.php from wp-admin/includes/misc.php and added $length param.
6188   *
6189   * @param string $url    URL to shorten.
6190   * @param int    $length Optional. Maximum length of the shortened URL. Default 35 characters.
6191   * @return string Shortened URL.
6192   */
6193  function url_shorten( $url, $length = 35 ) {
6194      $stripped  = str_replace( array( 'https://', 'http://', 'www.' ), '', $url );
6195      $short_url = untrailingslashit( $stripped );
6196  
6197      if ( strlen( $short_url ) > $length ) {
6198          $short_url = substr( $short_url, 0, $length - 3 ) . '&hellip;';
6199      }
6200      return $short_url;
6201  }
6202  
6203  /**
6204   * Sanitizes a hex color.
6205   *
6206   * Returns either '', a 3 or 6 digit hex color (with #), or nothing.
6207   * For sanitizing values without a #, see sanitize_hex_color_no_hash().
6208   *
6209   * @since 3.4.0
6210   *
6211   * @param string $color
6212   * @return string|void
6213   */
6214  function sanitize_hex_color( $color ) {
6215      if ( '' === $color ) {
6216          return '';
6217      }
6218  
6219      // 3 or 6 hex digits, or the empty string.
6220      if ( preg_match( '|^#([A-Fa-f0-9]{3}){1,2}$|', $color ) ) {
6221          return $color;
6222      }
6223  }
6224  
6225  /**
6226   * Sanitizes a hex color without a hash. Use sanitize_hex_color() when possible.
6227   *
6228   * Saving hex colors without a hash puts the burden of adding the hash on the
6229   * UI, which makes it difficult to use or upgrade to other color types such as
6230   * rgba, hsl, rgb, and HTML color names.
6231   *
6232   * Returns either '', a 3 or 6 digit hex color (without a #), or null.
6233   *
6234   * @since 3.4.0
6235   *
6236   * @param string $color
6237   * @return string|null
6238   */
6239  function sanitize_hex_color_no_hash( $color ) {
6240      $color = ltrim( $color, '#' );
6241  
6242      if ( '' === $color ) {
6243          return '';
6244      }
6245  
6246      return sanitize_hex_color( '#' . $color ) ? $color : null;
6247  }
6248  
6249  /**
6250   * Ensures that any hex color is properly hashed.
6251   * Otherwise, returns value untouched.
6252   *
6253   * This method should only be necessary if using sanitize_hex_color_no_hash().
6254   *
6255   * @since 3.4.0
6256   *
6257   * @param string $color
6258   * @return string
6259   */
6260  function maybe_hash_hex_color( $color ) {
6261      $unhashed = sanitize_hex_color_no_hash( $color );
6262      if ( $unhashed ) {
6263          return '#' . $unhashed;
6264      }
6265  
6266      return $color;
6267  }


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