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/wp-includes/ -> general-template.php (source)

   1  <?php
   2  /**
   3   * General template tags that can go anywhere in a template.
   4   *
   5   * @package WordPress
   6   * @subpackage Template
   7   */
   8  
   9  /**
  10   * Loads header template.
  11   *
  12   * Includes the header template for a theme or if a name is specified then a
  13   * specialized header will be included.
  14   *
  15   * For the parameter, if the file is called "header-special.php" then specify
  16   * "special".
  17   *
  18   * @since 1.5.0
  19   * @since 5.5.0 A return value was added.
  20   * @since 5.5.0 The `$args` parameter was added.
  21   *
  22   * @param string|null $name The name of the specialized header. Default null.
  23   * @param array       $args Optional. Additional arguments passed to the header template.
  24   *                          Default empty array.
  25   * @return void|false Void on success, false if the template does not exist.
  26   */
  27  function get_header( $name = null, $args = array() ) {
  28      /**
  29       * Fires before the header template file is loaded.
  30       *
  31       * @since 2.1.0
  32       * @since 2.8.0 The `$name` parameter was added.
  33       * @since 5.5.0 The `$args` parameter was added.
  34       *
  35       * @param string|null $name Name of the specific header file to use. Null for the default header.
  36       * @param array       $args Additional arguments passed to the header template.
  37       */
  38      do_action( 'get_header', $name, $args );
  39  
  40      $templates = array();
  41      $name      = (string) $name;
  42      if ( '' !== $name ) {
  43          $templates[] = "header-{$name}.php";
  44      }
  45  
  46      $templates[] = 'header.php';
  47  
  48      if ( ! locate_template( $templates, true, true, $args ) ) {
  49          return false;
  50      }
  51  }
  52  
  53  /**
  54   * Loads footer template.
  55   *
  56   * Includes the footer template for a theme or if a name is specified then a
  57   * specialized footer will be included.
  58   *
  59   * For the parameter, if the file is called "footer-special.php" then specify
  60   * "special".
  61   *
  62   * @since 1.5.0
  63   * @since 5.5.0 A return value was added.
  64   * @since 5.5.0 The `$args` parameter was added.
  65   *
  66   * @param string|null $name The name of the specialized footer. Default null.
  67   * @param array       $args Optional. Additional arguments passed to the footer template.
  68   *                          Default empty array.
  69   * @return void|false Void on success, false if the template does not exist.
  70   */
  71  function get_footer( $name = null, $args = array() ) {
  72      /**
  73       * Fires before the footer template file is loaded.
  74       *
  75       * @since 2.1.0
  76       * @since 2.8.0 The `$name` parameter was added.
  77       * @since 5.5.0 The `$args` parameter was added.
  78       *
  79       * @param string|null $name Name of the specific footer file to use. Null for the default footer.
  80       * @param array       $args Additional arguments passed to the footer template.
  81       */
  82      do_action( 'get_footer', $name, $args );
  83  
  84      $templates = array();
  85      $name      = (string) $name;
  86      if ( '' !== $name ) {
  87          $templates[] = "footer-{$name}.php";
  88      }
  89  
  90      $templates[] = 'footer.php';
  91  
  92      if ( ! locate_template( $templates, true, true, $args ) ) {
  93          return false;
  94      }
  95  }
  96  
  97  /**
  98   * Loads sidebar template.
  99   *
 100   * Includes the sidebar template for a theme or if a name is specified then a
 101   * specialized sidebar will be included.
 102   *
 103   * For the parameter, if the file is called "sidebar-special.php" then specify
 104   * "special".
 105   *
 106   * @since 1.5.0
 107   * @since 5.5.0 A return value was added.
 108   * @since 5.5.0 The `$args` parameter was added.
 109   *
 110   * @param string|null $name The name of the specialized sidebar. Default null.
 111   * @param array       $args Optional. Additional arguments passed to the sidebar template.
 112   *                          Default empty array.
 113   * @return void|false Void on success, false if the template does not exist.
 114   */
 115  function get_sidebar( $name = null, $args = array() ) {
 116      /**
 117       * Fires before the sidebar template file is loaded.
 118       *
 119       * @since 2.2.0
 120       * @since 2.8.0 The `$name` parameter was added.
 121       * @since 5.5.0 The `$args` parameter was added.
 122       *
 123       * @param string|null $name Name of the specific sidebar file to use. Null for the default sidebar.
 124       * @param array       $args Additional arguments passed to the sidebar template.
 125       */
 126      do_action( 'get_sidebar', $name, $args );
 127  
 128      $templates = array();
 129      $name      = (string) $name;
 130      if ( '' !== $name ) {
 131          $templates[] = "sidebar-{$name}.php";
 132      }
 133  
 134      $templates[] = 'sidebar.php';
 135  
 136      if ( ! locate_template( $templates, true, true, $args ) ) {
 137          return false;
 138      }
 139  }
 140  
 141  /**
 142   * Loads a template part into a template.
 143   *
 144   * Provides a simple mechanism for child themes to overload reusable sections of code
 145   * in the theme.
 146   *
 147   * Includes the named template part for a theme or if a name is specified then a
 148   * specialized part will be included. If the theme contains no {slug}.php file
 149   * then no template will be included.
 150   *
 151   * The template is included using require, not require_once, so you may include the
 152   * same template part multiple times.
 153   *
 154   * For the $name parameter, if the file is called "{slug}-special.php" then specify
 155   * "special".
 156   *
 157   * @since 3.0.0
 158   * @since 5.5.0 A return value was added.
 159   * @since 5.5.0 The `$args` parameter was added.
 160   *
 161   * @param string      $slug The slug name for the generic template.
 162   * @param string|null $name Optional. The name of the specialized template. Default null.
 163   * @param array       $args Optional. Additional arguments passed to the template.
 164   *                          Default empty array.
 165   * @return void|false Void on success, false if the template does not exist.
 166   */
 167  function get_template_part( $slug, $name = null, $args = array() ) {
 168      /**
 169       * Fires before the specified template part file is loaded.
 170       *
 171       * The dynamic portion of the hook name, `$slug`, refers to the slug name
 172       * for the generic template part.
 173       *
 174       * @since 3.0.0
 175       * @since 5.5.0 The `$args` parameter was added.
 176       *
 177       * @param string      $slug The slug name for the generic template.
 178       * @param string|null $name The name of the specialized template
 179       *                          or null if there is none.
 180       * @param array       $args Additional arguments passed to the template.
 181       */
 182      do_action( "get_template_part_{$slug}", $slug, $name, $args );
 183  
 184      $templates = array();
 185      $name      = (string) $name;
 186      if ( '' !== $name ) {
 187          $templates[] = "{$slug}-{$name}.php";
 188      }
 189  
 190      $templates[] = "{$slug}.php";
 191  
 192      /**
 193       * Fires before an attempt is made to locate and load a template part.
 194       *
 195       * @since 5.2.0
 196       * @since 5.5.0 The `$args` parameter was added.
 197       *
 198       * @param string   $slug      The slug name for the generic template.
 199       * @param string   $name      The name of the specialized template
 200       *                            or an empty string if there is none.
 201       * @param string[] $templates Array of template files to search for, in order.
 202       * @param array    $args      Additional arguments passed to the template.
 203       */
 204      do_action( 'get_template_part', $slug, $name, $templates, $args );
 205  
 206      if ( ! locate_template( $templates, true, false, $args ) ) {
 207          return false;
 208      }
 209  }
 210  
 211  /**
 212   * Displays search form.
 213   *
 214   * Will first attempt to locate the searchform.php file in either the child or
 215   * the parent, then load it. If it doesn't exist, then the default search form
 216   * will be displayed. The default search form is HTML, which will be displayed.
 217   * There is a filter applied to the search form HTML in order to edit or replace
 218   * it. The filter is {@see 'get_search_form'}.
 219   *
 220   * This function is primarily used by themes which want to hardcode the search
 221   * form into the sidebar and also by the search widget in WordPress.
 222   *
 223   * There is also an action that is called whenever the function is run called,
 224   * {@see 'pre_get_search_form'}. This can be useful for outputting JavaScript that the
 225   * search relies on or various formatting that applies to the beginning of the
 226   * search. To give a few examples of what it can be used for.
 227   *
 228   * @since 2.7.0
 229   * @since 5.2.0 The `$args` array parameter was added in place of an `$echo` boolean flag.
 230   *
 231   * @param array $args {
 232   *     Optional. Array of display arguments.
 233   *
 234   *     @type bool   $echo       Whether to echo or return the form. Default true.
 235   *     @type string $aria_label ARIA label for the search form. Useful to distinguish
 236   *                              multiple search forms on the same page and improve
 237   *                              accessibility. Default empty.
 238   * }
 239   * @return void|string Void if 'echo' argument is true, search form HTML if 'echo' is false.
 240   */
 241  function get_search_form( $args = array() ) {
 242      /**
 243       * Fires before the search form is retrieved, at the start of get_search_form().
 244       *
 245       * @since 2.7.0 as 'get_search_form' action.
 246       * @since 3.6.0
 247       * @since 5.5.0 The `$args` parameter was added.
 248       *
 249       * @link https://core.trac.wordpress.org/ticket/19321
 250       *
 251       * @param array $args The array of arguments for building the search form.
 252       *                    See get_search_form() for information on accepted arguments.
 253       */
 254      do_action( 'pre_get_search_form', $args );
 255  
 256      $echo = true;
 257  
 258      if ( ! is_array( $args ) ) {
 259          /*
 260           * Back compat: to ensure previous uses of get_search_form() continue to
 261           * function as expected, we handle a value for the boolean $echo param removed
 262           * in 5.2.0. Then we deal with the $args array and cast its defaults.
 263           */
 264          $echo = (bool) $args;
 265  
 266          // Set an empty array and allow default arguments to take over.
 267          $args = array();
 268      }
 269  
 270      // Defaults are to echo and to output no custom label on the form.
 271      $defaults = array(
 272          'echo'       => $echo,
 273          'aria_label' => '',
 274      );
 275  
 276      $args = wp_parse_args( $args, $defaults );
 277  
 278      /**
 279       * Filters the array of arguments used when generating the search form.
 280       *
 281       * @since 5.2.0
 282       *
 283       * @param array $args The array of arguments for building the search form.
 284       *                    See get_search_form() for information on accepted arguments.
 285       */
 286      $args = apply_filters( 'search_form_args', $args );
 287  
 288      // Ensure that the filtered arguments contain all required default values.
 289      $args = array_merge( $defaults, $args );
 290  
 291      $format = current_theme_supports( 'html5', 'search-form' ) ? 'html5' : 'xhtml';
 292  
 293      /**
 294       * Filters the HTML format of the search form.
 295       *
 296       * @since 3.6.0
 297       * @since 5.5.0 The `$args` parameter was added.
 298       *
 299       * @param string $format The type of markup to use in the search form.
 300       *                       Accepts 'html5', 'xhtml'.
 301       * @param array  $args   The array of arguments for building the search form.
 302       *                       See get_search_form() for information on accepted arguments.
 303       */
 304      $format = apply_filters( 'search_form_format', $format, $args );
 305  
 306      $search_form_template = locate_template( 'searchform.php' );
 307  
 308      if ( '' !== $search_form_template ) {
 309          ob_start();
 310          require $search_form_template;
 311          $form = ob_get_clean();
 312      } else {
 313          // Build a string containing an aria-label to use for the search form.
 314          if ( $args['aria_label'] ) {
 315              $aria_label = 'aria-label="' . esc_attr( $args['aria_label'] ) . '" ';
 316          } else {
 317              /*
 318               * If there's no custom aria-label, we can set a default here. At the
 319               * moment it's empty as there's uncertainty about what the default should be.
 320               */
 321              $aria_label = '';
 322          }
 323  
 324          if ( 'html5' === $format ) {
 325              $form = '<form role="search" ' . $aria_label . 'method="get" class="search-form" action="' . esc_url( home_url( '/' ) ) . '">
 326                  <label>
 327                      <span class="screen-reader-text">' .
 328                      /* translators: Hidden accessibility text. */
 329                      _x( 'Search for:', 'label' ) .
 330                      '</span>
 331                      <input type="search" class="search-field" placeholder="' . esc_attr_x( 'Search &hellip;', 'placeholder' ) . '" value="' . get_search_query() . '" name="s" />
 332                  </label>
 333                  <input type="submit" class="search-submit" value="' . esc_attr_x( 'Search', 'submit button' ) . '" />
 334              </form>';
 335          } else {
 336              $form = '<form role="search" ' . $aria_label . 'method="get" id="searchform" class="searchform" action="' . esc_url( home_url( '/' ) ) . '">
 337                  <div>
 338                      <label class="screen-reader-text" for="s">' .
 339                      /* translators: Hidden accessibility text. */
 340                      _x( 'Search for:', 'label' ) .
 341                      '</label>
 342                      <input type="text" value="' . get_search_query() . '" name="s" id="s" />
 343                      <input type="submit" id="searchsubmit" value="' . esc_attr_x( 'Search', 'submit button' ) . '" />
 344                  </div>
 345              </form>';
 346          }
 347      }
 348  
 349      /**
 350       * Filters the HTML output of the search form.
 351       *
 352       * @since 2.7.0
 353       * @since 5.5.0 The `$args` parameter was added.
 354       *
 355       * @param string $form The search form HTML output.
 356       * @param array  $args The array of arguments for building the search form.
 357       *                     See get_search_form() for information on accepted arguments.
 358       */
 359      $result = apply_filters( 'get_search_form', $form, $args );
 360  
 361      if ( null === $result ) {
 362          $result = $form;
 363      }
 364  
 365      if ( $args['echo'] ) {
 366          echo $result;
 367      } else {
 368          return $result;
 369      }
 370  }
 371  
 372  /**
 373   * Displays the Log In/Out link.
 374   *
 375   * Displays a link, which allows users to navigate to the Log In page to log in
 376   * or log out depending on whether they are currently logged in.
 377   *
 378   * @since 1.5.0
 379   *
 380   * @param string $redirect Optional path to redirect to on login/logout.
 381   * @param bool   $display  Default to echo and not return the link.
 382   * @return void|string Void if `$display` argument is true, log in/out link if `$display` is false.
 383   */
 384  function wp_loginout( $redirect = '', $display = true ) {
 385      if ( ! is_user_logged_in() ) {
 386          $link = '<a href="' . esc_url( wp_login_url( $redirect ) ) . '">' . __( 'Log in' ) . '</a>';
 387      } else {
 388          $link = '<a href="' . esc_url( wp_logout_url( $redirect ) ) . '">' . __( 'Log out' ) . '</a>';
 389      }
 390  
 391      if ( $display ) {
 392          /**
 393           * Filters the HTML output for the Log In/Log Out link.
 394           *
 395           * @since 1.5.0
 396           *
 397           * @param string $link The HTML link content.
 398           */
 399          echo apply_filters( 'loginout', $link );
 400      } else {
 401          /** This filter is documented in wp-includes/general-template.php */
 402          return apply_filters( 'loginout', $link );
 403      }
 404  }
 405  
 406  /**
 407   * Retrieves the logout URL.
 408   *
 409   * Returns the URL that allows the user to log out of the site.
 410   *
 411   * @since 2.7.0
 412   *
 413   * @param string $redirect Path to redirect to on logout.
 414   * @return string The logout URL. Note: HTML-encoded via esc_html() in wp_nonce_url().
 415   */
 416  function wp_logout_url( $redirect = '' ) {
 417      $args = array();
 418      if ( ! empty( $redirect ) ) {
 419          $args['redirect_to'] = urlencode( $redirect );
 420      }
 421  
 422      $logout_url = add_query_arg( $args, site_url( 'wp-login.php?action=logout', 'login' ) );
 423      $logout_url = wp_nonce_url( $logout_url, 'log-out' );
 424  
 425      /**
 426       * Filters the logout URL.
 427       *
 428       * @since 2.8.0
 429       *
 430       * @param string $logout_url The HTML-encoded logout URL.
 431       * @param string $redirect   Path to redirect to on logout.
 432       */
 433      return apply_filters( 'logout_url', $logout_url, $redirect );
 434  }
 435  
 436  /**
 437   * Retrieves the login URL.
 438   *
 439   * @since 2.7.0
 440   *
 441   * @param string $redirect     Path to redirect to on log in.
 442   * @param bool   $force_reauth Whether to force reauthorization, even if a cookie is present.
 443   *                             Default false.
 444   * @return string The login URL. Not HTML-encoded.
 445   */
 446  function wp_login_url( $redirect = '', $force_reauth = false ) {
 447      $login_url = site_url( 'wp-login.php', 'login' );
 448  
 449      if ( ! empty( $redirect ) ) {
 450          $login_url = add_query_arg( 'redirect_to', urlencode( $redirect ), $login_url );
 451      }
 452  
 453      if ( $force_reauth ) {
 454          $login_url = add_query_arg( 'reauth', '1', $login_url );
 455      }
 456  
 457      /**
 458       * Filters the login URL.
 459       *
 460       * @since 2.8.0
 461       * @since 4.2.0 The `$force_reauth` parameter was added.
 462       *
 463       * @param string $login_url    The login URL. Not HTML-encoded.
 464       * @param string $redirect     The path to redirect to on login, if supplied.
 465       * @param bool   $force_reauth Whether to force reauthorization, even if a cookie is present.
 466       */
 467      return apply_filters( 'login_url', $login_url, $redirect, $force_reauth );
 468  }
 469  
 470  /**
 471   * Returns the URL that allows the user to register on the site.
 472   *
 473   * @since 3.6.0
 474   *
 475   * @return string User registration URL.
 476   */
 477  function wp_registration_url() {
 478      /**
 479       * Filters the user registration URL.
 480       *
 481       * @since 3.6.0
 482       *
 483       * @param string $register The user registration URL.
 484       */
 485      return apply_filters( 'register_url', site_url( 'wp-login.php?action=register', 'login' ) );
 486  }
 487  
 488  /**
 489   * Provides a simple login form for use anywhere within WordPress.
 490   *
 491   * The login form HTML is echoed by default. Pass a false value for `$echo` to return it instead.
 492   *
 493   * @since 3.0.0
 494   * @since 6.6.0 Added `required_username` and `required_password` arguments.
 495   *
 496   * @param array $args {
 497   *     Optional. Array of options to control the form output. Default empty array.
 498   *
 499   *     @type bool   $echo              Whether to display the login form or return the form HTML code.
 500   *                                     Default true (echo).
 501   *     @type string $redirect          URL to redirect to. Must be absolute, as in "https://example.com/mypage/".
 502   *                                     Default is to redirect back to the request URI.
 503   *     @type string $form_id           ID attribute value for the form. Default 'loginform'.
 504   *     @type string $label_username    Label for the username or email address field. Default 'Username or Email Address'.
 505   *     @type string $label_password    Label for the password field. Default 'Password'.
 506   *     @type string $label_remember    Label for the remember field. Default 'Remember Me'.
 507   *     @type string $label_log_in      Label for the submit button. Default 'Log In'.
 508   *     @type string $id_username       ID attribute value for the username field. Default 'user_login'.
 509   *     @type string $id_password       ID attribute value for the password field. Default 'user_pass'.
 510   *     @type string $id_remember       ID attribute value for the remember field. Default 'rememberme'.
 511   *     @type string $id_submit         ID attribute value for the submit button. Default 'wp-submit'.
 512   *     @type bool   $remember          Whether to display the "rememberme" checkbox in the form.
 513   *     @type string $value_username    Default value for the username field. Default empty.
 514   *     @type bool   $value_remember    Whether the "Remember Me" checkbox should be checked by default.
 515   *                                     Default false (unchecked).
 516   *     @type bool   $required_username Whether the username field has the 'required' attribute.
 517   *                                     Default false.
 518   *     @type bool   $required_password Whether the password field has the 'required' attribute.
 519   *                                     Default false.
 520   *
 521   * }
 522   * @return void|string Void if 'echo' argument is true, login form HTML if 'echo' is false.
 523   */
 524  function wp_login_form( $args = array() ) {
 525      $defaults = array(
 526          'echo'              => true,
 527          // Default 'redirect' value takes the user back to the request URI.
 528          'redirect'          => ( is_ssl() ? 'https://' : 'http://' ) . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'],
 529          'form_id'           => 'loginform',
 530          'label_username'    => __( 'Username or Email Address' ),
 531          'label_password'    => __( 'Password' ),
 532          'label_remember'    => __( 'Remember Me' ),
 533          'label_log_in'      => __( 'Log In' ),
 534          'id_username'       => 'user_login',
 535          'id_password'       => 'user_pass',
 536          'id_remember'       => 'rememberme',
 537          'id_submit'         => 'wp-submit',
 538          'remember'          => true,
 539          'value_username'    => '',
 540          // Set 'value_remember' to true to default the "Remember me" checkbox to checked.
 541          'value_remember'    => false,
 542          // Set 'required_username' to true to add the required attribute to username field.
 543          'required_username' => false,
 544          // Set 'required_password' to true to add the required attribute to password field.
 545          'required_password' => false,
 546      );
 547  
 548      /**
 549       * Filters the default login form output arguments.
 550       *
 551       * @since 3.0.0
 552       *
 553       * @see wp_login_form()
 554       *
 555       * @param array $defaults An array of default login form arguments.
 556       */
 557      $args = wp_parse_args( $args, apply_filters( 'login_form_defaults', $defaults ) );
 558  
 559      /**
 560       * Filters content to display at the top of the login form.
 561       *
 562       * The filter evaluates just following the opening form tag element.
 563       *
 564       * @since 3.0.0
 565       *
 566       * @param string $content Content to display. Default empty.
 567       * @param array  $args    Array of login form arguments.
 568       */
 569      $login_form_top = apply_filters( 'login_form_top', '', $args );
 570  
 571      /**
 572       * Filters content to display in the middle of the login form.
 573       *
 574       * The filter evaluates just following the location where the 'login-password'
 575       * field is displayed.
 576       *
 577       * @since 3.0.0
 578       *
 579       * @param string $content Content to display. Default empty.
 580       * @param array  $args    Array of login form arguments.
 581       */
 582      $login_form_middle = apply_filters( 'login_form_middle', '', $args );
 583  
 584      /**
 585       * Filters content to display at the bottom of the login form.
 586       *
 587       * The filter evaluates just preceding the closing form tag element.
 588       *
 589       * @since 3.0.0
 590       *
 591       * @param string $content Content to display. Default empty.
 592       * @param array  $args    Array of login form arguments.
 593       */
 594      $login_form_bottom = apply_filters( 'login_form_bottom', '', $args );
 595  
 596      $form =
 597          sprintf(
 598              '<form name="%1$s" id="%1$s" action="%2$s" method="post">',
 599              esc_attr( $args['form_id'] ),
 600              esc_url( site_url( 'wp-login.php', 'login_post' ) )
 601          ) .
 602          $login_form_top .
 603          sprintf(
 604              '<p class="login-username">
 605                  <label for="%1$s">%2$s</label>
 606                  <input type="text" name="log" id="%1$s" autocomplete="username" class="input" value="%3$s" size="20"%4$s />
 607              </p>',
 608              esc_attr( $args['id_username'] ),
 609              esc_html( $args['label_username'] ),
 610              esc_attr( $args['value_username'] ),
 611              ( $args['required_username'] ? ' required="required"' : '' )
 612          ) .
 613          sprintf(
 614              '<p class="login-password">
 615                  <label for="%1$s">%2$s</label>
 616                  <input type="password" name="pwd" id="%1$s" autocomplete="current-password" spellcheck="false" class="input" value="" size="20"%3$s />
 617              </p>',
 618              esc_attr( $args['id_password'] ),
 619              esc_html( $args['label_password'] ),
 620              ( $args['required_password'] ? ' required="required"' : '' )
 621          ) .
 622          $login_form_middle .
 623          ( $args['remember'] ?
 624              sprintf(
 625                  '<p class="login-remember"><label><input name="rememberme" type="checkbox" id="%1$s" value="forever"%2$s /> %3$s</label></p>',
 626                  esc_attr( $args['id_remember'] ),
 627                  ( $args['value_remember'] ? ' checked="checked"' : '' ),
 628                  esc_html( $args['label_remember'] )
 629              ) : ''
 630          ) .
 631          sprintf(
 632              '<p class="login-submit">
 633                  <input type="submit" name="wp-submit" id="%1$s" class="button button-primary" value="%2$s" />
 634                  <input type="hidden" name="redirect_to" value="%3$s" />
 635              </p>',
 636              esc_attr( $args['id_submit'] ),
 637              esc_attr( $args['label_log_in'] ),
 638              esc_url( $args['redirect'] )
 639          ) .
 640          $login_form_bottom .
 641          '</form>';
 642  
 643      if ( $args['echo'] ) {
 644          echo $form;
 645      } else {
 646          return $form;
 647      }
 648  }
 649  
 650  /**
 651   * Returns the URL that allows the user to reset the lost password.
 652   *
 653   * @since 2.8.0
 654   *
 655   * @param string $redirect Path to redirect to on login.
 656   * @return string Lost password URL.
 657   */
 658  function wp_lostpassword_url( $redirect = '' ) {
 659      $args = array(
 660          'action' => 'lostpassword',
 661      );
 662  
 663      if ( ! empty( $redirect ) ) {
 664          $args['redirect_to'] = urlencode( $redirect );
 665      }
 666  
 667      if ( is_multisite() ) {
 668          $blog_details  = get_site();
 669          $wp_login_path = $blog_details->path . 'wp-login.php';
 670      } else {
 671          $wp_login_path = 'wp-login.php';
 672      }
 673  
 674      $lostpassword_url = add_query_arg( $args, network_site_url( $wp_login_path, 'login' ) );
 675  
 676      /**
 677       * Filters the Lost Password URL.
 678       *
 679       * @since 2.8.0
 680       *
 681       * @param string $lostpassword_url The lost password page URL.
 682       * @param string $redirect         The path to redirect to on login.
 683       */
 684      return apply_filters( 'lostpassword_url', $lostpassword_url, $redirect );
 685  }
 686  
 687  /**
 688   * Displays the Registration or Admin link.
 689   *
 690   * Display a link which allows the user to navigate to the registration page if
 691   * not logged in and registration is enabled or to the dashboard if logged in.
 692   *
 693   * @since 1.5.0
 694   *
 695   * @param string $before  Text to output before the link. Default `<li>`.
 696   * @param string $after   Text to output after the link. Default `</li>`.
 697   * @param bool   $display Default to echo and not return the link.
 698   * @return void|string Void if `$display` argument is true, registration or admin link
 699   *                     if `$display` is false.
 700   */
 701  function wp_register( $before = '<li>', $after = '</li>', $display = true ) {
 702      if ( ! is_user_logged_in() ) {
 703          if ( get_option( 'users_can_register' ) ) {
 704              $link = $before . '<a href="' . esc_url( wp_registration_url() ) . '">' . __( 'Register' ) . '</a>' . $after;
 705          } else {
 706              $link = '';
 707          }
 708      } elseif ( current_user_can( 'read' ) ) {
 709          $link = $before . '<a href="' . admin_url() . '">' . __( 'Site Admin' ) . '</a>' . $after;
 710      } else {
 711          $link = '';
 712      }
 713  
 714      /**
 715       * Filters the HTML link to the Registration or Admin page.
 716       *
 717       * Users are sent to the admin page if logged-in, or the registration page
 718       * if enabled and logged-out.
 719       *
 720       * @since 1.5.0
 721       *
 722       * @param string $link The HTML code for the link to the Registration or Admin page.
 723       */
 724      $link = apply_filters( 'register', $link );
 725  
 726      if ( $display ) {
 727          echo $link;
 728      } else {
 729          return $link;
 730      }
 731  }
 732  
 733  /**
 734   * Theme container function for the 'wp_meta' action.
 735   *
 736   * The {@see 'wp_meta'} action can have several purposes, depending on how you use it,
 737   * but one purpose might have been to allow for theme switching.
 738   *
 739   * @since 1.5.0
 740   *
 741   * @link https://core.trac.wordpress.org/ticket/1458 Explanation of 'wp_meta' action.
 742   */
 743  function wp_meta() {
 744      /**
 745       * Fires before displaying echoed content in the sidebar.
 746       *
 747       * @since 1.5.0
 748       */
 749      do_action( 'wp_meta' );
 750  }
 751  
 752  /**
 753   * Displays information about the current site.
 754   *
 755   * @since 0.71
 756   *
 757   * @see get_bloginfo() For possible `$show` values
 758   *
 759   * @param string $show Optional. Site information to display. Default empty.
 760   */
 761  function bloginfo( $show = '' ) {
 762      echo get_bloginfo( $show, 'display' );
 763  }
 764  
 765  /**
 766   * Retrieves information about the current site.
 767   *
 768   * Possible values for `$show` include:
 769   *
 770   * - 'name' - Site title (set in Settings > General)
 771   * - 'description' - Site tagline (set in Settings > General)
 772   * - 'wpurl' - The WordPress address (URL) (set in Settings > General)
 773   * - 'url' - The Site address (URL) (set in Settings > General)
 774   * - 'admin_email' - Admin email (set in Settings > General)
 775   * - 'charset' - The "Encoding for pages and feeds"  (set in Settings > Reading)
 776   * - 'version' - The current WordPress version
 777   * - 'html_type' - The Content-Type (default: "text/html"). Themes and plugins
 778   *   can override the default value using the {@see 'pre_option_html_type'} filter
 779   * - 'text_direction' - The text direction determined by the site's language. is_rtl()
 780   *   should be used instead
 781   * - 'language' - Language code for the current site
 782   * - 'stylesheet_url' - URL to the stylesheet for the active theme. An active child theme
 783   *   will take precedence over this value
 784   * - 'stylesheet_directory' - Directory path for the active theme.  An active child theme
 785   *   will take precedence over this value
 786   * - 'template_url' / 'template_directory' - URL of the active theme's directory. An active
 787   *   child theme will NOT take precedence over this value
 788   * - 'pingback_url' - The pingback XML-RPC file URL (xmlrpc.php)
 789   * - 'atom_url' - The Atom feed URL (/feed/atom)
 790   * - 'rdf_url' - The RDF/RSS 1.0 feed URL (/feed/rdf)
 791   * - 'rss_url' - The RSS 0.92 feed URL (/feed/rss)
 792   * - 'rss2_url' - The RSS 2.0 feed URL (/feed)
 793   * - 'comments_atom_url' - The comments Atom feed URL (/comments/feed)
 794   * - 'comments_rss2_url' - The comments RSS 2.0 feed URL (/comments/feed)
 795   *
 796   * Some `$show` values are deprecated and will be removed in future versions.
 797   * These options will trigger the _deprecated_argument() function.
 798   *
 799   * Deprecated arguments include:
 800   *
 801   * - 'siteurl' - Use 'url' instead
 802   * - 'home' - Use 'url' instead
 803   *
 804   * @since 0.71
 805   *
 806   * @global string $wp_version The WordPress version string.
 807   *
 808   * @param string $show   Optional. Site info to retrieve. Default empty (site name).
 809   * @param string $filter Optional. How to filter what is retrieved. Default 'raw'.
 810   * @return string Mostly string values, might be empty.
 811   */
 812  function get_bloginfo( $show = '', $filter = 'raw' ) {
 813      switch ( $show ) {
 814          case 'home':    // Deprecated.
 815          case 'siteurl': // Deprecated.
 816              _deprecated_argument(
 817                  __FUNCTION__,
 818                  '2.2.0',
 819                  sprintf(
 820                      /* translators: 1: 'siteurl'/'home' argument, 2: bloginfo() function name, 3: 'url' argument. */
 821                      __( 'The %1$s option is deprecated for the family of %2$s functions. Use the %3$s option instead.' ),
 822                      '<code>' . $show . '</code>',
 823                      '<code>bloginfo()</code>',
 824                      '<code>url</code>'
 825                  )
 826              );
 827              // Intentional fall-through to be handled by the 'url' case.
 828          case 'url':
 829              $output = home_url();
 830              break;
 831          case 'wpurl':
 832              $output = site_url();
 833              break;
 834          case 'description':
 835              $output = get_option( 'blogdescription' );
 836              break;
 837          case 'rdf_url':
 838              $output = get_feed_link( 'rdf' );
 839              break;
 840          case 'rss_url':
 841              $output = get_feed_link( 'rss' );
 842              break;
 843          case 'rss2_url':
 844              $output = get_feed_link( 'rss2' );
 845              break;
 846          case 'atom_url':
 847              $output = get_feed_link( 'atom' );
 848              break;
 849          case 'comments_atom_url':
 850              $output = get_feed_link( 'comments_atom' );
 851              break;
 852          case 'comments_rss2_url':
 853              $output = get_feed_link( 'comments_rss2' );
 854              break;
 855          case 'pingback_url':
 856              $output = site_url( 'xmlrpc.php' );
 857              break;
 858          case 'stylesheet_url':
 859              $output = get_stylesheet_uri();
 860              break;
 861          case 'stylesheet_directory':
 862              $output = get_stylesheet_directory_uri();
 863              break;
 864          case 'template_directory':
 865          case 'template_url':
 866              $output = get_template_directory_uri();
 867              break;
 868          case 'admin_email':
 869              $output = get_option( 'admin_email' );
 870              break;
 871          case 'charset':
 872              $output = get_option( 'blog_charset' );
 873              if ( '' === $output ) {
 874                  $output = 'UTF-8';
 875              }
 876              break;
 877          case 'html_type':
 878              $output = get_option( 'html_type' );
 879              break;
 880          case 'version':
 881              global $wp_version;
 882              $output = $wp_version;
 883              break;
 884          case 'language':
 885              /*
 886               * translators: Translate this to the correct language tag for your locale,
 887               * see https://www.w3.org/International/articles/language-tags/ for reference.
 888               * Do not translate into your own language.
 889               */
 890              $output = __( 'html_lang_attribute' );
 891              if ( 'html_lang_attribute' === $output || preg_match( '/[^a-zA-Z0-9-]/', $output ) ) {
 892                  $output = determine_locale();
 893                  $output = str_replace( '_', '-', $output );
 894              }
 895              break;
 896          case 'text_direction':
 897              _deprecated_argument(
 898                  __FUNCTION__,
 899                  '2.2.0',
 900                  sprintf(
 901                      /* translators: 1: 'text_direction' argument, 2: bloginfo() function name, 3: is_rtl() function name. */
 902                      __( 'The %1$s option is deprecated for the family of %2$s functions. Use the %3$s function instead.' ),
 903                      '<code>' . $show . '</code>',
 904                      '<code>bloginfo()</code>',
 905                      '<code>is_rtl()</code>'
 906                  )
 907              );
 908              if ( function_exists( 'is_rtl' ) ) {
 909                  $output = is_rtl() ? 'rtl' : 'ltr';
 910              } else {
 911                  $output = 'ltr';
 912              }
 913              break;
 914          case 'name':
 915          default:
 916              $output = get_option( 'blogname' );
 917              break;
 918      }
 919  
 920      if ( 'display' === $filter ) {
 921          if (
 922              str_contains( $show, 'url' )
 923              || str_contains( $show, 'directory' )
 924              || str_contains( $show, 'home' )
 925          ) {
 926              /**
 927               * Filters the URL returned by get_bloginfo().
 928               *
 929               * @since 2.0.5
 930               *
 931               * @param string $output The URL returned by bloginfo().
 932               * @param string $show   Type of information requested.
 933               */
 934              $output = apply_filters( 'bloginfo_url', $output, $show );
 935          } else {
 936              /**
 937               * Filters the site information returned by get_bloginfo().
 938               *
 939               * @since 0.71
 940               *
 941               * @param mixed  $output The requested non-URL site information.
 942               * @param string $show   Type of information requested.
 943               */
 944              $output = apply_filters( 'bloginfo', $output, $show );
 945          }
 946      }
 947  
 948      return $output;
 949  }
 950  
 951  /**
 952   * Returns the Site Icon URL.
 953   *
 954   * @since 4.3.0
 955   *
 956   * @param int    $size    Optional. Size of the site icon. Default 512 (pixels).
 957   * @param string $url     Optional. Fallback url if no site icon is found. Default empty.
 958   * @param int    $blog_id Optional. ID of the blog to get the site icon for. Default current blog.
 959   * @return string Site Icon URL.
 960   */
 961  function get_site_icon_url( $size = 512, $url = '', $blog_id = 0 ) {
 962      $switched_blog = false;
 963  
 964      if ( is_multisite() && ! empty( $blog_id ) && get_current_blog_id() !== (int) $blog_id ) {
 965          switch_to_blog( $blog_id );
 966          $switched_blog = true;
 967      }
 968  
 969      $site_icon_id = (int) get_option( 'site_icon' );
 970  
 971      if ( $site_icon_id ) {
 972          if ( $size >= 512 ) {
 973              $size_data = 'full';
 974          } else {
 975              $size_data = array( $size, $size );
 976          }
 977          $url = wp_get_attachment_image_url( $site_icon_id, $size_data );
 978      }
 979  
 980      if ( $switched_blog ) {
 981          restore_current_blog();
 982      }
 983  
 984      /**
 985       * Filters the site icon URL.
 986       *
 987       * @since 4.4.0
 988       *
 989       * @param string $url     Site icon URL.
 990       * @param int    $size    Size of the site icon.
 991       * @param int    $blog_id ID of the blog to get the site icon for.
 992       */
 993      return apply_filters( 'get_site_icon_url', $url, $size, $blog_id );
 994  }
 995  
 996  /**
 997   * Displays the Site Icon URL.
 998   *
 999   * @since 4.3.0
1000   *
1001   * @param int    $size    Optional. Size of the site icon. Default 512 (pixels).
1002   * @param string $url     Optional. Fallback url if no site icon is found. Default empty.
1003   * @param int    $blog_id Optional. ID of the blog to get the site icon for. Default current blog.
1004   */
1005  function site_icon_url( $size = 512, $url = '', $blog_id = 0 ) {
1006      echo esc_url( get_site_icon_url( $size, $url, $blog_id ) );
1007  }
1008  
1009  /**
1010   * Determines whether the site has a Site Icon.
1011   *
1012   * @since 4.3.0
1013   *
1014   * @param int $blog_id Optional. ID of the blog in question. Default current blog.
1015   * @return bool Whether the site has a site icon or not.
1016   */
1017  function has_site_icon( $blog_id = 0 ) {
1018      return (bool) get_site_icon_url( 512, '', $blog_id );
1019  }
1020  
1021  /**
1022   * Determines whether the site has a custom logo.
1023   *
1024   * @since 4.5.0
1025   *
1026   * @param int $blog_id Optional. ID of the blog in question. Default is the ID of the current blog.
1027   * @return bool Whether the site has a custom logo or not.
1028   */
1029  function has_custom_logo( $blog_id = 0 ) {
1030      $switched_blog = false;
1031  
1032      if ( is_multisite() && ! empty( $blog_id ) && get_current_blog_id() !== (int) $blog_id ) {
1033          switch_to_blog( $blog_id );
1034          $switched_blog = true;
1035      }
1036  
1037      $custom_logo_id = get_theme_mod( 'custom_logo' );
1038      $is_image       = ( $custom_logo_id ) ? wp_attachment_is_image( $custom_logo_id ) : false;
1039  
1040      if ( $switched_blog ) {
1041          restore_current_blog();
1042      }
1043  
1044      return $is_image;
1045  }
1046  
1047  /**
1048   * Returns a custom logo, linked to home unless the theme supports removing the link on the home page.
1049   *
1050   * @since 4.5.0
1051   * @since 5.5.0 Added option to remove the link on the home page with `unlink-homepage-logo` theme support
1052   *              for the `custom-logo` theme feature.
1053   * @since 5.5.1 Disabled lazy-loading by default.
1054   *
1055   * @param int $blog_id Optional. ID of the blog in question. Default is the ID of the current blog.
1056   * @return string Custom logo markup.
1057   */
1058  function get_custom_logo( $blog_id = 0 ) {
1059      $html          = '';
1060      $switched_blog = false;
1061  
1062      if ( is_multisite() && ! empty( $blog_id ) && get_current_blog_id() !== (int) $blog_id ) {
1063          switch_to_blog( $blog_id );
1064          $switched_blog = true;
1065      }
1066  
1067      // We have a logo. Logo is go.
1068      if ( has_custom_logo() ) {
1069          $custom_logo_id   = get_theme_mod( 'custom_logo' );
1070          $custom_logo_attr = array(
1071              'class'   => 'custom-logo',
1072              'loading' => false,
1073          );
1074  
1075          $unlink_homepage_logo = (bool) get_theme_support( 'custom-logo', 'unlink-homepage-logo' );
1076  
1077          if ( $unlink_homepage_logo && is_front_page() && ! is_paged() ) {
1078              /*
1079               * If on the home page, set the logo alt attribute to an empty string,
1080               * as the image is decorative and doesn't need its purpose to be described.
1081               */
1082              $custom_logo_attr['alt'] = '';
1083          } else {
1084              /*
1085               * If the logo alt attribute is empty, get the site title and explicitly pass it
1086               * to the attributes used by wp_get_attachment_image().
1087               */
1088              $image_alt = get_post_meta( $custom_logo_id, '_wp_attachment_image_alt', true );
1089              if ( empty( $image_alt ) ) {
1090                  $custom_logo_attr['alt'] = get_bloginfo( 'name', 'display' );
1091              }
1092          }
1093  
1094          /**
1095           * Filters the list of custom logo image attributes.
1096           *
1097           * @since 5.5.0
1098           *
1099           * @param array $custom_logo_attr Custom logo image attributes.
1100           * @param int   $custom_logo_id   Custom logo attachment ID.
1101           * @param int   $blog_id          ID of the blog to get the custom logo for.
1102           */
1103          $custom_logo_attr = apply_filters( 'get_custom_logo_image_attributes', $custom_logo_attr, $custom_logo_id, $blog_id );
1104  
1105          /*
1106           * If the alt attribute is not empty, there's no need to explicitly pass it
1107           * because wp_get_attachment_image() already adds the alt attribute.
1108           */
1109          $image = wp_get_attachment_image( $custom_logo_id, 'full', false, $custom_logo_attr );
1110  
1111          // Check that we have a proper HTML img element.
1112          if ( $image ) {
1113  
1114              if ( $unlink_homepage_logo && is_front_page() && ! is_paged() ) {
1115                  // If on the home page, don't link the logo to home.
1116                  $html = sprintf(
1117                      '<span class="custom-logo-link">%1$s</span>',
1118                      $image
1119                  );
1120              } else {
1121                  $aria_current = ! is_paged() && ( is_front_page() || is_home() && ( (int) get_option( 'page_for_posts' ) !== get_queried_object_id() ) ) ? ' aria-current="page"' : '';
1122  
1123                  $html = sprintf(
1124                      '<a href="%1$s" class="custom-logo-link" rel="home"%2$s>%3$s</a>',
1125                      esc_url( home_url( '/' ) ),
1126                      $aria_current,
1127                      $image
1128                  );
1129              }
1130          }
1131      } elseif ( is_customize_preview() ) {
1132          // If no logo is set but we're in the Customizer, leave a placeholder (needed for the live preview).
1133          $html = sprintf(
1134              '<a href="%1$s" class="custom-logo-link" style="display:none;"><img class="custom-logo" alt="" /></a>',
1135              esc_url( home_url( '/' ) )
1136          );
1137      }
1138  
1139      if ( $switched_blog ) {
1140          restore_current_blog();
1141      }
1142  
1143      /**
1144       * Filters the custom logo output.
1145       *
1146       * @since 4.5.0
1147       * @since 4.6.0 Added the `$blog_id` parameter.
1148       *
1149       * @param string $html    Custom logo HTML output.
1150       * @param int    $blog_id ID of the blog to get the custom logo for.
1151       */
1152      return apply_filters( 'get_custom_logo', $html, $blog_id );
1153  }
1154  
1155  /**
1156   * Displays a custom logo, linked to home unless the theme supports removing the link on the home page.
1157   *
1158   * @since 4.5.0
1159   *
1160   * @param int $blog_id Optional. ID of the blog in question. Default is the ID of the current blog.
1161   */
1162  function the_custom_logo( $blog_id = 0 ) {
1163      echo get_custom_logo( $blog_id );
1164  }
1165  
1166  /**
1167   * Returns document title for the current page.
1168   *
1169   * @since 4.4.0
1170   *
1171   * @global int $page  Page number of a single post.
1172   * @global int $paged Page number of a list of posts.
1173   *
1174   * @return string Tag with the document title.
1175   */
1176  function wp_get_document_title() {
1177  
1178      /**
1179       * Filters the document title before it is generated.
1180       *
1181       * Passing a non-empty value will short-circuit wp_get_document_title(),
1182       * returning that value instead.
1183       *
1184       * @since 4.4.0
1185       *
1186       * @param string $title The document title. Default empty string.
1187       */
1188      $title = apply_filters( 'pre_get_document_title', '' );
1189      if ( ! empty( $title ) ) {
1190          return $title;
1191      }
1192  
1193      global $page, $paged;
1194  
1195      $title = array(
1196          'title' => '',
1197      );
1198  
1199      // If it's a 404 page, use a "Page not found" title.
1200      if ( is_404() ) {
1201          $title['title'] = __( 'Page not found' );
1202  
1203          // If it's a search, use a dynamic search results title.
1204      } elseif ( is_search() ) {
1205          /* translators: %s: Search query. */
1206          $title['title'] = sprintf( __( 'Search Results for &#8220;%s&#8221;' ), get_search_query() );
1207  
1208          // If on the front page, use the site title.
1209      } elseif ( is_front_page() ) {
1210          $title['title'] = get_bloginfo( 'name', 'display' );
1211  
1212          // If on a post type archive, use the post type archive title.
1213      } elseif ( is_post_type_archive() ) {
1214          $title['title'] = post_type_archive_title( '', false );
1215  
1216          // If on a taxonomy archive, use the term title.
1217      } elseif ( is_tax() ) {
1218          $title['title'] = single_term_title( '', false );
1219  
1220          /*
1221          * If we're on the blog page that is not the homepage
1222          * or a single post of any post type, use the post title.
1223          */
1224      } elseif ( is_home() || is_singular() ) {
1225          $title['title'] = single_post_title( '', false );
1226  
1227          // If on a category or tag archive, use the term title.
1228      } elseif ( is_category() || is_tag() ) {
1229          $title['title'] = single_term_title( '', false );
1230  
1231          // If on an author archive, use the author's display name.
1232      } elseif ( is_author() && get_queried_object() ) {
1233          $author         = get_queried_object();
1234          $title['title'] = $author->display_name;
1235  
1236          // If it's a date archive, use the date as the title.
1237      } elseif ( is_year() ) {
1238          $title['title'] = get_the_date( _x( 'Y', 'yearly archives date format' ) );
1239  
1240      } elseif ( is_month() ) {
1241          $title['title'] = get_the_date( _x( 'F Y', 'monthly archives date format' ) );
1242  
1243      } elseif ( is_day() ) {
1244          $title['title'] = get_the_date();
1245      }
1246  
1247      // Add a page number if necessary.
1248      if ( ( $paged >= 2 || $page >= 2 ) && ! is_404() ) {
1249          /* translators: %s: Page number. */
1250          $title['page'] = sprintf( __( 'Page %s' ), max( $paged, $page ) );
1251      }
1252  
1253      // Append the description or site title to give context.
1254      if ( is_front_page() ) {
1255          $title['tagline'] = get_bloginfo( 'description', 'display' );
1256      } else {
1257          $title['site'] = get_bloginfo( 'name', 'display' );
1258      }
1259  
1260      /**
1261       * Filters the separator for the document title.
1262       *
1263       * @since 4.4.0
1264       *
1265       * @param string $sep Document title separator. Default '-'.
1266       */
1267      $sep = apply_filters( 'document_title_separator', '-' );
1268  
1269      /**
1270       * Filters the parts of the document title.
1271       *
1272       * @since 4.4.0
1273       *
1274       * @param array $title {
1275       *     The document title parts.
1276       *
1277       *     @type string $title   Title of the viewed page.
1278       *     @type string $page    Optional. Page number if paginated.
1279       *     @type string $tagline Optional. Site description when on home page.
1280       *     @type string $site    Optional. Site title when not on home page.
1281       * }
1282       */
1283      $title = apply_filters( 'document_title_parts', $title );
1284  
1285      $title = implode( " $sep ", array_filter( $title ) );
1286  
1287      /**
1288       * Filters the document title.
1289       *
1290       * @since 5.8.0
1291       *
1292       * @param string $title Document title.
1293       */
1294      $title = apply_filters( 'document_title', $title );
1295  
1296      return $title;
1297  }
1298  
1299  /**
1300   * Displays title tag with content.
1301   *
1302   * @since 4.1.0
1303   * @since 4.4.0 Improved title output replaced `wp_title()`.
1304   * @access private
1305   */
1306  function _wp_render_title_tag() {
1307      if ( ! current_theme_supports( 'title-tag' ) ) {
1308          return;
1309      }
1310  
1311      echo '<title>' . wp_get_document_title() . '</title>' . "\n";
1312  }
1313  
1314  /**
1315   * Displays or retrieves page title for all areas of blog.
1316   *
1317   * By default, the page title will display the separator before the page title,
1318   * so that the blog title will be before the page title. This is not good for
1319   * title display, since the blog title shows up on most tabs and not what is
1320   * important, which is the page that the user is looking at.
1321   *
1322   * There are also SEO benefits to having the blog title after or to the 'right'
1323   * of the page title. However, it is mostly common sense to have the blog title
1324   * to the right with most browsers supporting tabs. You can achieve this by
1325   * using the seplocation parameter and setting the value to 'right'. This change
1326   * was introduced around 2.5.0, in case backward compatibility of themes is
1327   * important.
1328   *
1329   * @since 1.0.0
1330   *
1331   * @global WP_Locale $wp_locale WordPress date and time locale object.
1332   *
1333   * @param string $sep         Optional. How to separate the various items within the page title.
1334   *                            Default '&raquo;'.
1335   * @param bool   $display     Optional. Whether to display or retrieve title. Default true.
1336   * @param string $seplocation Optional. Location of the separator (either 'left' or 'right').
1337   * @return string|void String when `$display` is false, nothing otherwise.
1338   */
1339  function wp_title( $sep = '&raquo;', $display = true, $seplocation = '' ) {
1340      global $wp_locale;
1341  
1342      $m        = get_query_var( 'm' );
1343      $year     = get_query_var( 'year' );
1344      $monthnum = get_query_var( 'monthnum' );
1345      $day      = get_query_var( 'day' );
1346      $search   = get_query_var( 's' );
1347      $title    = '';
1348  
1349      $t_sep = '%WP_TITLE_SEP%'; // Temporary separator, for accurate flipping, if necessary.
1350  
1351      // If there is a post.
1352      if ( is_single() || ( is_home() && ! is_front_page() ) || ( is_page() && ! is_front_page() ) ) {
1353          $title = single_post_title( '', false );
1354      }
1355  
1356      // If there's a post type archive.
1357      if ( is_post_type_archive() ) {
1358          $post_type = get_query_var( 'post_type' );
1359          if ( is_array( $post_type ) ) {
1360              $post_type = reset( $post_type );
1361          }
1362          $post_type_object = get_post_type_object( $post_type );
1363          if ( ! $post_type_object->has_archive ) {
1364              $title = post_type_archive_title( '', false );
1365          }
1366      }
1367  
1368      // If there's a category or tag.
1369      if ( is_category() || is_tag() ) {
1370          $title = single_term_title( '', false );
1371      }
1372  
1373      // If there's a taxonomy.
1374      if ( is_tax() ) {
1375          $term = get_queried_object();
1376          if ( $term ) {
1377              $tax   = get_taxonomy( $term->taxonomy );
1378              $title = single_term_title( $tax->labels->name . $t_sep, false );
1379          }
1380      }
1381  
1382      // If there's an author.
1383      if ( is_author() && ! is_post_type_archive() ) {
1384          $author = get_queried_object();
1385          if ( $author ) {
1386              $title = $author->display_name;
1387          }
1388      }
1389  
1390      // Post type archives with has_archive should override terms.
1391      if ( is_post_type_archive() && $post_type_object->has_archive ) {
1392          $title = post_type_archive_title( '', false );
1393      }
1394  
1395      // If there's a month.
1396      if ( is_archive() && ! empty( $m ) ) {
1397          $my_year  = substr( $m, 0, 4 );
1398          $my_month = substr( $m, 4, 2 );
1399          $my_day   = (int) substr( $m, 6, 2 );
1400          $title    = $my_year .
1401              ( $my_month ? $t_sep . $wp_locale->get_month( $my_month ) : '' ) .
1402              ( $my_day ? $t_sep . $my_day : '' );
1403      }
1404  
1405      // If there's a year.
1406      if ( is_archive() && ! empty( $year ) ) {
1407          $title = $year;
1408          if ( ! empty( $monthnum ) ) {
1409              $title .= $t_sep . $wp_locale->get_month( $monthnum );
1410          }
1411          if ( ! empty( $day ) ) {
1412              $title .= $t_sep . zeroise( $day, 2 );
1413          }
1414      }
1415  
1416      // If it's a search.
1417      if ( is_search() ) {
1418          /* translators: 1: Separator, 2: Search query. */
1419          $title = sprintf( __( 'Search Results %1$s %2$s' ), $t_sep, strip_tags( $search ) );
1420      }
1421  
1422      // If it's a 404 page.
1423      if ( is_404() ) {
1424          $title = __( 'Page not found' );
1425      }
1426  
1427      $prefix = '';
1428      if ( ! empty( $title ) ) {
1429          $prefix = " $sep ";
1430      }
1431  
1432      /**
1433       * Filters the parts of the page title.
1434       *
1435       * @since 4.0.0
1436       *
1437       * @param string[] $title_array Array of parts of the page title.
1438       */
1439      $title_array = apply_filters( 'wp_title_parts', explode( $t_sep, $title ) );
1440  
1441      // Determines position of the separator and direction of the breadcrumb.
1442      if ( 'right' === $seplocation ) { // Separator on right, so reverse the order.
1443          $title_array = array_reverse( $title_array );
1444          $title       = implode( " $sep ", $title_array ) . $prefix;
1445      } else {
1446          $title = $prefix . implode( " $sep ", $title_array );
1447      }
1448  
1449      /**
1450       * Filters the text of the page title.
1451       *
1452       * @since 2.0.0
1453       *
1454       * @param string $title       Page title.
1455       * @param string $sep         Title separator.
1456       * @param string $seplocation Location of the separator (either 'left' or 'right').
1457       */
1458      $title = apply_filters( 'wp_title', $title, $sep, $seplocation );
1459  
1460      // Send it out.
1461      if ( $display ) {
1462          echo $title;
1463      } else {
1464          return $title;
1465      }
1466  }
1467  
1468  /**
1469   * Displays or retrieves page title for post.
1470   *
1471   * This is optimized for single.php template file for displaying the post title.
1472   *
1473   * It does not support placing the separator after the title, but by leaving the
1474   * prefix parameter empty, you can set the title separator manually. The prefix
1475   * does not automatically place a space between the prefix, so if there should
1476   * be a space, the parameter value will need to have it at the end.
1477   *
1478   * @since 0.71
1479   *
1480   * @param string $prefix  Optional. What to display before the title.
1481   * @param bool   $display Optional. Whether to display or retrieve title. Default true.
1482   * @return string|void Title when retrieving.
1483   */
1484  function single_post_title( $prefix = '', $display = true ) {
1485      $_post = get_queried_object();
1486  
1487      if ( ! isset( $_post->post_title ) ) {
1488          return;
1489      }
1490  
1491      /**
1492       * Filters the page title for a single post.
1493       *
1494       * @since 0.71
1495       *
1496       * @param string  $_post_title The single post page title.
1497       * @param WP_Post $_post       The current post.
1498       */
1499      $title = apply_filters( 'single_post_title', $_post->post_title, $_post );
1500      if ( $display ) {
1501          echo $prefix . $title;
1502      } else {
1503          return $prefix . $title;
1504      }
1505  }
1506  
1507  /**
1508   * Displays or retrieves title for a post type archive.
1509   *
1510   * This is optimized for archive.php and archive-{$post_type}.php template files
1511   * for displaying the title of the post type.
1512   *
1513   * @since 3.1.0
1514   *
1515   * @param string $prefix  Optional. What to display before the title.
1516   * @param bool   $display Optional. Whether to display or retrieve title. Default true.
1517   * @return string|void Title when retrieving, null when displaying or failure.
1518   */
1519  function post_type_archive_title( $prefix = '', $display = true ) {
1520      if ( ! is_post_type_archive() ) {
1521          return;
1522      }
1523  
1524      $post_type = get_query_var( 'post_type' );
1525      if ( is_array( $post_type ) ) {
1526          $post_type = reset( $post_type );
1527      }
1528  
1529      $post_type_obj = get_post_type_object( $post_type );
1530  
1531      /**
1532       * Filters the post type archive title.
1533       *
1534       * @since 3.1.0
1535       *
1536       * @param string $post_type_name Post type 'name' label.
1537       * @param string $post_type      Post type.
1538       */
1539      $title = apply_filters( 'post_type_archive_title', $post_type_obj->labels->name, $post_type );
1540  
1541      if ( $display ) {
1542          echo $prefix . $title;
1543      } else {
1544          return $prefix . $title;
1545      }
1546  }
1547  
1548  /**
1549   * Displays or retrieves page title for category archive.
1550   *
1551   * Useful for category template files for displaying the category page title.
1552   * The prefix does not automatically place a space between the prefix, so if
1553   * there should be a space, the parameter value will need to have it at the end.
1554   *
1555   * @since 0.71
1556   *
1557   * @param string $prefix  Optional. What to display before the title.
1558   * @param bool   $display Optional. Whether to display or retrieve title. Default true.
1559   * @return string|void Title when retrieving.
1560   */
1561  function single_cat_title( $prefix = '', $display = true ) {
1562      return single_term_title( $prefix, $display );
1563  }
1564  
1565  /**
1566   * Displays or retrieves page title for tag post archive.
1567   *
1568   * Useful for tag template files for displaying the tag page title. The prefix
1569   * does not automatically place a space between the prefix, so if there should
1570   * be a space, the parameter value will need to have it at the end.
1571   *
1572   * @since 2.3.0
1573   *
1574   * @param string $prefix  Optional. What to display before the title.
1575   * @param bool   $display Optional. Whether to display or retrieve title. Default true.
1576   * @return string|void Title when retrieving.
1577   */
1578  function single_tag_title( $prefix = '', $display = true ) {
1579      return single_term_title( $prefix, $display );
1580  }
1581  
1582  /**
1583   * Displays or retrieves page title for taxonomy term archive.
1584   *
1585   * Useful for taxonomy term template files for displaying the taxonomy term page title.
1586   * The prefix does not automatically place a space between the prefix, so if there should
1587   * be a space, the parameter value will need to have it at the end.
1588   *
1589   * @since 3.1.0
1590   *
1591   * @param string $prefix  Optional. What to display before the title.
1592   * @param bool   $display Optional. Whether to display or retrieve title. Default true.
1593   * @return string|void Title when retrieving.
1594   */
1595  function single_term_title( $prefix = '', $display = true ) {
1596      $term = get_queried_object();
1597  
1598      if ( ! $term ) {
1599          return;
1600      }
1601  
1602      if ( is_category() ) {
1603          /**
1604           * Filters the category archive page title.
1605           *
1606           * @since 2.0.10
1607           *
1608           * @param string $term_name Category name for archive being displayed.
1609           */
1610          $term_name = apply_filters( 'single_cat_title', $term->name );
1611      } elseif ( is_tag() ) {
1612          /**
1613           * Filters the tag archive page title.
1614           *
1615           * @since 2.3.0
1616           *
1617           * @param string $term_name Tag name for archive being displayed.
1618           */
1619          $term_name = apply_filters( 'single_tag_title', $term->name );
1620      } elseif ( is_tax() ) {
1621          /**
1622           * Filters the custom taxonomy archive page title.
1623           *
1624           * @since 3.1.0
1625           *
1626           * @param string $term_name Term name for archive being displayed.
1627           */
1628          $term_name = apply_filters( 'single_term_title', $term->name );
1629      } else {
1630          return;
1631      }
1632  
1633      if ( empty( $term_name ) ) {
1634          return;
1635      }
1636  
1637      if ( $display ) {
1638          echo $prefix . $term_name;
1639      } else {
1640          return $prefix . $term_name;
1641      }
1642  }
1643  
1644  /**
1645   * Displays or retrieves page title for post archive based on date.
1646   *
1647   * Useful for when the template only needs to display the month and year,
1648   * if either are available. The prefix does not automatically place a space
1649   * between the prefix, so if there should be a space, the parameter value
1650   * will need to have it at the end.
1651   *
1652   * @since 0.71
1653   *
1654   * @global WP_Locale $wp_locale WordPress date and time locale object.
1655   *
1656   * @param string $prefix  Optional. What to display before the title.
1657   * @param bool   $display Optional. Whether to display or retrieve title. Default true.
1658   * @return string|false|void False if there's no valid title for the month. Title when retrieving.
1659   */
1660  function single_month_title( $prefix = '', $display = true ) {
1661      global $wp_locale;
1662  
1663      $m        = get_query_var( 'm' );
1664      $year     = get_query_var( 'year' );
1665      $monthnum = get_query_var( 'monthnum' );
1666  
1667      if ( ! empty( $monthnum ) && ! empty( $year ) ) {
1668          $my_year  = $year;
1669          $my_month = $wp_locale->get_month( $monthnum );
1670      } elseif ( ! empty( $m ) ) {
1671          $my_year  = substr( $m, 0, 4 );
1672          $my_month = $wp_locale->get_month( substr( $m, 4, 2 ) );
1673      }
1674  
1675      if ( empty( $my_month ) ) {
1676          return false;
1677      }
1678  
1679      $result = $prefix . $my_month . $prefix . $my_year;
1680  
1681      if ( ! $display ) {
1682          return $result;
1683      }
1684      echo $result;
1685  }
1686  
1687  /**
1688   * Displays the archive title based on the queried object.
1689   *
1690   * @since 4.1.0
1691   *
1692   * @see get_the_archive_title()
1693   *
1694   * @param string $before Optional. Content to prepend to the title. Default empty.
1695   * @param string $after  Optional. Content to append to the title. Default empty.
1696   */
1697  function the_archive_title( $before = '', $after = '' ) {
1698      $title = get_the_archive_title();
1699  
1700      if ( ! empty( $title ) ) {
1701          echo $before . $title . $after;
1702      }
1703  }
1704  
1705  /**
1706   * Retrieves the archive title based on the queried object.
1707   *
1708   * @since 4.1.0
1709   * @since 5.5.0 The title part is wrapped in a `<span>` element.
1710   *
1711   * @return string Archive title.
1712   */
1713  function get_the_archive_title() {
1714      $title  = __( 'Archives' );
1715      $prefix = '';
1716  
1717      if ( is_category() ) {
1718          $title  = single_cat_title( '', false );
1719          $prefix = _x( 'Category:', 'category archive title prefix' );
1720      } elseif ( is_tag() ) {
1721          $title  = single_tag_title( '', false );
1722          $prefix = _x( 'Tag:', 'tag archive title prefix' );
1723      } elseif ( is_author() ) {
1724          $title  = get_the_author();
1725          $prefix = _x( 'Author:', 'author archive title prefix' );
1726      } elseif ( is_year() ) {
1727          /* translators: See https://www.php.net/manual/datetime.format.php */
1728          $title  = get_the_date( _x( 'Y', 'yearly archives date format' ) );
1729          $prefix = _x( 'Year:', 'date archive title prefix' );
1730      } elseif ( is_month() ) {
1731          /* translators: See https://www.php.net/manual/datetime.format.php */
1732          $title  = get_the_date( _x( 'F Y', 'monthly archives date format' ) );
1733          $prefix = _x( 'Month:', 'date archive title prefix' );
1734      } elseif ( is_day() ) {
1735          /* translators: See https://www.php.net/manual/datetime.format.php */
1736          $title  = get_the_date( _x( 'F j, Y', 'daily archives date format' ) );
1737          $prefix = _x( 'Day:', 'date archive title prefix' );
1738      } elseif ( is_tax( 'post_format' ) ) {
1739          if ( is_tax( 'post_format', 'post-format-aside' ) ) {
1740              $title = _x( 'Asides', 'post format archive title' );
1741          } elseif ( is_tax( 'post_format', 'post-format-gallery' ) ) {
1742              $title = _x( 'Galleries', 'post format archive title' );
1743          } elseif ( is_tax( 'post_format', 'post-format-image' ) ) {
1744              $title = _x( 'Images', 'post format archive title' );
1745          } elseif ( is_tax( 'post_format', 'post-format-video' ) ) {
1746              $title = _x( 'Videos', 'post format archive title' );
1747          } elseif ( is_tax( 'post_format', 'post-format-quote' ) ) {
1748              $title = _x( 'Quotes', 'post format archive title' );
1749          } elseif ( is_tax( 'post_format', 'post-format-link' ) ) {
1750              $title = _x( 'Links', 'post format archive title' );
1751          } elseif ( is_tax( 'post_format', 'post-format-status' ) ) {
1752              $title = _x( 'Statuses', 'post format archive title' );
1753          } elseif ( is_tax( 'post_format', 'post-format-audio' ) ) {
1754              $title = _x( 'Audio', 'post format archive title' );
1755          } elseif ( is_tax( 'post_format', 'post-format-chat' ) ) {
1756              $title = _x( 'Chats', 'post format archive title' );
1757          }
1758      } elseif ( is_post_type_archive() ) {
1759          $title  = post_type_archive_title( '', false );
1760          $prefix = _x( 'Archives:', 'post type archive title prefix' );
1761      } elseif ( is_tax() ) {
1762          $queried_object = get_queried_object();
1763          if ( $queried_object ) {
1764              $tax    = get_taxonomy( $queried_object->taxonomy );
1765              $title  = single_term_title( '', false );
1766              $prefix = sprintf(
1767                  /* translators: %s: Taxonomy singular name. */
1768                  _x( '%s:', 'taxonomy term archive title prefix' ),
1769                  $tax->labels->singular_name
1770              );
1771          }
1772      }
1773  
1774      $original_title = $title;
1775  
1776      /**
1777       * Filters the archive title prefix.
1778       *
1779       * @since 5.5.0
1780       *
1781       * @param string $prefix Archive title prefix.
1782       */
1783      $prefix = apply_filters( 'get_the_archive_title_prefix', $prefix );
1784      if ( $prefix ) {
1785          $title = sprintf(
1786              /* translators: 1: Title prefix. 2: Title. */
1787              _x( '%1$s %2$s', 'archive title' ),
1788              $prefix,
1789              '<span>' . $title . '</span>'
1790          );
1791      }
1792  
1793      /**
1794       * Filters the archive title.
1795       *
1796       * @since 4.1.0
1797       * @since 5.5.0 Added the `$prefix` and `$original_title` parameters.
1798       *
1799       * @param string $title          Archive title to be displayed.
1800       * @param string $original_title Archive title without prefix.
1801       * @param string $prefix         Archive title prefix.
1802       */
1803      return apply_filters( 'get_the_archive_title', $title, $original_title, $prefix );
1804  }
1805  
1806  /**
1807   * Displays category, tag, term, or author description.
1808   *
1809   * @since 4.1.0
1810   *
1811   * @see get_the_archive_description()
1812   *
1813   * @param string $before Optional. Content to prepend to the description. Default empty.
1814   * @param string $after  Optional. Content to append to the description. Default empty.
1815   */
1816  function the_archive_description( $before = '', $after = '' ) {
1817      $description = get_the_archive_description();
1818      if ( $description ) {
1819          echo $before . $description . $after;
1820      }
1821  }
1822  
1823  /**
1824   * Retrieves the description for an author, post type, or term archive.
1825   *
1826   * @since 4.1.0
1827   * @since 4.7.0 Added support for author archives.
1828   * @since 4.9.0 Added support for post type archives.
1829   *
1830   * @see term_description()
1831   *
1832   * @return string Archive description.
1833   */
1834  function get_the_archive_description() {
1835      if ( is_author() ) {
1836          $description = get_the_author_meta( 'description' );
1837      } elseif ( is_post_type_archive() ) {
1838          $description = get_the_post_type_description();
1839      } else {
1840          $description = term_description();
1841      }
1842  
1843      /**
1844       * Filters the archive description.
1845       *
1846       * @since 4.1.0
1847       *
1848       * @param string $description Archive description to be displayed.
1849       */
1850      return apply_filters( 'get_the_archive_description', $description );
1851  }
1852  
1853  /**
1854   * Retrieves the description for a post type archive.
1855   *
1856   * @since 4.9.0
1857   *
1858   * @return string The post type description.
1859   */
1860  function get_the_post_type_description() {
1861      $post_type = get_query_var( 'post_type' );
1862  
1863      if ( is_array( $post_type ) ) {
1864          $post_type = reset( $post_type );
1865      }
1866  
1867      $post_type_obj = get_post_type_object( $post_type );
1868  
1869      // Check if a description is set.
1870      if ( isset( $post_type_obj->description ) ) {
1871          $description = $post_type_obj->description;
1872      } else {
1873          $description = '';
1874      }
1875  
1876      /**
1877       * Filters the description for a post type archive.
1878       *
1879       * @since 4.9.0
1880       *
1881       * @param string       $description   The post type description.
1882       * @param WP_Post_Type $post_type_obj The post type object.
1883       */
1884      return apply_filters( 'get_the_post_type_description', $description, $post_type_obj );
1885  }
1886  
1887  /**
1888   * Retrieves archive link content based on predefined or custom code.
1889   *
1890   * The format can be one of four styles. The 'link' for head element, 'option'
1891   * for use in the select element, 'html' for use in list (either ol or ul HTML
1892   * elements). Custom content is also supported using the before and after
1893   * parameters.
1894   *
1895   * The 'link' format uses the `<link>` HTML element with the **archives**
1896   * relationship. The before and after parameters are not used. The text
1897   * parameter is used to describe the link.
1898   *
1899   * The 'option' format uses the option HTML element for use in select element.
1900   * The value is the url parameter and the before and after parameters are used
1901   * between the text description.
1902   *
1903   * The 'html' format, which is the default, uses the li HTML element for use in
1904   * the list HTML elements. The before parameter is before the link and the after
1905   * parameter is after the closing link.
1906   *
1907   * The custom format uses the before parameter before the link ('a' HTML
1908   * element) and the after parameter after the closing link tag. If the above
1909   * three values for the format are not used, then custom format is assumed.
1910   *
1911   * @since 1.0.0
1912   * @since 5.2.0 Added the `$selected` parameter.
1913   *
1914   * @param string $url      URL to archive.
1915   * @param string $text     Archive text description.
1916   * @param string $format   Optional. Can be 'link', 'option', 'html', or custom. Default 'html'.
1917   * @param string $before   Optional. Content to prepend to the description. Default empty.
1918   * @param string $after    Optional. Content to append to the description. Default empty.
1919   * @param bool   $selected Optional. Set to true if the current page is the selected archive page. Default false.
1920   * @return string HTML link content for archive.
1921   */
1922  function get_archives_link( $url, $text, $format = 'html', $before = '', $after = '', $selected = false ) {
1923      $text         = wptexturize( $text );
1924      $url          = esc_url( $url );
1925      $aria_current = $selected ? ' aria-current="page"' : '';
1926  
1927      if ( 'link' === $format ) {
1928          $link_html = "\t<link rel='archives' title='" . esc_attr( $text ) . "' href='$url' />\n";
1929      } elseif ( 'option' === $format ) {
1930          $selected_attr = $selected ? " selected='selected'" : '';
1931          $link_html     = "\t<option value='$url'$selected_attr>$before $text $after</option>\n";
1932      } elseif ( 'html' === $format ) {
1933          $link_html = "\t<li>$before<a href='$url'$aria_current>$text</a>$after</li>\n";
1934      } else { // Custom.
1935          $link_html = "\t$before<a href='$url'$aria_current>$text</a>$after\n";
1936      }
1937  
1938      /**
1939       * Filters the archive link content.
1940       *
1941       * @since 2.6.0
1942       * @since 4.5.0 Added the `$url`, `$text`, `$format`, `$before`, and `$after` parameters.
1943       * @since 5.2.0 Added the `$selected` parameter.
1944       *
1945       * @param string $link_html The archive HTML link content.
1946       * @param string $url       URL to archive.
1947       * @param string $text      Archive text description.
1948       * @param string $format    Link format. Can be 'link', 'option', 'html', or custom.
1949       * @param string $before    Content to prepend to the description.
1950       * @param string $after     Content to append to the description.
1951       * @param bool   $selected  True if the current page is the selected archive.
1952       */
1953      return apply_filters( 'get_archives_link', $link_html, $url, $text, $format, $before, $after, $selected );
1954  }
1955  
1956  /**
1957   * Displays archive links based on type and format.
1958   *
1959   * @since 1.2.0
1960   * @since 4.4.0 The `$post_type` argument was added.
1961   * @since 5.2.0 The `$year`, `$monthnum`, `$day`, and `$w` arguments were added.
1962   *
1963   * @see get_archives_link()
1964   *
1965   * @global wpdb      $wpdb      WordPress database abstraction object.
1966   * @global WP_Locale $wp_locale WordPress date and time locale object.
1967   *
1968   * @param string|array $args {
1969   *     Default archive links arguments. Optional.
1970   *
1971   *     @type string     $type            Type of archive to retrieve. Accepts 'daily', 'weekly', 'monthly',
1972   *                                       'yearly', 'postbypost', or 'alpha'. Both 'postbypost' and 'alpha'
1973   *                                       display the same archive link list as well as post titles instead
1974   *                                       of displaying dates. The difference between the two is that 'alpha'
1975   *                                       will order by post title and 'postbypost' will order by post date.
1976   *                                       Default 'monthly'.
1977   *     @type string|int $limit           Number of links to limit the query to. Default empty (no limit).
1978   *     @type string     $format          Format each link should take using the $before and $after args.
1979   *                                       Accepts 'link' (`<link>` tag), 'option' (`<option>` tag), 'html'
1980   *                                       (`<li>` tag), or a custom format, which generates a link anchor
1981   *                                       with $before preceding and $after succeeding. Default 'html'.
1982   *     @type string     $before          Markup to prepend to the beginning of each link. Default empty.
1983   *     @type string     $after           Markup to append to the end of each link. Default empty.
1984   *     @type bool       $show_post_count Whether to display the post count alongside the link. Default false.
1985   *     @type bool|int   $echo            Whether to echo or return the links list. Default 1|true to echo.
1986   *     @type string     $order           Whether to use ascending or descending order. Accepts 'ASC', or 'DESC'.
1987   *                                       Default 'DESC'.
1988   *     @type string     $post_type       Post type. Default 'post'.
1989   *     @type string     $year            Year. Default current year.
1990   *     @type string     $monthnum        Month number. Default current month number.
1991   *     @type string     $day             Day. Default current day.
1992   *     @type string     $w               Week. Default current week.
1993   * }
1994   * @return void|string Void if 'echo' argument is true, archive links if 'echo' is false.
1995   */
1996  function wp_get_archives( $args = '' ) {
1997      global $wpdb, $wp_locale;
1998  
1999      $defaults = array(
2000          'type'            => 'monthly',
2001          'limit'           => '',
2002          'format'          => 'html',
2003          'before'          => '',
2004          'after'           => '',
2005          'show_post_count' => false,
2006          'echo'            => 1,
2007          'order'           => 'DESC',
2008          'post_type'       => 'post',
2009          'year'            => get_query_var( 'year' ),
2010          'monthnum'        => get_query_var( 'monthnum' ),
2011          'day'             => get_query_var( 'day' ),
2012          'w'               => get_query_var( 'w' ),
2013      );
2014  
2015      $parsed_args = wp_parse_args( $args, $defaults );
2016  
2017      $post_type_object = get_post_type_object( $parsed_args['post_type'] );
2018      if ( ! is_post_type_viewable( $post_type_object ) ) {
2019          return;
2020      }
2021  
2022      $parsed_args['post_type'] = $post_type_object->name;
2023  
2024      if ( '' === $parsed_args['type'] ) {
2025          $parsed_args['type'] = 'monthly';
2026      }
2027  
2028      if ( ! empty( $parsed_args['limit'] ) ) {
2029          $parsed_args['limit'] = absint( $parsed_args['limit'] );
2030          $parsed_args['limit'] = ' LIMIT ' . $parsed_args['limit'];
2031      }
2032  
2033      $order = strtoupper( $parsed_args['order'] );
2034      if ( 'ASC' !== $order ) {
2035          $order = 'DESC';
2036      }
2037  
2038      // This is what will separate dates on weekly archive links.
2039      $archive_week_separator = '&#8211;';
2040  
2041      $sql_where = $wpdb->prepare( "WHERE post_type = %s AND post_status = 'publish'", $parsed_args['post_type'] );
2042  
2043      /**
2044       * Filters the SQL WHERE clause for retrieving archives.
2045       *
2046       * @since 2.2.0
2047       *
2048       * @param string $sql_where   Portion of SQL query containing the WHERE clause.
2049       * @param array  $parsed_args An array of default arguments.
2050       */
2051      $where = apply_filters( 'getarchives_where', $sql_where, $parsed_args );
2052  
2053      /**
2054       * Filters the SQL JOIN clause for retrieving archives.
2055       *
2056       * @since 2.2.0
2057       *
2058       * @param string $sql_join    Portion of SQL query containing JOIN clause.
2059       * @param array  $parsed_args An array of default arguments.
2060       */
2061      $join = apply_filters( 'getarchives_join', '', $parsed_args );
2062  
2063      $output = '';
2064  
2065      $last_changed = wp_cache_get_last_changed( 'posts' );
2066  
2067      $limit = $parsed_args['limit'];
2068  
2069      if ( 'monthly' === $parsed_args['type'] ) {
2070          $query   = "SELECT YEAR(post_date) AS `year`, MONTH(post_date) AS `month`, count(ID) as posts FROM $wpdb->posts $join $where GROUP BY YEAR(post_date), MONTH(post_date) ORDER BY post_date $order $limit";
2071          $key     = md5( $query );
2072          $key     = "wp_get_archives:$key:$last_changed";
2073          $results = wp_cache_get( $key, 'post-queries' );
2074          if ( ! $results ) {
2075              $results = $wpdb->get_results( $query );
2076              wp_cache_set( $key, $results, 'post-queries' );
2077          }
2078          if ( $results ) {
2079              $after = $parsed_args['after'];
2080              foreach ( (array) $results as $result ) {
2081                  $url = get_month_link( $result->year, $result->month );
2082                  if ( 'post' !== $parsed_args['post_type'] ) {
2083                      $url = add_query_arg( 'post_type', $parsed_args['post_type'], $url );
2084                  }
2085                  /* translators: 1: Month name, 2: 4-digit year. */
2086                  $text = sprintf( __( '%1$s %2$d' ), $wp_locale->get_month( $result->month ), $result->year );
2087                  if ( $parsed_args['show_post_count'] ) {
2088                      $parsed_args['after'] = '&nbsp;(' . $result->posts . ')' . $after;
2089                  }
2090                  $selected = is_archive() && (string) $parsed_args['year'] === $result->year && (string) $parsed_args['monthnum'] === $result->month;
2091                  $output  .= get_archives_link( $url, $text, $parsed_args['format'], $parsed_args['before'], $parsed_args['after'], $selected );
2092              }
2093          }
2094      } elseif ( 'yearly' === $parsed_args['type'] ) {
2095          $query   = "SELECT YEAR(post_date) AS `year`, count(ID) as posts FROM $wpdb->posts $join $where GROUP BY YEAR(post_date) ORDER BY post_date $order $limit";
2096          $key     = md5( $query );
2097          $key     = "wp_get_archives:$key:$last_changed";
2098          $results = wp_cache_get( $key, 'post-queries' );
2099          if ( ! $results ) {
2100              $results = $wpdb->get_results( $query );
2101              wp_cache_set( $key, $results, 'post-queries' );
2102          }
2103          if ( $results ) {
2104              $after = $parsed_args['after'];
2105              foreach ( (array) $results as $result ) {
2106                  $url = get_year_link( $result->year );
2107                  if ( 'post' !== $parsed_args['post_type'] ) {
2108                      $url = add_query_arg( 'post_type', $parsed_args['post_type'], $url );
2109                  }
2110                  $text = sprintf( '%d', $result->year );
2111                  if ( $parsed_args['show_post_count'] ) {
2112                      $parsed_args['after'] = '&nbsp;(' . $result->posts . ')' . $after;
2113                  }
2114                  $selected = is_archive() && (string) $parsed_args['year'] === $result->year;
2115                  $output  .= get_archives_link( $url, $text, $parsed_args['format'], $parsed_args['before'], $parsed_args['after'], $selected );
2116              }
2117          }
2118      } elseif ( 'daily' === $parsed_args['type'] ) {
2119          $query   = "SELECT YEAR(post_date) AS `year`, MONTH(post_date) AS `month`, DAYOFMONTH(post_date) AS `dayofmonth`, count(ID) as posts FROM $wpdb->posts $join $where GROUP BY YEAR(post_date), MONTH(post_date), DAYOFMONTH(post_date) ORDER BY post_date $order $limit";
2120          $key     = md5( $query );
2121          $key     = "wp_get_archives:$key:$last_changed";
2122          $results = wp_cache_get( $key, 'post-queries' );
2123          if ( ! $results ) {
2124              $results = $wpdb->get_results( $query );
2125              wp_cache_set( $key, $results, 'post-queries' );
2126          }
2127          if ( $results ) {
2128              $after = $parsed_args['after'];
2129              foreach ( (array) $results as $result ) {
2130                  $url = get_day_link( $result->year, $result->month, $result->dayofmonth );
2131                  if ( 'post' !== $parsed_args['post_type'] ) {
2132                      $url = add_query_arg( 'post_type', $parsed_args['post_type'], $url );
2133                  }
2134                  $date = sprintf( '%1$d-%2$02d-%3$02d 00:00:00', $result->year, $result->month, $result->dayofmonth );
2135                  $text = mysql2date( get_option( 'date_format' ), $date );
2136                  if ( $parsed_args['show_post_count'] ) {
2137                      $parsed_args['after'] = '&nbsp;(' . $result->posts . ')' . $after;
2138                  }
2139                  $selected = is_archive() && (string) $parsed_args['year'] === $result->year && (string) $parsed_args['monthnum'] === $result->month && (string) $parsed_args['day'] === $result->dayofmonth;
2140                  $output  .= get_archives_link( $url, $text, $parsed_args['format'], $parsed_args['before'], $parsed_args['after'], $selected );
2141              }
2142          }
2143      } elseif ( 'weekly' === $parsed_args['type'] ) {
2144          $week    = _wp_mysql_week( '`post_date`' );
2145          $query   = "SELECT DISTINCT $week AS `week`, YEAR( `post_date` ) AS `yr`, DATE_FORMAT( `post_date`, '%Y-%m-%d' ) AS `yyyymmdd`, count( `ID` ) AS `posts` FROM `$wpdb->posts` $join $where GROUP BY $week, YEAR( `post_date` ) ORDER BY `post_date` $order $limit";
2146          $key     = md5( $query );
2147          $key     = "wp_get_archives:$key:$last_changed";
2148          $results = wp_cache_get( $key, 'post-queries' );
2149          if ( ! $results ) {
2150              $results = $wpdb->get_results( $query );
2151              wp_cache_set( $key, $results, 'post-queries' );
2152          }
2153          $arc_w_last = '';
2154          if ( $results ) {
2155              $after = $parsed_args['after'];
2156              foreach ( (array) $results as $result ) {
2157                  if ( $result->week !== $arc_w_last ) {
2158                      $arc_year       = $result->yr;
2159                      $arc_w_last     = $result->week;
2160                      $arc_week       = get_weekstartend( $result->yyyymmdd, get_option( 'start_of_week' ) );
2161                      $arc_week_start = date_i18n( get_option( 'date_format' ), $arc_week['start'] );
2162                      $arc_week_end   = date_i18n( get_option( 'date_format' ), $arc_week['end'] );
2163                      $url            = add_query_arg(
2164                          array(
2165                              'm' => $arc_year,
2166                              'w' => $result->week,
2167                          ),
2168                          home_url( '/' )
2169                      );
2170                      if ( 'post' !== $parsed_args['post_type'] ) {
2171                          $url = add_query_arg( 'post_type', $parsed_args['post_type'], $url );
2172                      }
2173                      $text = $arc_week_start . $archive_week_separator . $arc_week_end;
2174                      if ( $parsed_args['show_post_count'] ) {
2175                          $parsed_args['after'] = '&nbsp;(' . $result->posts . ')' . $after;
2176                      }
2177                      $selected = is_archive() && (string) $parsed_args['year'] === $result->yr && (string) $parsed_args['w'] === $result->week;
2178                      $output  .= get_archives_link( $url, $text, $parsed_args['format'], $parsed_args['before'], $parsed_args['after'], $selected );
2179                  }
2180              }
2181          }
2182      } elseif ( ( 'postbypost' === $parsed_args['type'] ) || ( 'alpha' === $parsed_args['type'] ) ) {
2183          $orderby = ( 'alpha' === $parsed_args['type'] ) ? 'post_title ASC ' : 'post_date DESC, ID DESC ';
2184          $query   = "SELECT * FROM $wpdb->posts $join $where ORDER BY $orderby $limit";
2185          $key     = md5( $query );
2186          $key     = "wp_get_archives:$key:$last_changed";
2187          $results = wp_cache_get( $key, 'post-queries' );
2188          if ( ! $results ) {
2189              $results = $wpdb->get_results( $query );
2190              wp_cache_set( $key, $results, 'post-queries' );
2191          }
2192          if ( $results ) {
2193              foreach ( (array) $results as $result ) {
2194                  if ( '0000-00-00 00:00:00' !== $result->post_date ) {
2195                      $url = get_permalink( $result );
2196                      if ( $result->post_title ) {
2197                          /** This filter is documented in wp-includes/post-template.php */
2198                          $text = strip_tags( apply_filters( 'the_title', $result->post_title, $result->ID ) );
2199                      } else {
2200                          $text = $result->ID;
2201                      }
2202                      $selected = get_the_ID() === $result->ID;
2203                      $output  .= get_archives_link( $url, $text, $parsed_args['format'], $parsed_args['before'], $parsed_args['after'], $selected );
2204                  }
2205              }
2206          }
2207      }
2208  
2209      if ( $parsed_args['echo'] ) {
2210          echo $output;
2211      } else {
2212          return $output;
2213      }
2214  }
2215  
2216  /**
2217   * Gets number of days since the start of the week.
2218   *
2219   * @since 1.5.0
2220   *
2221   * @param int $num Number of day.
2222   * @return float Days since the start of the week.
2223   */
2224  function calendar_week_mod( $num ) {
2225      $base = 7;
2226      return ( $num - $base * floor( $num / $base ) );
2227  }
2228  
2229  /**
2230   * Displays calendar with days that have posts as links.
2231   *
2232   * The calendar is cached, which will be retrieved, if it exists. If there are
2233   * no posts for the month, then it will not be displayed.
2234   *
2235   * @since 1.0.0
2236   * @since 6.8.0 Added the `$args` parameter, with backward compatibility
2237   *              for the replaced `$initial` and `$display` parameters.
2238   *
2239   * @global wpdb      $wpdb      WordPress database abstraction object.
2240   * @global int       $m
2241   * @global int       $monthnum
2242   * @global int       $year
2243   * @global WP_Locale $wp_locale WordPress date and time locale object.
2244   * @global array     $posts
2245   *
2246   * @param array $args {
2247   *     Optional. Arguments for the `get_calendar` function.
2248   *
2249   *     @type bool   $initial   Whether to use initial calendar names. Default true.
2250   *     @type bool   $display   Whether to display the calendar output. Default true.
2251   *     @type string $post_type Optional. Post type. Default 'post'.
2252   * }
2253   * @return void|string Void if `$display` argument is true, calendar HTML if `$display` is false.
2254   */
2255  function get_calendar( $args = array() ) {
2256      global $wpdb, $m, $monthnum, $year, $wp_locale, $posts;
2257  
2258      $defaults = array(
2259          'initial'   => true,
2260          'display'   => true,
2261          'post_type' => 'post',
2262      );
2263  
2264      $original_args = func_get_args();
2265      $args          = array();
2266  
2267      if ( ! empty( $original_args ) ) {
2268          if ( ! is_array( $original_args[0] ) ) {
2269              if ( isset( $original_args[0] ) && is_bool( $original_args[0] ) ) {
2270                  $defaults['initial'] = $original_args[0];
2271              }
2272              if ( isset( $original_args[1] ) && is_bool( $original_args[1] ) ) {
2273                  $defaults['display'] = $original_args[1];
2274              }
2275          } else {
2276              $args = $original_args[0];
2277          }
2278      }
2279  
2280      /**
2281       * Filter the `get_calendar` function arguments before they are used.
2282       *
2283       * @since 6.8.0
2284       *
2285       * @param array $args {
2286       *     Optional. Arguments for the `get_calendar` function.
2287       *
2288       *     @type bool   $initial   Whether to use initial calendar names. Default true.
2289       *     @type bool   $display   Whether to display the calendar output. Default true.
2290       *     @type string $post_type Optional. Post type. Default 'post'.
2291       * }
2292       */
2293      $args = apply_filters( 'get_calendar_args', wp_parse_args( $args, $defaults ) );
2294  
2295      if ( ! post_type_exists( $args['post_type'] ) ) {
2296          $args['post_type'] = 'post';
2297      }
2298  
2299      $w = 0;
2300      if ( isset( $_GET['w'] ) ) {
2301          $w = (int) $_GET['w'];
2302      }
2303  
2304      /*
2305       * Normalize the cache key.
2306       *
2307       * The following ensures the same cache key is used for the same parameter
2308       * and parameter equivalents. This prevents `post_type > post, initial > true`
2309       * from generating a different key from the same values in the reverse order.
2310       *
2311       * `display` is excluded from the cache key as the cache contains the same
2312       * HTML regardless of this function's need to echo or return the output.
2313       *
2314       * The global values contain data generated by the URL query string variables.
2315       */
2316      $cache_args = $args;
2317      unset( $cache_args['display'] );
2318  
2319      $cache_args['globals'] = array(
2320          'm'        => $m,
2321          'monthnum' => $monthnum,
2322          'year'     => $year,
2323          'week'     => $w,
2324      );
2325  
2326      wp_recursive_ksort( $cache_args );
2327      $key   = md5( serialize( $cache_args ) );
2328      $cache = wp_cache_get( 'get_calendar', 'calendar' );
2329  
2330      if ( $cache && is_array( $cache ) && isset( $cache[ $key ] ) ) {
2331          /** This filter is documented in wp-includes/general-template.php */
2332          $output = apply_filters( 'get_calendar', $cache[ $key ], $args );
2333  
2334          if ( $args['display'] ) {
2335              echo $output;
2336              return;
2337          }
2338  
2339          return $output;
2340      }
2341  
2342      if ( ! is_array( $cache ) ) {
2343          $cache = array();
2344      }
2345  
2346      $post_type = $args['post_type'];
2347  
2348      // Quick check. If we have no posts at all, abort!
2349      if ( ! $posts ) {
2350          $gotsome = $wpdb->get_var(
2351              $wpdb->prepare(
2352                  "SELECT 1 as test
2353                  FROM $wpdb->posts
2354                  WHERE post_type = %s
2355                  AND post_status = 'publish'
2356                  LIMIT 1",
2357                  $post_type
2358              )
2359          );
2360  
2361          if ( ! $gotsome ) {
2362              $cache[ $key ] = '';
2363              wp_cache_set( 'get_calendar', $cache, 'calendar' );
2364              return;
2365          }
2366      }
2367  
2368      // week_begins = 0 stands for Sunday.
2369      $week_begins = (int) get_option( 'start_of_week' );
2370  
2371      // Let's figure out when we are.
2372      if ( ! empty( $monthnum ) && ! empty( $year ) ) {
2373          $thismonth = (int) $monthnum;
2374          $thisyear  = (int) $year;
2375      } elseif ( ! empty( $w ) ) {
2376          // We need to get the month from MySQL.
2377          $thisyear = (int) substr( $m, 0, 4 );
2378          // It seems MySQL's weeks disagree with PHP's.
2379          $d         = ( ( $w - 1 ) * 7 ) + 6;
2380          $thismonth = (int) $wpdb->get_var(
2381              $wpdb->prepare(
2382                  "SELECT DATE_FORMAT((DATE_ADD('%d0101', INTERVAL %d DAY) ), '%%m')",
2383                  $thisyear,
2384                  $d
2385              )
2386          );
2387      } elseif ( ! empty( $m ) ) {
2388          $thisyear = (int) substr( $m, 0, 4 );
2389          if ( strlen( $m ) < 6 ) {
2390              $thismonth = 1;
2391          } else {
2392              $thismonth = (int) substr( $m, 4, 2 );
2393          }
2394      } else {
2395          $thisyear  = (int) current_time( 'Y' );
2396          $thismonth = (int) current_time( 'm' );
2397      }
2398  
2399      $unixmonth = mktime( 0, 0, 0, $thismonth, 1, $thisyear );
2400      $last_day  = gmdate( 't', $unixmonth );
2401  
2402      // Get the next and previous month and year with at least one post.
2403      $previous = $wpdb->get_row(
2404          $wpdb->prepare(
2405              "SELECT MONTH(post_date) AS month, YEAR(post_date) AS year
2406              FROM $wpdb->posts
2407              WHERE post_date < '%d-%d-01'
2408              AND post_type = %s AND post_status = 'publish'
2409              ORDER BY post_date DESC
2410              LIMIT 1",
2411              $thisyear,
2412              zeroise( $thismonth, 2 ),
2413              $post_type
2414          )
2415      );
2416  
2417      $next = $wpdb->get_row(
2418          $wpdb->prepare(
2419              "SELECT MONTH(post_date) AS month, YEAR(post_date) AS year
2420              FROM $wpdb->posts
2421              WHERE post_date > '%d-%d-%d 23:59:59'
2422              AND post_type = %s AND post_status = 'publish'
2423              ORDER BY post_date ASC
2424              LIMIT 1",
2425              $thisyear,
2426              zeroise( $thismonth, 2 ),
2427              $last_day,
2428              $post_type
2429          )
2430      );
2431  
2432      /* translators: Calendar caption: 1: Month name, 2: 4-digit year. */
2433      $calendar_caption = _x( '%1$s %2$s', 'calendar caption' );
2434      $calendar_output  = '<table id="wp-calendar" class="wp-calendar-table">
2435      <caption>' . sprintf(
2436          $calendar_caption,
2437          $wp_locale->get_month( $thismonth ),
2438          gmdate( 'Y', $unixmonth )
2439      ) . '</caption>
2440      <thead>
2441      <tr>';
2442  
2443      $myweek = array();
2444  
2445      for ( $wdcount = 0; $wdcount <= 6; $wdcount++ ) {
2446          $myweek[] = $wp_locale->get_weekday( ( $wdcount + $week_begins ) % 7 );
2447      }
2448  
2449      foreach ( $myweek as $wd ) {
2450          $day_name         = $args['initial'] ? $wp_locale->get_weekday_initial( $wd ) : $wp_locale->get_weekday_abbrev( $wd );
2451          $wd               = esc_attr( $wd );
2452          $calendar_output .= "\n\t\t<th scope=\"col\" aria-label=\"$wd\">$day_name</th>";
2453      }
2454  
2455      $calendar_output .= '
2456      </tr>
2457      </thead>
2458      <tbody>
2459      <tr>';
2460  
2461      $daywithpost = array();
2462  
2463      // Get days with posts.
2464      $dayswithposts = $wpdb->get_results(
2465          $wpdb->prepare(
2466              "SELECT DISTINCT DAYOFMONTH(post_date)
2467              FROM $wpdb->posts WHERE post_date >= '%d-%d-01 00:00:00'
2468              AND post_type = %s AND post_status = 'publish'
2469              AND post_date <= '%d-%d-%d 23:59:59'",
2470              $thisyear,
2471              zeroise( $thismonth, 2 ),
2472              $post_type,
2473              $thisyear,
2474              zeroise( $thismonth, 2 ),
2475              $last_day
2476          ),
2477          ARRAY_N
2478      );
2479  
2480      if ( $dayswithposts ) {
2481          foreach ( (array) $dayswithposts as $daywith ) {
2482              $daywithpost[] = (int) $daywith[0];
2483          }
2484      }
2485  
2486      // See how much we should pad in the beginning.
2487      $pad = calendar_week_mod( (int) gmdate( 'w', $unixmonth ) - $week_begins );
2488      if ( $pad > 0 ) {
2489          $calendar_output .= "\n\t\t" . '<td colspan="' . esc_attr( $pad ) . '" class="pad">&nbsp;</td>';
2490      }
2491  
2492      $newrow      = false;
2493      $daysinmonth = (int) gmdate( 't', $unixmonth );
2494  
2495      for ( $day = 1; $day <= $daysinmonth; ++$day ) {
2496          if ( isset( $newrow ) && $newrow ) {
2497              $calendar_output .= "\n\t</tr>\n\t<tr>\n\t\t";
2498          }
2499  
2500          $newrow = false;
2501  
2502          if ( (int) current_time( 'j' ) === $day
2503              && (int) current_time( 'm' ) === $thismonth
2504              && (int) current_time( 'Y' ) === $thisyear
2505          ) {
2506              $calendar_output .= '<td id="today">';
2507          } else {
2508              $calendar_output .= '<td>';
2509          }
2510  
2511          if ( in_array( $day, $daywithpost, true ) ) {
2512              // Any posts today?
2513              $date_format = gmdate( _x( 'F j, Y', 'daily archives date format' ), strtotime( "{$thisyear}-{$thismonth}-{$day}" ) );
2514              /* translators: Post calendar label. %s: Date. */
2515              $label            = sprintf( __( 'Posts published on %s' ), $date_format );
2516              $calendar_output .= sprintf(
2517                  '<a href="%s" aria-label="%s">%s</a>',
2518                  get_day_link( $thisyear, $thismonth, $day ),
2519                  esc_attr( $label ),
2520                  $day
2521              );
2522          } else {
2523              $calendar_output .= $day;
2524          }
2525  
2526          $calendar_output .= '</td>';
2527  
2528          if ( 6 === (int) calendar_week_mod( (int) gmdate( 'w', mktime( 0, 0, 0, $thismonth, $day, $thisyear ) ) - $week_begins ) ) {
2529              $newrow = true;
2530          }
2531      }
2532  
2533      $pad = 7 - calendar_week_mod( (int) gmdate( 'w', mktime( 0, 0, 0, $thismonth, $day, $thisyear ) ) - $week_begins );
2534      if ( 0 < $pad && $pad < 7 ) {
2535          $calendar_output .= "\n\t\t" . '<td class="pad" colspan="' . esc_attr( $pad ) . '">&nbsp;</td>';
2536      }
2537  
2538      $calendar_output .= "\n\t</tr>\n\t</tbody>";
2539  
2540      $calendar_output .= "\n\t</table>";
2541  
2542      $calendar_output .= '<nav aria-label="' . __( 'Previous and next months' ) . '" class="wp-calendar-nav">';
2543  
2544      if ( $previous ) {
2545          $calendar_output .= "\n\t\t" . sprintf(
2546              '<span class="wp-calendar-nav-prev"><a href="%1$s">&laquo; %2$s</a></span>',
2547              get_month_link( $previous->year, $previous->month ),
2548              $wp_locale->get_month_abbrev( $wp_locale->get_month( $previous->month ) )
2549          );
2550      } else {
2551          $calendar_output .= "\n\t\t" . '<span class="wp-calendar-nav-prev">&nbsp;</span>';
2552      }
2553  
2554      $calendar_output .= "\n\t\t" . '<span class="pad">&nbsp;</span>';
2555  
2556      if ( $next ) {
2557          $calendar_output .= "\n\t\t" . sprintf(
2558              '<span class="wp-calendar-nav-next"><a href="%1$s">%2$s &raquo;</a></span>',
2559              get_month_link( $next->year, $next->month ),
2560              $wp_locale->get_month_abbrev( $wp_locale->get_month( $next->month ) )
2561          );
2562      } else {
2563          $calendar_output .= "\n\t\t" . '<span class="wp-calendar-nav-next">&nbsp;</span>';
2564      }
2565  
2566      $calendar_output .= '
2567      </nav>';
2568  
2569      $cache[ $key ] = $calendar_output;
2570      wp_cache_set( 'get_calendar', $cache, 'calendar' );
2571  
2572      /**
2573       * Filters the HTML calendar output.
2574       *
2575       * @since 3.0.0
2576       * @since 6.8.0 Added the `$args` parameter.
2577       *
2578       * @param string $calendar_output HTML output of the calendar.
2579       * @param array  $args {
2580       *     Optional. Array of display arguments.
2581       *
2582       *     @type bool   $initial   Whether to use initial calendar names. Default true.
2583       *     @type bool   $display   Whether to display the calendar output. Default true.
2584       *     @type string $post_type Optional. Post type. Default 'post'.
2585       * }
2586       */
2587      $calendar_output = apply_filters( 'get_calendar', $calendar_output, $args );
2588  
2589      if ( $args['display'] ) {
2590          echo $calendar_output;
2591          return;
2592      }
2593  
2594      return $calendar_output;
2595  }
2596  
2597  /**
2598   * Purges the cached results of get_calendar.
2599   *
2600   * @see get_calendar()
2601   * @since 2.1.0
2602   */
2603  function delete_get_calendar_cache() {
2604      wp_cache_delete( 'get_calendar', 'calendar' );
2605  }
2606  
2607  /**
2608   * Displays all of the allowed tags in HTML format with attributes.
2609   *
2610   * This is useful for displaying in the comment area, which elements and
2611   * attributes are supported. As well as any plugins which want to display it.
2612   *
2613   * @since 1.0.1
2614   * @since 4.4.0 No longer used in core.
2615   *
2616   * @global array $allowedtags
2617   *
2618   * @return string HTML allowed tags entity encoded.
2619   */
2620  function allowed_tags() {
2621      global $allowedtags;
2622      $allowed = '';
2623      foreach ( (array) $allowedtags as $tag => $attributes ) {
2624          $allowed .= '<' . $tag;
2625          if ( 0 < count( $attributes ) ) {
2626              foreach ( $attributes as $attribute => $limits ) {
2627                  $allowed .= ' ' . $attribute . '=""';
2628              }
2629          }
2630          $allowed .= '> ';
2631      }
2632      return htmlentities( $allowed );
2633  }
2634  
2635  /***** Date/Time tags */
2636  
2637  /**
2638   * Outputs the date in iso8601 format for xml files.
2639   *
2640   * @since 1.0.0
2641   */
2642  function the_date_xml() {
2643      echo mysql2date( 'Y-m-d', get_post()->post_date, false );
2644  }
2645  
2646  /**
2647   * Displays or retrieves the date of the post (once per date).
2648   *
2649   * Will only output the date if the current post's date is different from the
2650   * previous one output.
2651   *
2652   * i.e. Only one date listing will show per day worth of posts shown in the loop, even if the
2653   * function is called several times for each post.
2654   *
2655   * HTML output can be filtered with {@see 'the_date'}.
2656   * Date string output can be filtered with {@see 'get_the_date'}.
2657   *
2658   * @since 0.71
2659   *
2660   * @global string $currentday  The day of the current post in the loop.
2661   * @global string $previousday The day of the previous post in the loop.
2662   *
2663   * @param string $format  Optional. PHP date format. Defaults to the 'date_format' option.
2664   * @param string $before  Optional. Output before the date. Default empty.
2665   * @param string $after   Optional. Output after the date. Default empty.
2666   * @param bool   $display Optional. Whether to echo the date or return it. Default true.
2667   * @return string|void String if retrieving.
2668   */
2669  function the_date( $format = '', $before = '', $after = '', $display = true ) {
2670      global $currentday, $previousday;
2671  
2672      $the_date = '';
2673  
2674      if ( is_new_day() ) {
2675          $the_date    = $before . get_the_date( $format ) . $after;
2676          $previousday = $currentday;
2677      }
2678  
2679      /**
2680       * Filters the date of the post, for display.
2681       *
2682       * @since 0.71
2683       *
2684       * @param string $the_date The formatted date string.
2685       * @param string $format   PHP date format.
2686       * @param string $before   HTML output before the date.
2687       * @param string $after    HTML output after the date.
2688       */
2689      $the_date = apply_filters( 'the_date', $the_date, $format, $before, $after );
2690  
2691      if ( $display ) {
2692          echo $the_date;
2693      } else {
2694          return $the_date;
2695      }
2696  }
2697  
2698  /**
2699   * Retrieves the date of the post.
2700   *
2701   * Unlike the_date() this function will always return the date.
2702   * Modify output with the {@see 'get_the_date'} filter.
2703   *
2704   * @since 3.0.0
2705   *
2706   * @param string      $format Optional. PHP date format. Defaults to the 'date_format' option.
2707   * @param int|WP_Post $post   Optional. Post ID or WP_Post object. Default current post.
2708   * @return string|int|false Date the current post was written. False on failure.
2709   */
2710  function get_the_date( $format = '', $post = null ) {
2711      $post = get_post( $post );
2712  
2713      if ( ! $post ) {
2714          return false;
2715      }
2716  
2717      $_format = ! empty( $format ) ? $format : get_option( 'date_format' );
2718  
2719      $the_date = get_post_time( $_format, false, $post, true );
2720  
2721      /**
2722       * Filters the date of the post.
2723       *
2724       * @since 3.0.0
2725       *
2726       * @param string|int $the_date Formatted date string or Unix timestamp if `$format` is 'U' or 'G'.
2727       * @param string     $format   PHP date format.
2728       * @param WP_Post    $post     The post object.
2729       */
2730      return apply_filters( 'get_the_date', $the_date, $format, $post );
2731  }
2732  
2733  /**
2734   * Displays the date on which the post was last modified.
2735   *
2736   * @since 2.1.0
2737   *
2738   * @param string $format  Optional. PHP date format. Defaults to the 'date_format' option.
2739   * @param string $before  Optional. Output before the date. Default empty.
2740   * @param string $after   Optional. Output after the date. Default empty.
2741   * @param bool   $display Optional. Whether to echo the date or return it. Default true.
2742   * @return string|void String if retrieving.
2743   */
2744  function the_modified_date( $format = '', $before = '', $after = '', $display = true ) {
2745      $the_modified_date = $before . get_the_modified_date( $format ) . $after;
2746  
2747      /**
2748       * Filters the date a post was last modified, for display.
2749       *
2750       * @since 2.1.0
2751       *
2752       * @param string $the_modified_date The last modified date.
2753       * @param string $format            PHP date format.
2754       * @param string $before            HTML output before the date.
2755       * @param string $after             HTML output after the date.
2756       */
2757      $the_modified_date = apply_filters( 'the_modified_date', $the_modified_date, $format, $before, $after );
2758  
2759      if ( $display ) {
2760          echo $the_modified_date;
2761      } else {
2762          return $the_modified_date;
2763      }
2764  }
2765  
2766  /**
2767   * Retrieves the date on which the post was last modified.
2768   *
2769   * @since 2.1.0
2770   * @since 4.6.0 Added the `$post` parameter.
2771   *
2772   * @param string      $format Optional. PHP date format. Defaults to the 'date_format' option.
2773   * @param int|WP_Post $post   Optional. Post ID or WP_Post object. Default current post.
2774   * @return string|int|false Date the current post was modified. False on failure.
2775   */
2776  function get_the_modified_date( $format = '', $post = null ) {
2777      $post = get_post( $post );
2778  
2779      if ( ! $post ) {
2780          // For backward compatibility, failures go through the filter below.
2781          $the_time = false;
2782      } else {
2783          $_format = ! empty( $format ) ? $format : get_option( 'date_format' );
2784  
2785          $the_time = get_post_modified_time( $_format, false, $post, true );
2786      }
2787  
2788      /**
2789       * Filters the date a post was last modified.
2790       *
2791       * @since 2.1.0
2792       * @since 4.6.0 Added the `$post` parameter.
2793       *
2794       * @param string|int|false $the_time The formatted date or false if no post is found.
2795       * @param string           $format   PHP date format.
2796       * @param WP_Post|null     $post     WP_Post object or null if no post is found.
2797       */
2798      return apply_filters( 'get_the_modified_date', $the_time, $format, $post );
2799  }
2800  
2801  /**
2802   * Displays the time of the post.
2803   *
2804   * @since 0.71
2805   *
2806   * @param string $format Optional. Format to use for retrieving the time the post
2807   *                       was written. Accepts 'G', 'U', or PHP date format.
2808   *                       Defaults to the 'time_format' option.
2809   */
2810  function the_time( $format = '' ) {
2811      /**
2812       * Filters the time of the post, for display.
2813       *
2814       * @since 0.71
2815       *
2816       * @param string $get_the_time The formatted time.
2817       * @param string $format       Format to use for retrieving the time the post
2818       *                             was written. Accepts 'G', 'U', or PHP date format.
2819       */
2820      echo apply_filters( 'the_time', get_the_time( $format ), $format );
2821  }
2822  
2823  /**
2824   * Retrieves the time of the post.
2825   *
2826   * @since 1.5.0
2827   *
2828   * @param string      $format Optional. Format to use for retrieving the time the post
2829   *                            was written. Accepts 'G', 'U', or PHP date format.
2830   *                            Defaults to the 'time_format' option.
2831   * @param int|WP_Post $post   Post ID or post object. Default is global `$post` object.
2832   * @return string|int|false Formatted date string or Unix timestamp if `$format` is 'U' or 'G'.
2833   *                          False on failure.
2834   */
2835  function get_the_time( $format = '', $post = null ) {
2836      $post = get_post( $post );
2837  
2838      if ( ! $post ) {
2839          return false;
2840      }
2841  
2842      $_format = ! empty( $format ) ? $format : get_option( 'time_format' );
2843  
2844      $the_time = get_post_time( $_format, false, $post, true );
2845  
2846      /**
2847       * Filters the time of the post.
2848       *
2849       * @since 1.5.0
2850       *
2851       * @param string|int $the_time Formatted date string or Unix timestamp if `$format` is 'U' or 'G'.
2852       * @param string     $format   Format to use for retrieving the time the post
2853       *                             was written. Accepts 'G', 'U', or PHP date format.
2854       * @param WP_Post    $post     Post object.
2855       */
2856      return apply_filters( 'get_the_time', $the_time, $format, $post );
2857  }
2858  
2859  /**
2860   * Retrieves the localized time of the post.
2861   *
2862   * @since 2.0.0
2863   *
2864   * @param string      $format    Optional. Format to use for retrieving the time the post
2865   *                               was written. Accepts 'G', 'U', or PHP date format. Default 'U'.
2866   * @param bool        $gmt       Optional. Whether to retrieve the GMT time. Default false.
2867   * @param int|WP_Post $post      Post ID or post object. Default is global `$post` object.
2868   * @param bool        $translate Whether to translate the time string. Default false.
2869   * @return string|int|false Formatted date string or Unix timestamp if `$format` is 'U' or 'G'.
2870   *                          False on failure.
2871   */
2872  function get_post_time( $format = 'U', $gmt = false, $post = null, $translate = false ) {
2873      $post = get_post( $post );
2874  
2875      if ( ! $post ) {
2876          return false;
2877      }
2878  
2879      $source   = ( $gmt ) ? 'gmt' : 'local';
2880      $datetime = get_post_datetime( $post, 'date', $source );
2881  
2882      if ( false === $datetime ) {
2883          return false;
2884      }
2885  
2886      if ( 'U' === $format || 'G' === $format ) {
2887          $time = $datetime->getTimestamp();
2888  
2889          // Returns a sum of timestamp with timezone offset. Ideally should never be used.
2890          if ( ! $gmt ) {
2891              $time += $datetime->getOffset();
2892          }
2893      } elseif ( $translate ) {
2894          $time = wp_date( $format, $datetime->getTimestamp(), $gmt ? new DateTimeZone( 'UTC' ) : null );
2895      } else {
2896          if ( $gmt ) {
2897              $datetime = $datetime->setTimezone( new DateTimeZone( 'UTC' ) );
2898          }
2899  
2900          $time = $datetime->format( $format );
2901      }
2902  
2903      /**
2904       * Filters the localized time of the post.
2905       *
2906       * @since 2.6.0
2907       *
2908       * @param string|int $time   Formatted date string or Unix timestamp if `$format` is 'U' or 'G'.
2909       * @param string     $format Format to use for retrieving the date of the post.
2910       *                           Accepts 'G', 'U', or PHP date format.
2911       * @param bool       $gmt    Whether to retrieve the GMT time.
2912       */
2913      return apply_filters( 'get_post_time', $time, $format, $gmt );
2914  }
2915  
2916  /**
2917   * Retrieves post published or modified time as a `DateTimeImmutable` object instance.
2918   *
2919   * The object will be set to the timezone from WordPress settings.
2920   *
2921   * For legacy reasons, this function allows to choose to instantiate from local or UTC time in database.
2922   * Normally this should make no difference to the result. However, the values might get out of sync in database,
2923   * typically because of timezone setting changes. The parameter ensures the ability to reproduce backwards
2924   * compatible behaviors in such cases.
2925   *
2926   * @since 5.3.0
2927   *
2928   * @param int|WP_Post $post   Optional. Post ID or post object. Default is global `$post` object.
2929   * @param string      $field  Optional. Published or modified time to use from database. Accepts 'date' or 'modified'.
2930   *                            Default 'date'.
2931   * @param string      $source Optional. Local or UTC time to use from database. Accepts 'local' or 'gmt'.
2932   *                            Default 'local'.
2933   * @return DateTimeImmutable|false Time object on success, false on failure.
2934   */
2935  function get_post_datetime( $post = null, $field = 'date', $source = 'local' ) {
2936      $post = get_post( $post );
2937  
2938      if ( ! $post ) {
2939          return false;
2940      }
2941  
2942      $wp_timezone = wp_timezone();
2943  
2944      if ( 'gmt' === $source ) {
2945          $time     = ( 'modified' === $field ) ? $post->post_modified_gmt : $post->post_date_gmt;
2946          $timezone = new DateTimeZone( 'UTC' );
2947      } else {
2948          $time     = ( 'modified' === $field ) ? $post->post_modified : $post->post_date;
2949          $timezone = $wp_timezone;
2950      }
2951  
2952      if ( empty( $time ) || '0000-00-00 00:00:00' === $time ) {
2953          return false;
2954      }
2955  
2956      $datetime = date_create_immutable_from_format( 'Y-m-d H:i:s', $time, $timezone );
2957  
2958      if ( false === $datetime ) {
2959          return false;
2960      }
2961  
2962      return $datetime->setTimezone( $wp_timezone );
2963  }
2964  
2965  /**
2966   * Retrieves post published or modified time as a Unix timestamp.
2967   *
2968   * Note that this function returns a true Unix timestamp, not summed with timezone offset
2969   * like older WP functions.
2970   *
2971   * @since 5.3.0
2972   *
2973   * @param int|WP_Post $post  Optional. Post ID or post object. Default is global `$post` object.
2974   * @param string      $field Optional. Published or modified time to use from database. Accepts 'date' or 'modified'.
2975   *                           Default 'date'.
2976   * @return int|false Unix timestamp on success, false on failure.
2977   */
2978  function get_post_timestamp( $post = null, $field = 'date' ) {
2979      $datetime = get_post_datetime( $post, $field );
2980  
2981      if ( false === $datetime ) {
2982          return false;
2983      }
2984  
2985      return $datetime->getTimestamp();
2986  }
2987  
2988  /**
2989   * Displays the time at which the post was last modified.
2990   *
2991   * @since 2.0.0
2992   *
2993   * @param string $format Optional. Format to use for retrieving the time the post
2994   *                       was modified. Accepts 'G', 'U', or PHP date format.
2995   *                       Defaults to the 'time_format' option.
2996   */
2997  function the_modified_time( $format = '' ) {
2998      /**
2999       * Filters the localized time a post was last modified, for display.
3000       *
3001       * @since 2.0.0
3002       *
3003       * @param string|false $get_the_modified_time The formatted time or false if no post is found.
3004       * @param string       $format                Format to use for retrieving the time the post
3005       *                                            was modified. Accepts 'G', 'U', or PHP date format.
3006       */
3007      echo apply_filters( 'the_modified_time', get_the_modified_time( $format ), $format );
3008  }
3009  
3010  /**
3011   * Retrieves the time at which the post was last modified.
3012   *
3013   * @since 2.0.0
3014   * @since 4.6.0 Added the `$post` parameter.
3015   *
3016   * @param string      $format Optional. Format to use for retrieving the time the post
3017   *                            was modified. Accepts 'G', 'U', or PHP date format.
3018   *                            Defaults to the 'time_format' option.
3019   * @param int|WP_Post $post   Optional. Post ID or WP_Post object. Default current post.
3020   * @return string|int|false Formatted date string or Unix timestamp. False on failure.
3021   */
3022  function get_the_modified_time( $format = '', $post = null ) {
3023      $post = get_post( $post );
3024  
3025      if ( ! $post ) {
3026          // For backward compatibility, failures go through the filter below.
3027          $the_time = false;
3028      } else {
3029          $_format = ! empty( $format ) ? $format : get_option( 'time_format' );
3030  
3031          $the_time = get_post_modified_time( $_format, false, $post, true );
3032      }
3033  
3034      /**
3035       * Filters the localized time a post was last modified.
3036       *
3037       * @since 2.0.0
3038       * @since 4.6.0 Added the `$post` parameter.
3039       *
3040       * @param string|int|false $the_time The formatted time or false if no post is found.
3041       * @param string           $format   Format to use for retrieving the time the post
3042       *                                   was modified. Accepts 'G', 'U', or PHP date format.
3043       * @param WP_Post|null     $post     WP_Post object or null if no post is found.
3044       */
3045      return apply_filters( 'get_the_modified_time', $the_time, $format, $post );
3046  }
3047  
3048  /**
3049   * Retrieves the time at which the post was last modified.
3050   *
3051   * @since 2.0.0
3052   *
3053   * @param string      $format    Optional. Format to use for retrieving the time the post
3054   *                               was modified. Accepts 'G', 'U', or PHP date format. Default 'U'.
3055   * @param bool        $gmt       Optional. Whether to retrieve the GMT time. Default false.
3056   * @param int|WP_Post $post      Post ID or post object. Default is global `$post` object.
3057   * @param bool        $translate Whether to translate the time string. Default false.
3058   * @return string|int|false Formatted date string or Unix timestamp if `$format` is 'U' or 'G'.
3059   *                          False on failure.
3060   */
3061  function get_post_modified_time( $format = 'U', $gmt = false, $post = null, $translate = false ) {
3062      $post = get_post( $post );
3063  
3064      if ( ! $post ) {
3065          return false;
3066      }
3067  
3068      $source   = ( $gmt ) ? 'gmt' : 'local';
3069      $datetime = get_post_datetime( $post, 'modified', $source );
3070  
3071      if ( false === $datetime ) {
3072          return false;
3073      }
3074  
3075      if ( 'U' === $format || 'G' === $format ) {
3076          $time = $datetime->getTimestamp();
3077  
3078          // Returns a sum of timestamp with timezone offset. Ideally should never be used.
3079          if ( ! $gmt ) {
3080              $time += $datetime->getOffset();
3081          }
3082      } elseif ( $translate ) {
3083          $time = wp_date( $format, $datetime->getTimestamp(), $gmt ? new DateTimeZone( 'UTC' ) : null );
3084      } else {
3085          if ( $gmt ) {
3086              $datetime = $datetime->setTimezone( new DateTimeZone( 'UTC' ) );
3087          }
3088  
3089          $time = $datetime->format( $format );
3090      }
3091  
3092      /**
3093       * Filters the localized time a post was last modified.
3094       *
3095       * @since 2.8.0
3096       *
3097       * @param string|int $time   Formatted date string or Unix timestamp if `$format` is 'U' or 'G'.
3098       * @param string     $format Format to use for retrieving the time the post was modified.
3099       *                           Accepts 'G', 'U', or PHP date format. Default 'U'.
3100       * @param bool       $gmt    Whether to retrieve the GMT time. Default false.
3101       */
3102      return apply_filters( 'get_post_modified_time', $time, $format, $gmt );
3103  }
3104  
3105  /**
3106   * Displays the localized weekday for the post.
3107   *
3108   * @since 0.71
3109   *
3110   * @global WP_Locale $wp_locale WordPress date and time locale object.
3111   */
3112  function the_weekday() {
3113      global $wp_locale;
3114  
3115      $post = get_post();
3116  
3117      if ( ! $post ) {
3118          return;
3119      }
3120  
3121      $the_weekday = $wp_locale->get_weekday( get_post_time( 'w', false, $post ) );
3122  
3123      /**
3124       * Filters the localized weekday of the post, for display.
3125       *
3126       * @since 0.71
3127       *
3128       * @param string $the_weekday
3129       */
3130      echo apply_filters( 'the_weekday', $the_weekday );
3131  }
3132  
3133  /**
3134   * Displays the localized weekday for the post.
3135   *
3136   * Will only output the weekday if the current post's weekday is different from
3137   * the previous one output.
3138   *
3139   * @since 0.71
3140   *
3141   * @global WP_Locale $wp_locale       WordPress date and time locale object.
3142   * @global string    $currentday      The day of the current post in the loop.
3143   * @global string    $previousweekday The day of the previous post in the loop.
3144   *
3145   * @param string $before Optional. Output before the date. Default empty.
3146   * @param string $after  Optional. Output after the date. Default empty.
3147   */
3148  function the_weekday_date( $before = '', $after = '' ) {
3149      global $wp_locale, $currentday, $previousweekday;
3150  
3151      $post = get_post();
3152  
3153      if ( ! $post ) {
3154          return;
3155      }
3156  
3157      $the_weekday_date = '';
3158  
3159      if ( $currentday !== $previousweekday ) {
3160          $the_weekday_date .= $before;
3161          $the_weekday_date .= $wp_locale->get_weekday( get_post_time( 'w', false, $post ) );
3162          $the_weekday_date .= $after;
3163          $previousweekday   = $currentday;
3164      }
3165  
3166      /**
3167       * Filters the localized weekday of the post, for display.
3168       *
3169       * @since 0.71
3170       *
3171       * @param string $the_weekday_date The weekday on which the post was written.
3172       * @param string $before           The HTML to output before the date.
3173       * @param string $after            The HTML to output after the date.
3174       */
3175      echo apply_filters( 'the_weekday_date', $the_weekday_date, $before, $after );
3176  }
3177  
3178  /**
3179   * Fires the wp_head action.
3180   *
3181   * See {@see 'wp_head'}.
3182   *
3183   * @since 1.2.0
3184   */
3185  function wp_head() {
3186      /**
3187       * Prints scripts or data in the head tag on the front end.
3188       *
3189       * @since 1.5.0
3190       */
3191      do_action( 'wp_head' );
3192  }
3193  
3194  /**
3195   * Fires the wp_footer action.
3196   *
3197   * See {@see 'wp_footer'}.
3198   *
3199   * @since 1.5.1
3200   */
3201  function wp_footer() {
3202      /**
3203       * Prints scripts or data before the closing body tag on the front end.
3204       *
3205       * @since 1.5.1
3206       */
3207      do_action( 'wp_footer' );
3208  }
3209  
3210  /**
3211   * Fires the wp_body_open action.
3212   *
3213   * See {@see 'wp_body_open'}.
3214   *
3215   * @since 5.2.0
3216   */
3217  function wp_body_open() {
3218      /**
3219       * Triggered after the opening body tag.
3220       *
3221       * @since 5.2.0
3222       */
3223      do_action( 'wp_body_open' );
3224  }
3225  
3226  /**
3227   * Displays the links to the general feeds.
3228   *
3229   * @since 2.8.0
3230   *
3231   * @param array $args Optional arguments.
3232   */
3233  function feed_links( $args = array() ) {
3234      if ( ! current_theme_supports( 'automatic-feed-links' ) ) {
3235          return;
3236      }
3237  
3238      $defaults = array(
3239          /* translators: Separator between site name and feed type in feed links. */
3240          'separator' => _x( '&raquo;', 'feed link' ),
3241          /* translators: 1: Site title, 2: Separator (raquo). */
3242          'feedtitle' => __( '%1$s %2$s Feed' ),
3243          /* translators: 1: Site title, 2: Separator (raquo). */
3244          'comstitle' => __( '%1$s %2$s Comments Feed' ),
3245      );
3246  
3247      $args = wp_parse_args( $args, $defaults );
3248  
3249      /**
3250       * Filters the feed links arguments.
3251       *
3252       * @since 6.7.0
3253       *
3254       * @param array $args An array of feed links arguments.
3255       */
3256      $args = apply_filters( 'feed_links_args', $args );
3257  
3258      /**
3259       * Filters whether to display the posts feed link.
3260       *
3261       * @since 4.4.0
3262       *
3263       * @param bool $show Whether to display the posts feed link. Default true.
3264       */
3265      if ( apply_filters( 'feed_links_show_posts_feed', true ) ) {
3266          printf(
3267              '<link rel="alternate" type="%s" title="%s" href="%s" />' . "\n",
3268              feed_content_type(),
3269              esc_attr( sprintf( $args['feedtitle'], get_bloginfo( 'name' ), $args['separator'] ) ),
3270              esc_url( get_feed_link() )
3271          );
3272      }
3273  
3274      /**
3275       * Filters whether to display the comments feed link.
3276       *
3277       * @since 4.4.0
3278       *
3279       * @param bool $show Whether to display the comments feed link. Default true.
3280       */
3281      if ( apply_filters( 'feed_links_show_comments_feed', true ) ) {
3282          printf(
3283              '<link rel="alternate" type="%s" title="%s" href="%s" />' . "\n",
3284              feed_content_type(),
3285              esc_attr( sprintf( $args['comstitle'], get_bloginfo( 'name' ), $args['separator'] ) ),
3286              esc_url( get_feed_link( 'comments_' . get_default_feed() ) )
3287          );
3288      }
3289  }
3290  
3291  /**
3292   * Displays the links to the extra feeds such as category feeds.
3293   *
3294   * @since 2.8.0
3295   *
3296   * @param array $args Optional arguments.
3297   */
3298  function feed_links_extra( $args = array() ) {
3299      $defaults = array(
3300          /* translators: Separator between site name and feed type in feed links. */
3301          'separator'     => _x( '&raquo;', 'feed link' ),
3302          /* translators: 1: Site name, 2: Separator (raquo), 3: Post title. */
3303          'singletitle'   => __( '%1$s %2$s %3$s Comments Feed' ),
3304          /* translators: 1: Site name, 2: Separator (raquo), 3: Category name. */
3305          'cattitle'      => __( '%1$s %2$s %3$s Category Feed' ),
3306          /* translators: 1: Site name, 2: Separator (raquo), 3: Tag name. */
3307          'tagtitle'      => __( '%1$s %2$s %3$s Tag Feed' ),
3308          /* translators: 1: Site name, 2: Separator (raquo), 3: Term name, 4: Taxonomy singular name. */
3309          'taxtitle'      => __( '%1$s %2$s %3$s %4$s Feed' ),
3310          /* translators: 1: Site name, 2: Separator (raquo), 3: Author name. */
3311          'authortitle'   => __( '%1$s %2$s Posts by %3$s Feed' ),
3312          /* translators: 1: Site name, 2: Separator (raquo), 3: Search query. */
3313          'searchtitle'   => __( '%1$s %2$s Search Results for &#8220;%3$s&#8221; Feed' ),
3314          /* translators: 1: Site name, 2: Separator (raquo), 3: Post type name. */
3315          'posttypetitle' => __( '%1$s %2$s %3$s Feed' ),
3316      );
3317  
3318      $args = wp_parse_args( $args, $defaults );
3319  
3320      /**
3321       * Filters the extra feed links arguments.
3322       *
3323       * @since 6.7.0
3324       *
3325       * @param array $args An array of extra feed links arguments.
3326       */
3327      $args = apply_filters( 'feed_links_extra_args', $args );
3328  
3329      if ( is_singular() ) {
3330          $id   = 0;
3331          $post = get_post( $id );
3332  
3333          /** This filter is documented in wp-includes/general-template.php */
3334          $show_comments_feed = apply_filters( 'feed_links_show_comments_feed', true );
3335  
3336          /**
3337           * Filters whether to display the post comments feed link.
3338           *
3339           * This filter allows to enable or disable the feed link for a singular post
3340           * in a way that is independent of {@see 'feed_links_show_comments_feed'}
3341           * (which controls the global comments feed). The result of that filter
3342           * is accepted as a parameter.
3343           *
3344           * @since 6.1.0
3345           *
3346           * @param bool $show_comments_feed Whether to display the post comments feed link. Defaults to
3347           *                                 the {@see 'feed_links_show_comments_feed'} filter result.
3348           */
3349          $show_post_comments_feed = apply_filters( 'feed_links_extra_show_post_comments_feed', $show_comments_feed );
3350  
3351          if ( $show_post_comments_feed && ( comments_open() || pings_open() || $post->comment_count > 0 ) ) {
3352              $title = sprintf(
3353                  $args['singletitle'],
3354                  get_bloginfo( 'name' ),
3355                  $args['separator'],
3356                  the_title_attribute( array( 'echo' => false ) )
3357              );
3358  
3359              $feed_link = get_post_comments_feed_link( $post->ID );
3360  
3361              if ( $feed_link ) {
3362                  $href = $feed_link;
3363              }
3364          }
3365      } elseif ( is_post_type_archive() ) {
3366          /**
3367           * Filters whether to display the post type archive feed link.
3368           *
3369           * @since 6.1.0
3370           *
3371           * @param bool $show Whether to display the post type archive feed link. Default true.
3372           */
3373          $show_post_type_archive_feed = apply_filters( 'feed_links_extra_show_post_type_archive_feed', true );
3374  
3375          if ( $show_post_type_archive_feed ) {
3376              $post_type = get_query_var( 'post_type' );
3377  
3378              if ( is_array( $post_type ) ) {
3379                  $post_type = reset( $post_type );
3380              }
3381  
3382              $post_type_obj = get_post_type_object( $post_type );
3383  
3384              $title = sprintf(
3385                  $args['posttypetitle'],
3386                  get_bloginfo( 'name' ),
3387                  $args['separator'],
3388                  $post_type_obj->labels->name
3389              );
3390  
3391              $href = get_post_type_archive_feed_link( $post_type_obj->name );
3392          }
3393      } elseif ( is_category() ) {
3394          /**
3395           * Filters whether to display the category feed link.
3396           *
3397           * @since 6.1.0
3398           *
3399           * @param bool $show Whether to display the category feed link. Default true.
3400           */
3401          $show_category_feed = apply_filters( 'feed_links_extra_show_category_feed', true );
3402  
3403          if ( $show_category_feed ) {
3404              $term = get_queried_object();
3405  
3406              if ( $term ) {
3407                  $title = sprintf(
3408                      $args['cattitle'],
3409                      get_bloginfo( 'name' ),
3410                      $args['separator'],
3411                      $term->name
3412                  );
3413  
3414                  $href = get_category_feed_link( $term->term_id );
3415              }
3416          }
3417      } elseif ( is_tag() ) {
3418          /**
3419           * Filters whether to display the tag feed link.
3420           *
3421           * @since 6.1.0
3422           *
3423           * @param bool $show Whether to display the tag feed link. Default true.
3424           */
3425          $show_tag_feed = apply_filters( 'feed_links_extra_show_tag_feed', true );
3426  
3427          if ( $show_tag_feed ) {
3428              $term = get_queried_object();
3429  
3430              if ( $term ) {
3431                  $title = sprintf(
3432                      $args['tagtitle'],
3433                      get_bloginfo( 'name' ),
3434                      $args['separator'],
3435                      $term->name
3436                  );
3437  
3438                  $href = get_tag_feed_link( $term->term_id );
3439              }
3440          }
3441      } elseif ( is_tax() ) {
3442          /**
3443           * Filters whether to display the custom taxonomy feed link.
3444           *
3445           * @since 6.1.0
3446           *
3447           * @param bool $show Whether to display the custom taxonomy feed link. Default true.
3448           */
3449          $show_tax_feed = apply_filters( 'feed_links_extra_show_tax_feed', true );
3450  
3451          if ( $show_tax_feed ) {
3452              $term = get_queried_object();
3453  
3454              if ( $term ) {
3455                  $tax = get_taxonomy( $term->taxonomy );
3456  
3457                  $title = sprintf(
3458                      $args['taxtitle'],
3459                      get_bloginfo( 'name' ),
3460                      $args['separator'],
3461                      $term->name,
3462                      $tax->labels->singular_name
3463                  );
3464  
3465                  $href = get_term_feed_link( $term->term_id, $term->taxonomy );
3466              }
3467          }
3468      } elseif ( is_author() ) {
3469          /**
3470           * Filters whether to display the author feed link.
3471           *
3472           * @since 6.1.0
3473           *
3474           * @param bool $show Whether to display the author feed link. Default true.
3475           */
3476          $show_author_feed = apply_filters( 'feed_links_extra_show_author_feed', true );
3477  
3478          if ( $show_author_feed ) {
3479              $author_id = (int) get_query_var( 'author' );
3480  
3481              $title = sprintf(
3482                  $args['authortitle'],
3483                  get_bloginfo( 'name' ),
3484                  $args['separator'],
3485                  get_the_author_meta( 'display_name', $author_id )
3486              );
3487  
3488              $href = get_author_feed_link( $author_id );
3489          }
3490      } elseif ( is_search() ) {
3491          /**
3492           * Filters whether to display the search results feed link.
3493           *
3494           * @since 6.1.0
3495           *
3496           * @param bool $show Whether to display the search results feed link. Default true.
3497           */
3498          $show_search_feed = apply_filters( 'feed_links_extra_show_search_feed', true );
3499  
3500          if ( $show_search_feed ) {
3501              $title = sprintf(
3502                  $args['searchtitle'],
3503                  get_bloginfo( 'name' ),
3504                  $args['separator'],
3505                  get_search_query( false )
3506              );
3507  
3508              $href = get_search_feed_link();
3509          }
3510      }
3511  
3512      if ( isset( $title ) && isset( $href ) ) {
3513          printf(
3514              '<link rel="alternate" type="%s" title="%s" href="%s" />' . "\n",
3515              feed_content_type(),
3516              esc_attr( $title ),
3517              esc_url( $href )
3518          );
3519      }
3520  }
3521  
3522  /**
3523   * Displays the link to the Really Simple Discovery service endpoint.
3524   *
3525   * @link http://archipelago.phrasewise.com/rsd
3526   * @since 2.0.0
3527   */
3528  function rsd_link() {
3529      printf(
3530          '<link rel="EditURI" type="application/rsd+xml" title="RSD" href="%s" />' . "\n",
3531          esc_url( site_url( 'xmlrpc.php?rsd', 'rpc' ) )
3532      );
3533  }
3534  
3535  /**
3536   * Displays a referrer `strict-origin-when-cross-origin` meta tag.
3537   *
3538   * Outputs a referrer `strict-origin-when-cross-origin` meta tag that tells the browser not to send
3539   * the full URL as a referrer to other sites when cross-origin assets are loaded.
3540   *
3541   * Typical usage is as a {@see 'wp_head'} callback:
3542   *
3543   *     add_action( 'wp_head', 'wp_strict_cross_origin_referrer' );
3544   *
3545   * @since 5.7.0
3546   */
3547  function wp_strict_cross_origin_referrer() {
3548      ?>
3549      <meta name='referrer' content='strict-origin-when-cross-origin' />
3550      <?php
3551  }
3552  
3553  /**
3554   * Displays site icon meta tags.
3555   *
3556   * @since 4.3.0
3557   *
3558   * @link https://www.whatwg.org/specs/web-apps/current-work/multipage/links.html#rel-icon HTML5 specification link icon.
3559   */
3560  function wp_site_icon() {
3561      if ( ! has_site_icon() && ! is_customize_preview() ) {
3562          return;
3563      }
3564  
3565      $meta_tags = array();
3566      $icon_32   = get_site_icon_url( 32 );
3567      if ( empty( $icon_32 ) && is_customize_preview() ) {
3568          $icon_32 = '/favicon.ico'; // Serve default favicon URL in customizer so element can be updated for preview.
3569      }
3570      if ( $icon_32 ) {
3571          $meta_tags[] = sprintf( '<link rel="icon" href="%s" sizes="32x32" />', esc_url( $icon_32 ) );
3572      }
3573      $icon_192 = get_site_icon_url( 192 );
3574      if ( $icon_192 ) {
3575          $meta_tags[] = sprintf( '<link rel="icon" href="%s" sizes="192x192" />', esc_url( $icon_192 ) );
3576      }
3577      $icon_180 = get_site_icon_url( 180 );
3578      if ( $icon_180 ) {
3579          $meta_tags[] = sprintf( '<link rel="apple-touch-icon" href="%s" />', esc_url( $icon_180 ) );
3580      }
3581      $icon_270 = get_site_icon_url( 270 );
3582      if ( $icon_270 ) {
3583          $meta_tags[] = sprintf( '<meta name="msapplication-TileImage" content="%s" />', esc_url( $icon_270 ) );
3584      }
3585  
3586      /**
3587       * Filters the site icon meta tags, so plugins can add their own.
3588       *
3589       * @since 4.3.0
3590       *
3591       * @param string[] $meta_tags Array of Site Icon meta tags.
3592       */
3593      $meta_tags = apply_filters( 'site_icon_meta_tags', $meta_tags );
3594      $meta_tags = array_filter( $meta_tags );
3595  
3596      foreach ( $meta_tags as $meta_tag ) {
3597          echo "$meta_tag\n";
3598      }
3599  }
3600  
3601  /**
3602   * Prints resource hints to browsers for pre-fetching, pre-rendering
3603   * and pre-connecting to websites.
3604   *
3605   * Gives hints to browsers to prefetch specific pages or render them
3606   * in the background, to perform DNS lookups or to begin the connection
3607   * handshake (DNS, TCP, TLS) in the background.
3608   *
3609   * These performance improving indicators work by using `<link rel"…">`.
3610   *
3611   * @since 4.6.0
3612   */
3613  function wp_resource_hints() {
3614      $hints = array(
3615          'dns-prefetch' => wp_dependencies_unique_hosts(),
3616          'preconnect'   => array(),
3617          'prefetch'     => array(),
3618          'prerender'    => array(),
3619      );
3620  
3621      foreach ( $hints as $relation_type => $urls ) {
3622          $unique_urls = array();
3623  
3624          /**
3625           * Filters domains and URLs for resource hints of the given relation type.
3626           *
3627           * @since 4.6.0
3628           * @since 4.7.0 The `$urls` parameter accepts arrays of specific HTML attributes
3629           *              as its child elements.
3630           *
3631           * @param array  $urls {
3632           *     Array of resources and their attributes, or URLs to print for resource hints.
3633           *
3634           *     @type array|string ...$0 {
3635           *         Array of resource attributes, or a URL string.
3636           *
3637           *         @type string $href        URL to include in resource hints. Required.
3638           *         @type string $as          How the browser should treat the resource
3639           *                                   (`script`, `style`, `image`, `document`, etc).
3640           *         @type string $crossorigin Indicates the CORS policy of the specified resource.
3641           *         @type float  $pr          Expected probability that the resource hint will be used.
3642           *         @type string $type        Type of the resource (`text/html`, `text/css`, etc).
3643           *     }
3644           * }
3645           * @param string $relation_type The relation type the URLs are printed for. One of
3646           *                              'dns-prefetch', 'preconnect', 'prefetch', or 'prerender'.
3647           */
3648          $urls = apply_filters( 'wp_resource_hints', $urls, $relation_type );
3649  
3650          foreach ( $urls as $key => $url ) {
3651              $atts = array();
3652  
3653              if ( is_array( $url ) ) {
3654                  if ( isset( $url['href'] ) ) {
3655                      $atts = $url;
3656                      $url  = $url['href'];
3657                  } else {
3658                      continue;
3659                  }
3660              }
3661  
3662              $url = esc_url( $url, array( 'http', 'https' ) );
3663  
3664              if ( ! $url ) {
3665                  continue;
3666              }
3667  
3668              if ( isset( $unique_urls[ $url ] ) ) {
3669                  continue;
3670              }
3671  
3672              if ( in_array( $relation_type, array( 'preconnect', 'dns-prefetch' ), true ) ) {
3673                  $parsed = wp_parse_url( $url );
3674  
3675                  if ( empty( $parsed['host'] ) ) {
3676                      continue;
3677                  }
3678  
3679                  if ( 'preconnect' === $relation_type && ! empty( $parsed['scheme'] ) ) {
3680                      $url = $parsed['scheme'] . '://' . $parsed['host'];
3681                  } else {
3682                      // Use protocol-relative URLs for dns-prefetch or if scheme is missing.
3683                      $url = '//' . $parsed['host'];
3684                  }
3685              }
3686  
3687              $atts['rel']  = $relation_type;
3688              $atts['href'] = $url;
3689  
3690              $unique_urls[ $url ] = $atts;
3691          }
3692  
3693          foreach ( $unique_urls as $atts ) {
3694              $html = '';
3695  
3696              foreach ( $atts as $attr => $value ) {
3697                  if ( ! is_scalar( $value )
3698                      || ( ! in_array( $attr, array( 'as', 'crossorigin', 'href', 'pr', 'rel', 'type' ), true ) && ! is_numeric( $attr ) )
3699                  ) {
3700  
3701                      continue;
3702                  }
3703  
3704                  $value = ( 'href' === $attr ) ? esc_url( $value ) : esc_attr( $value );
3705  
3706                  if ( ! is_string( $attr ) ) {
3707                      $html .= " $value";
3708                  } else {
3709                      $html .= " $attr='$value'";
3710                  }
3711              }
3712  
3713              $html = trim( $html );
3714  
3715              echo "<link $html />\n";
3716          }
3717      }
3718  }
3719  
3720  /**
3721   * Prints resource preloads directives to browsers.
3722   *
3723   * Gives directive to browsers to preload specific resources that website will
3724   * need very soon, this ensures that they are available earlier and are less
3725   * likely to block the page's render. Preload directives should not be used for
3726   * non-render-blocking elements, as then they would compete with the
3727   * render-blocking ones, slowing down the render.
3728   *
3729   * These performance improving indicators work by using `<link rel="preload">`.
3730   *
3731   * @link https://developer.mozilla.org/en-US/docs/Web/HTML/Link_types/preload
3732   * @link https://web.dev/preload-responsive-images/
3733   *
3734   * @since 6.1.0
3735   */
3736  function wp_preload_resources() {
3737      /**
3738       * Filters domains and URLs for resource preloads.
3739       *
3740       * @since 6.1.0
3741       * @since 6.6.0 Added the `$fetchpriority` attribute.
3742       *
3743       * @param array  $preload_resources {
3744       *     Array of resources and their attributes, or URLs to print for resource preloads.
3745       *
3746       *     @type array ...$0 {
3747       *         Array of resource attributes.
3748       *
3749       *         @type string $href          URL to include in resource preloads. Required.
3750       *         @type string $as            How the browser should treat the resource
3751       *                                     (`script`, `style`, `image`, `document`, etc).
3752       *         @type string $crossorigin   Indicates the CORS policy of the specified resource.
3753       *         @type string $type          Type of the resource (`text/html`, `text/css`, etc).
3754       *         @type string $media         Accepts media types or media queries. Allows responsive preloading.
3755       *         @type string $imagesizes    Responsive source size to the source Set.
3756       *         @type string $imagesrcset   Responsive image sources to the source set.
3757       *         @type string $fetchpriority Fetchpriority value for the resource.
3758       *     }
3759       * }
3760       */
3761      $preload_resources = apply_filters( 'wp_preload_resources', array() );
3762  
3763      if ( ! is_array( $preload_resources ) ) {
3764          return;
3765      }
3766  
3767      $unique_resources = array();
3768  
3769      // Parse the complete resource list and extract unique resources.
3770      foreach ( $preload_resources as $resource ) {
3771          if ( ! is_array( $resource ) ) {
3772              continue;
3773          }
3774  
3775          $attributes = $resource;
3776          if ( isset( $resource['href'] ) ) {
3777              $href = $resource['href'];
3778              if ( isset( $unique_resources[ $href ] ) ) {
3779                  continue;
3780              }
3781              $unique_resources[ $href ] = $attributes;
3782              // Media can use imagesrcset and not href.
3783          } elseif ( ( 'image' === $resource['as'] ) &&
3784              ( isset( $resource['imagesrcset'] ) || isset( $resource['imagesizes'] ) )
3785          ) {
3786              if ( isset( $unique_resources[ $resource['imagesrcset'] ] ) ) {
3787                  continue;
3788              }
3789              $unique_resources[ $resource['imagesrcset'] ] = $attributes;
3790          } else {
3791              continue;
3792          }
3793      }
3794  
3795      // Build and output the HTML for each unique resource.
3796      foreach ( $unique_resources as $unique_resource ) {
3797          $html = '';
3798  
3799          foreach ( $unique_resource as $resource_key => $resource_value ) {
3800              if ( ! is_scalar( $resource_value ) ) {
3801                  continue;
3802              }
3803  
3804              // Ignore non-supported attributes.
3805              $non_supported_attributes = array( 'as', 'crossorigin', 'href', 'imagesrcset', 'imagesizes', 'type', 'media', 'fetchpriority' );
3806              if ( ! in_array( $resource_key, $non_supported_attributes, true ) && ! is_numeric( $resource_key ) ) {
3807                  continue;
3808              }
3809  
3810              // imagesrcset only usable when preloading image, ignore otherwise.
3811              if ( ( 'imagesrcset' === $resource_key ) && ( ! isset( $unique_resource['as'] ) || ( 'image' !== $unique_resource['as'] ) ) ) {
3812                  continue;
3813              }
3814  
3815              // imagesizes only usable when preloading image and imagesrcset present, ignore otherwise.
3816              if ( ( 'imagesizes' === $resource_key ) &&
3817                  ( ! isset( $unique_resource['as'] ) || ( 'image' !== $unique_resource['as'] ) || ! isset( $unique_resource['imagesrcset'] ) )
3818              ) {
3819                  continue;
3820              }
3821  
3822              $resource_value = ( 'href' === $resource_key ) ? esc_url( $resource_value, array( 'http', 'https' ) ) : esc_attr( $resource_value );
3823  
3824              if ( ! is_string( $resource_key ) ) {
3825                  $html .= " $resource_value";
3826              } else {
3827                  $html .= " $resource_key='$resource_value'";
3828              }
3829          }
3830          $html = trim( $html );
3831  
3832          printf( "<link rel='preload' %s />\n", $html );
3833      }
3834  }
3835  
3836  /**
3837   * Retrieves a list of unique hosts of all enqueued scripts and styles.
3838   *
3839   * @since 4.6.0
3840   *
3841   * @global WP_Scripts $wp_scripts The WP_Scripts object for printing scripts.
3842   * @global WP_Styles  $wp_styles  The WP_Styles object for printing styles.
3843   *
3844   * @return string[] A list of unique hosts of enqueued scripts and styles.
3845   */
3846  function wp_dependencies_unique_hosts() {
3847      global $wp_scripts, $wp_styles;
3848  
3849      $unique_hosts = array();
3850  
3851      foreach ( array( $wp_scripts, $wp_styles ) as $dependencies ) {
3852          if ( $dependencies instanceof WP_Dependencies && ! empty( $dependencies->queue ) ) {
3853              foreach ( $dependencies->queue as $handle ) {
3854                  if ( ! isset( $dependencies->registered[ $handle ] ) ) {
3855                      continue;
3856                  }
3857  
3858                  /* @var _WP_Dependency $dependency */
3859                  $dependency = $dependencies->registered[ $handle ];
3860                  $parsed     = wp_parse_url( $dependency->src );
3861  
3862                  if ( ! empty( $parsed['host'] )
3863                      && ! in_array( $parsed['host'], $unique_hosts, true ) && $parsed['host'] !== $_SERVER['SERVER_NAME']
3864                  ) {
3865                      $unique_hosts[] = $parsed['host'];
3866                  }
3867              }
3868          }
3869      }
3870  
3871      return $unique_hosts;
3872  }
3873  
3874  /**
3875   * Determines whether the user can access the visual editor.
3876   *
3877   * Checks if the user can access the visual editor and that it's supported by the user's browser.
3878   *
3879   * @since 2.0.0
3880   *
3881   * @global bool $wp_rich_edit Whether the user can access the visual editor.
3882   * @global bool $is_gecko     Whether the browser is Gecko-based.
3883   * @global bool $is_opera     Whether the browser is Opera.
3884   * @global bool $is_safari    Whether the browser is Safari.
3885   * @global bool $is_chrome    Whether the browser is Chrome.
3886   * @global bool $is_IE        Whether the browser is Internet Explorer.
3887   * @global bool $is_edge      Whether the browser is Microsoft Edge.
3888   *
3889   * @return bool True if the user can access the visual editor, false otherwise.
3890   */
3891  function user_can_richedit() {
3892      global $wp_rich_edit, $is_gecko, $is_opera, $is_safari, $is_chrome, $is_IE, $is_edge;
3893  
3894      if ( ! isset( $wp_rich_edit ) ) {
3895          $wp_rich_edit = false;
3896  
3897          if ( 'true' === get_user_option( 'rich_editing' ) || ! is_user_logged_in() ) { // Default to 'true' for logged out users.
3898              if ( $is_safari ) {
3899                  $wp_rich_edit = ! wp_is_mobile() || ( preg_match( '!AppleWebKit/(\d+)!', $_SERVER['HTTP_USER_AGENT'], $match ) && (int) $match[1] >= 534 );
3900              } elseif ( $is_IE ) {
3901                  $wp_rich_edit = str_contains( $_SERVER['HTTP_USER_AGENT'], 'Trident/7.0;' );
3902              } elseif ( $is_gecko || $is_chrome || $is_edge || ( $is_opera && ! wp_is_mobile() ) ) {
3903                  $wp_rich_edit = true;
3904              }
3905          }
3906      }
3907  
3908      /**
3909       * Filters whether the user can access the visual editor.
3910       *
3911       * @since 2.1.0
3912       *
3913       * @param bool $wp_rich_edit Whether the user can access the visual editor.
3914       */
3915      return apply_filters( 'user_can_richedit', $wp_rich_edit );
3916  }
3917  
3918  /**
3919   * Finds out which editor should be displayed by default.
3920   *
3921   * Works out which of the editors to display as the current editor for a
3922   * user. The 'html' setting is for the "Code" editor tab.
3923   *
3924   * @since 2.5.0
3925   *
3926   * @return string Either 'tinymce', 'html', or 'test'
3927   */
3928  function wp_default_editor() {
3929      $r = user_can_richedit() ? 'tinymce' : 'html'; // Defaults.
3930      if ( wp_get_current_user() ) { // Look for cookie.
3931          $ed = get_user_setting( 'editor', 'tinymce' );
3932          $r  = ( in_array( $ed, array( 'tinymce', 'html', 'test' ), true ) ) ? $ed : $r;
3933      }
3934  
3935      /**
3936       * Filters which editor should be displayed by default.
3937       *
3938       * @since 2.5.0
3939       *
3940       * @param string $r Which editor should be displayed by default. Either 'tinymce', 'html', or 'test'.
3941       */
3942      return apply_filters( 'wp_default_editor', $r );
3943  }
3944  
3945  /**
3946   * Renders an editor.
3947   *
3948   * Using this function is the proper way to output all needed components for both TinyMCE and Quicktags.
3949   * _WP_Editors should not be used directly. See https://core.trac.wordpress.org/ticket/17144.
3950   *
3951   * NOTE: Once initialized the TinyMCE editor cannot be safely moved in the DOM. For that reason
3952   * running wp_editor() inside of a meta box is not a good idea unless only Quicktags is used.
3953   * On the post edit screen several actions can be used to include additional editors
3954   * containing TinyMCE: 'edit_page_form', 'edit_form_advanced' and 'dbx_post_sidebar'.
3955   * See https://core.trac.wordpress.org/ticket/19173 for more information.
3956   *
3957   * @see _WP_Editors::editor()
3958   * @see _WP_Editors::parse_settings()
3959   * @since 3.3.0
3960   *
3961   * @param string $content   Initial content for the editor.
3962   * @param string $editor_id HTML ID attribute value for the textarea and TinyMCE.
3963   *                          Should not contain square brackets.
3964   * @param array  $settings  See _WP_Editors::parse_settings() for description.
3965   */
3966  function wp_editor( $content, $editor_id, $settings = array() ) {
3967      if ( ! class_exists( '_WP_Editors', false ) ) {
3968          require  ABSPATH . WPINC . '/class-wp-editor.php';
3969      }
3970      _WP_Editors::editor( $content, $editor_id, $settings );
3971  }
3972  
3973  /**
3974   * Outputs the editor scripts, stylesheets, and default settings.
3975   *
3976   * The editor can be initialized when needed after page load.
3977   * See wp.editor.initialize() in wp-admin/js/editor.js for initialization options.
3978   *
3979   * @uses _WP_Editors
3980   * @since 4.8.0
3981   */
3982  function wp_enqueue_editor() {
3983      if ( ! class_exists( '_WP_Editors', false ) ) {
3984          require  ABSPATH . WPINC . '/class-wp-editor.php';
3985      }
3986  
3987      _WP_Editors::enqueue_default_editor();
3988  }
3989  
3990  /**
3991   * Enqueues assets needed by the code editor for the given settings.
3992   *
3993   * @since 4.9.0
3994   *
3995   * @see wp_enqueue_editor()
3996   * @see wp_get_code_editor_settings();
3997   * @see _WP_Editors::parse_settings()
3998   *
3999   * @param array $args {
4000   *     Args.
4001   *
4002   *     @type string   $type       The MIME type of the file to be edited.
4003   *     @type string   $file       Filename to be edited. Extension is used to sniff the type. Can be supplied as alternative to `$type` param.
4004   *     @type WP_Theme $theme      Theme being edited when on the theme file editor.
4005   *     @type string   $plugin     Plugin being edited when on the plugin file editor.
4006   *     @type array    $codemirror Additional CodeMirror setting overrides.
4007   *     @type array    $csslint    CSSLint rule overrides.
4008   *     @type array    $jshint     JSHint rule overrides.
4009   *     @type array    $htmlhint   HTMLHint rule overrides.
4010   * }
4011   * @return array|false Settings for the enqueued code editor, or false if the editor was not enqueued.
4012   */
4013  function wp_enqueue_code_editor( $args ) {
4014      if ( is_user_logged_in() && 'false' === wp_get_current_user()->syntax_highlighting ) {
4015          return false;
4016      }
4017  
4018      $settings = wp_get_code_editor_settings( $args );
4019  
4020      if ( empty( $settings ) || empty( $settings['codemirror'] ) ) {
4021          return false;
4022      }
4023  
4024      wp_enqueue_script( 'code-editor' );
4025      wp_enqueue_style( 'code-editor' );
4026  
4027      if ( isset( $settings['codemirror']['mode'] ) ) {
4028          $mode = $settings['codemirror']['mode'];
4029          if ( is_string( $mode ) ) {
4030              $mode = array(
4031                  'name' => $mode,
4032              );
4033          }
4034  
4035          if ( ! empty( $settings['codemirror']['lint'] ) ) {
4036              switch ( $mode['name'] ) {
4037                  case 'css':
4038                  case 'text/css':
4039                  case 'text/x-scss':
4040                  case 'text/x-less':
4041                      wp_enqueue_script( 'csslint' );
4042                      break;
4043                  case 'htmlmixed':
4044                  case 'text/html':
4045                  case 'php':
4046                  case 'application/x-httpd-php':
4047                  case 'text/x-php':
4048                      wp_enqueue_script( 'htmlhint' );
4049                      wp_enqueue_script( 'csslint' );
4050                      wp_enqueue_script( 'jshint' );
4051                      if ( ! current_user_can( 'unfiltered_html' ) ) {
4052                          wp_enqueue_script( 'htmlhint-kses' );
4053                      }
4054                      break;
4055                  case 'javascript':
4056                  case 'application/ecmascript':
4057                  case 'application/json':
4058                  case 'application/javascript':
4059                  case 'application/ld+json':
4060                  case 'text/typescript':
4061                  case 'application/typescript':
4062                      wp_enqueue_script( 'jshint' );
4063                      wp_enqueue_script( 'jsonlint' );
4064                      break;
4065              }
4066          }
4067      }
4068  
4069      wp_add_inline_script( 'code-editor', sprintf( 'jQuery.extend( wp.codeEditor.defaultSettings, %s );', wp_json_encode( $settings ) ) );
4070  
4071      /**
4072       * Fires when scripts and styles are enqueued for the code editor.
4073       *
4074       * @since 4.9.0
4075       *
4076       * @param array $settings Settings for the enqueued code editor.
4077       */
4078      do_action( 'wp_enqueue_code_editor', $settings );
4079  
4080      return $settings;
4081  }
4082  
4083  /**
4084   * Generates and returns code editor settings.
4085   *
4086   * @since 5.0.0
4087   *
4088   * @see wp_enqueue_code_editor()
4089   *
4090   * @param array $args {
4091   *     Args.
4092   *
4093   *     @type string   $type       The MIME type of the file to be edited.
4094   *     @type string   $file       Filename to be edited. Extension is used to sniff the type. Can be supplied as alternative to `$type` param.
4095   *     @type WP_Theme $theme      Theme being edited when on the theme file editor.
4096   *     @type string   $plugin     Plugin being edited when on the plugin file editor.
4097   *     @type array    $codemirror Additional CodeMirror setting overrides.
4098   *     @type array    $csslint    CSSLint rule overrides.
4099   *     @type array    $jshint     JSHint rule overrides.
4100   *     @type array    $htmlhint   HTMLHint rule overrides.
4101   * }
4102   * @return array|false Settings for the code editor.
4103   */
4104  function wp_get_code_editor_settings( $args ) {
4105      $settings = array(
4106          'codemirror' => array(
4107              'indentUnit'       => 4,
4108              'indentWithTabs'   => true,
4109              'inputStyle'       => 'contenteditable',
4110              'lineNumbers'      => true,
4111              'lineWrapping'     => true,
4112              'styleActiveLine'  => true,
4113              'continueComments' => true,
4114              'extraKeys'        => array(
4115                  'Ctrl-Space' => 'autocomplete',
4116                  'Ctrl-/'     => 'toggleComment',
4117                  'Cmd-/'      => 'toggleComment',
4118                  'Alt-F'      => 'findPersistent',
4119                  'Ctrl-F'     => 'findPersistent',
4120                  'Cmd-F'      => 'findPersistent',
4121              ),
4122              'direction'        => 'ltr', // Code is shown in LTR even in RTL languages.
4123              'gutters'          => array(),
4124          ),
4125          'csslint'    => array(
4126              'errors'                    => true, // Parsing errors.
4127              'box-model'                 => true,
4128              'display-property-grouping' => true,
4129              'duplicate-properties'      => true,
4130              'known-properties'          => true,
4131              'outline-none'              => true,
4132          ),
4133          'jshint'     => array(
4134              // The following are copied from <https://github.com/WordPress/wordpress-develop/blob/4.8.1/.jshintrc>.
4135              'boss'     => true,
4136              'curly'    => true,
4137              'eqeqeq'   => true,
4138              'eqnull'   => true,
4139              'es3'      => true,
4140              'expr'     => true,
4141              'immed'    => true,
4142              'noarg'    => true,
4143              'nonbsp'   => true,
4144              'onevar'   => true,
4145              'quotmark' => 'single',
4146              'trailing' => true,
4147              'undef'    => true,
4148              'unused'   => true,
4149  
4150              'browser'  => true,
4151  
4152              'globals'  => array(
4153                  '_'        => false,
4154                  'Backbone' => false,
4155                  'jQuery'   => false,
4156                  'JSON'     => false,
4157                  'wp'       => false,
4158              ),
4159          ),
4160          'htmlhint'   => array(
4161              'tagname-lowercase'        => true,
4162              'attr-lowercase'           => true,
4163              'attr-value-double-quotes' => false,
4164              'doctype-first'            => false,
4165              'tag-pair'                 => true,
4166              'spec-char-escape'         => true,
4167              'id-unique'                => true,
4168              'src-not-empty'            => true,
4169              'attr-no-duplication'      => true,
4170              'alt-require'              => true,
4171              'space-tab-mixed-disabled' => 'tab',
4172              'attr-unsafe-chars'        => true,
4173          ),
4174      );
4175  
4176      $type = '';
4177      if ( isset( $args['type'] ) ) {
4178          $type = $args['type'];
4179  
4180          // Remap MIME types to ones that CodeMirror modes will recognize.
4181          if ( 'application/x-patch' === $type || 'text/x-patch' === $type ) {
4182              $type = 'text/x-diff';
4183          }
4184      } elseif ( isset( $args['file'] ) && str_contains( basename( $args['file'] ), '.' ) ) {
4185          $extension = strtolower( pathinfo( $args['file'], PATHINFO_EXTENSION ) );
4186          foreach ( wp_get_mime_types() as $exts => $mime ) {
4187              if ( preg_match( '!^(' . $exts . ')$!i', $extension ) ) {
4188                  $type = $mime;
4189                  break;
4190              }
4191          }
4192  
4193          // Supply any types that are not matched by wp_get_mime_types().
4194          if ( empty( $type ) ) {
4195              switch ( $extension ) {
4196                  case 'conf':
4197                      $type = 'text/nginx';
4198                      break;
4199                  case 'css':
4200                      $type = 'text/css';
4201                      break;
4202                  case 'diff':
4203                  case 'patch':
4204                      $type = 'text/x-diff';
4205                      break;
4206                  case 'html':
4207                  case 'htm':
4208                      $type = 'text/html';
4209                      break;
4210                  case 'http':
4211                      $type = 'message/http';
4212                      break;
4213                  case 'js':
4214                      $type = 'text/javascript';
4215                      break;
4216                  case 'json':
4217                      $type = 'application/json';
4218                      break;
4219                  case 'jsx':
4220                      $type = 'text/jsx';
4221                      break;
4222                  case 'less':
4223                      $type = 'text/x-less';
4224                      break;
4225                  case 'md':
4226                      $type = 'text/x-gfm';
4227                      break;
4228                  case 'php':
4229                  case 'phtml':
4230                  case 'php3':
4231                  case 'php4':
4232                  case 'php5':
4233                  case 'php7':
4234                  case 'phps':
4235                      $type = 'application/x-httpd-php';
4236                      break;
4237                  case 'scss':
4238                      $type = 'text/x-scss';
4239                      break;
4240                  case 'sass':
4241                      $type = 'text/x-sass';
4242                      break;
4243                  case 'sh':
4244                  case 'bash':
4245                      $type = 'text/x-sh';
4246                      break;
4247                  case 'sql':
4248                      $type = 'text/x-sql';
4249                      break;
4250                  case 'svg':
4251                      $type = 'application/svg+xml';
4252                      break;
4253                  case 'xml':
4254                      $type = 'text/xml';
4255                      break;
4256                  case 'yml':
4257                  case 'yaml':
4258                      $type = 'text/x-yaml';
4259                      break;
4260                  case 'txt':
4261                  default:
4262                      $type = 'text/plain';
4263                      break;
4264              }
4265          }
4266      }
4267  
4268      if ( in_array( $type, array( 'text/css', 'text/x-scss', 'text/x-less', 'text/x-sass' ), true ) ) {
4269          $settings['codemirror'] = array_merge(
4270              $settings['codemirror'],
4271              array(
4272                  'mode'              => $type,
4273                  'lint'              => false,
4274                  'autoCloseBrackets' => true,
4275                  'matchBrackets'     => true,
4276              )
4277          );
4278      } elseif ( 'text/x-diff' === $type ) {
4279          $settings['codemirror'] = array_merge(
4280              $settings['codemirror'],
4281              array(
4282                  'mode' => 'diff',
4283              )
4284          );
4285      } elseif ( 'text/html' === $type ) {
4286          $settings['codemirror'] = array_merge(
4287              $settings['codemirror'],
4288              array(
4289                  'mode'              => 'htmlmixed',
4290                  'lint'              => true,
4291                  'autoCloseBrackets' => true,
4292                  'autoCloseTags'     => true,
4293                  'matchTags'         => array(
4294                      'bothTags' => true,
4295                  ),
4296              )
4297          );
4298  
4299          if ( ! current_user_can( 'unfiltered_html' ) ) {
4300              $settings['htmlhint']['kses'] = wp_kses_allowed_html( 'post' );
4301          }
4302      } elseif ( 'text/x-gfm' === $type ) {
4303          $settings['codemirror'] = array_merge(
4304              $settings['codemirror'],
4305              array(
4306                  'mode'                => 'gfm',
4307                  'highlightFormatting' => true,
4308              )
4309          );
4310      } elseif ( 'application/javascript' === $type || 'text/javascript' === $type ) {
4311          $settings['codemirror'] = array_merge(
4312              $settings['codemirror'],
4313              array(
4314                  'mode'              => 'javascript',
4315                  'lint'              => true,
4316                  'autoCloseBrackets' => true,
4317                  'matchBrackets'     => true,
4318              )
4319          );
4320      } elseif ( str_contains( $type, 'json' ) ) {
4321          $settings['codemirror'] = array_merge(
4322              $settings['codemirror'],
4323              array(
4324                  'mode'              => array(
4325                      'name' => 'javascript',
4326                  ),
4327                  'lint'              => true,
4328                  'autoCloseBrackets' => true,
4329                  'matchBrackets'     => true,
4330              )
4331          );
4332          if ( 'application/ld+json' === $type ) {
4333              $settings['codemirror']['mode']['jsonld'] = true;
4334          } else {
4335              $settings['codemirror']['mode']['json'] = true;
4336          }
4337      } elseif ( str_contains( $type, 'jsx' ) ) {
4338          $settings['codemirror'] = array_merge(
4339              $settings['codemirror'],
4340              array(
4341                  'mode'              => 'jsx',
4342                  'autoCloseBrackets' => true,
4343                  'matchBrackets'     => true,
4344              )
4345          );
4346      } elseif ( 'text/x-markdown' === $type ) {
4347          $settings['codemirror'] = array_merge(
4348              $settings['codemirror'],
4349              array(
4350                  'mode'                => 'markdown',
4351                  'highlightFormatting' => true,
4352              )
4353          );
4354      } elseif ( 'text/nginx' === $type ) {
4355          $settings['codemirror'] = array_merge(
4356              $settings['codemirror'],
4357              array(
4358                  'mode' => 'nginx',
4359              )
4360          );
4361      } elseif ( 'application/x-httpd-php' === $type ) {
4362          $settings['codemirror'] = array_merge(
4363              $settings['codemirror'],
4364              array(
4365                  'mode'              => 'php',
4366                  'autoCloseBrackets' => true,
4367                  'autoCloseTags'     => true,
4368                  'matchBrackets'     => true,
4369                  'matchTags'         => array(
4370                      'bothTags' => true,
4371                  ),
4372              )
4373          );
4374      } elseif ( 'text/x-sql' === $type || 'text/x-mysql' === $type ) {
4375          $settings['codemirror'] = array_merge(
4376              $settings['codemirror'],
4377              array(
4378                  'mode'              => 'sql',
4379                  'autoCloseBrackets' => true,
4380                  'matchBrackets'     => true,
4381              )
4382          );
4383      } elseif ( str_contains( $type, 'xml' ) ) {
4384          $settings['codemirror'] = array_merge(
4385              $settings['codemirror'],
4386              array(
4387                  'mode'              => 'xml',
4388                  'autoCloseBrackets' => true,
4389                  'autoCloseTags'     => true,
4390                  'matchTags'         => array(
4391                      'bothTags' => true,
4392                  ),
4393              )
4394          );
4395      } elseif ( 'text/x-yaml' === $type ) {
4396          $settings['codemirror'] = array_merge(
4397              $settings['codemirror'],
4398              array(
4399                  'mode' => 'yaml',
4400              )
4401          );
4402      } else {
4403          $settings['codemirror']['mode'] = $type;
4404      }
4405  
4406      if ( ! empty( $settings['codemirror']['lint'] ) ) {
4407          $settings['codemirror']['gutters'][] = 'CodeMirror-lint-markers';
4408      }
4409  
4410      // Let settings supplied via args override any defaults.
4411      foreach ( wp_array_slice_assoc( $args, array( 'codemirror', 'csslint', 'jshint', 'htmlhint' ) ) as $key => $value ) {
4412          $settings[ $key ] = array_merge(
4413              $settings[ $key ],
4414              $value
4415          );
4416      }
4417  
4418      /**
4419       * Filters settings that are passed into the code editor.
4420       *
4421       * Returning a falsey value will disable the syntax-highlighting code editor.
4422       *
4423       * @since 4.9.0
4424       *
4425       * @param array $settings The array of settings passed to the code editor.
4426       *                        A falsey value disables the editor.
4427       * @param array $args {
4428       *     Args passed when calling `get_code_editor_settings()`.
4429       *
4430       *     @type string   $type       The MIME type of the file to be edited.
4431       *     @type string   $file       Filename being edited.
4432       *     @type WP_Theme $theme      Theme being edited when on the theme file editor.
4433       *     @type string   $plugin     Plugin being edited when on the plugin file editor.
4434       *     @type array    $codemirror Additional CodeMirror setting overrides.
4435       *     @type array    $csslint    CSSLint rule overrides.
4436       *     @type array    $jshint     JSHint rule overrides.
4437       *     @type array    $htmlhint   HTMLHint rule overrides.
4438       * }
4439       */
4440      return apply_filters( 'wp_code_editor_settings', $settings, $args );
4441  }
4442  
4443  /**
4444   * Retrieves the contents of the search WordPress query variable.
4445   *
4446   * The search query string is passed through esc_attr() to ensure that it is safe
4447   * for placing in an HTML attribute.
4448   *
4449   * @since 2.3.0
4450   *
4451   * @param bool $escaped Whether the result is escaped. Default true.
4452   *                      Only use when you are later escaping it. Do not use unescaped.
4453   * @return string
4454   */
4455  function get_search_query( $escaped = true ) {
4456      /**
4457       * Filters the contents of the search query variable.
4458       *
4459       * @since 2.3.0
4460       *
4461       * @param mixed $search Contents of the search query variable.
4462       */
4463      $query = apply_filters( 'get_search_query', get_query_var( 's' ) );
4464  
4465      if ( $escaped ) {
4466          $query = esc_attr( $query );
4467      }
4468      return $query;
4469  }
4470  
4471  /**
4472   * Displays the contents of the search query variable.
4473   *
4474   * The search query string is passed through esc_attr() to ensure that it is safe
4475   * for placing in an HTML attribute.
4476   *
4477   * @since 2.1.0
4478   */
4479  function the_search_query() {
4480      /**
4481       * Filters the contents of the search query variable, for display.
4482       *
4483       * @since 2.3.0
4484       *
4485       * @param mixed $search Contents of the search query variable.
4486       */
4487      echo esc_attr( apply_filters( 'the_search_query', get_search_query( false ) ) );
4488  }
4489  
4490  /**
4491   * Gets the language attributes for the 'html' tag.
4492   *
4493   * Builds up a set of HTML attributes containing the text direction and language
4494   * information for the page.
4495   *
4496   * @since 4.3.0
4497   *
4498   * @param string $doctype Optional. The type of HTML document. Accepts 'xhtml' or 'html'. Default 'html'.
4499   * @return string A space-separated list of language attributes.
4500   */
4501  function get_language_attributes( $doctype = 'html' ) {
4502      $attributes = array();
4503  
4504      if ( function_exists( 'is_rtl' ) && is_rtl() ) {
4505          $attributes[] = 'dir="rtl"';
4506      }
4507  
4508      $lang = get_bloginfo( 'language' );
4509      if ( $lang ) {
4510          if ( 'text/html' === get_option( 'html_type' ) || 'html' === $doctype ) {
4511              $attributes[] = 'lang="' . esc_attr( $lang ) . '"';
4512          }
4513  
4514          if ( 'text/html' !== get_option( 'html_type' ) || 'xhtml' === $doctype ) {
4515              $attributes[] = 'xml:lang="' . esc_attr( $lang ) . '"';
4516          }
4517      }
4518  
4519      $output = implode( ' ', $attributes );
4520  
4521      /**
4522       * Filters the language attributes for display in the 'html' tag.
4523       *
4524       * @since 2.5.0
4525       * @since 4.3.0 Added the `$doctype` parameter.
4526       *
4527       * @param string $output A space-separated list of language attributes.
4528       * @param string $doctype The type of HTML document (xhtml|html).
4529       */
4530      return apply_filters( 'language_attributes', $output, $doctype );
4531  }
4532  
4533  /**
4534   * Displays the language attributes for the 'html' tag.
4535   *
4536   * Builds up a set of HTML attributes containing the text direction and language
4537   * information for the page.
4538   *
4539   * @since 2.1.0
4540   * @since 4.3.0 Converted into a wrapper for get_language_attributes().
4541   *
4542   * @param string $doctype Optional. The type of HTML document. Accepts 'xhtml' or 'html'. Default 'html'.
4543   */
4544  function language_attributes( $doctype = 'html' ) {
4545      echo get_language_attributes( $doctype );
4546  }
4547  
4548  /**
4549   * Retrieves paginated links for archive post pages.
4550   *
4551   * Technically, the function can be used to create paginated link list for any
4552   * area. The 'base' argument is used to reference the url, which will be used to
4553   * create the paginated links. The 'format' argument is then used for replacing
4554   * the page number. It is however, most likely and by default, to be used on the
4555   * archive post pages.
4556   *
4557   * The 'type' argument controls format of the returned value. The default is
4558   * 'plain', which is just a string with the links separated by a newline
4559   * character. The other possible values are either 'array' or 'list'. The
4560   * 'array' value will return an array of the paginated link list to offer full
4561   * control of display. The 'list' value will place all of the paginated links in
4562   * an unordered HTML list.
4563   *
4564   * The 'total' argument is the total amount of pages and is an integer. The
4565   * 'current' argument is the current page number and is also an integer.
4566   *
4567   * An example of the 'base' argument is "http://example.com/all_posts.php%_%"
4568   * and the '%_%' is required. The '%_%' will be replaced by the contents of in
4569   * the 'format' argument. An example for the 'format' argument is "?page=%#%"
4570   * and the '%#%' is also required. The '%#%' will be replaced with the page
4571   * number.
4572   *
4573   * You can include the previous and next links in the list by setting the
4574   * 'prev_next' argument to true, which it is by default. You can set the
4575   * previous text, by using the 'prev_text' argument. You can set the next text
4576   * by setting the 'next_text' argument.
4577   *
4578   * If the 'show_all' argument is set to true, then it will show all of the pages
4579   * instead of a short list of the pages near the current page. By default, the
4580   * 'show_all' is set to false and controlled by the 'end_size' and 'mid_size'
4581   * arguments. The 'end_size' argument is how many numbers on either the start
4582   * and the end list edges, by default is 1. The 'mid_size' argument is how many
4583   * numbers to either side of current page, but not including current page.
4584   *
4585   * It is possible to add query vars to the link by using the 'add_args' argument
4586   * and see add_query_arg() for more information.
4587   *
4588   * The 'before_page_number' and 'after_page_number' arguments allow users to
4589   * augment the links themselves. Typically this might be to add context to the
4590   * numbered links so that screen reader users understand what the links are for.
4591   * The text strings are added before and after the page number - within the
4592   * anchor tag.
4593   *
4594   * @since 2.1.0
4595   * @since 4.9.0 Added the `aria_current` argument.
4596   *
4597   * @global WP_Query   $wp_query   WordPress Query object.
4598   * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
4599   *
4600   * @param string|array $args {
4601   *     Optional. Array or string of arguments for generating paginated links for archives.
4602   *
4603   *     @type string $base               Base of the paginated url. Default empty.
4604   *     @type string $format             Format for the pagination structure. Default empty.
4605   *     @type int    $total              The total amount of pages. Default is the value WP_Query's
4606   *                                      `max_num_pages` or 1.
4607   *     @type int    $current            The current page number. Default is 'paged' query var or 1.
4608   *     @type string $aria_current       The value for the aria-current attribute. Possible values are 'page',
4609   *                                      'step', 'location', 'date', 'time', 'true', 'false'. Default is 'page'.
4610   *     @type bool   $show_all           Whether to show all pages. Default false.
4611   *     @type int    $end_size           How many numbers on either the start and the end list edges.
4612   *                                      Default 1.
4613   *     @type int    $mid_size           How many numbers to either side of the current pages. Default 2.
4614   *     @type bool   $prev_next          Whether to include the previous and next links in the list. Default true.
4615   *     @type string $prev_text          The previous page text. Default '&laquo; Previous'.
4616   *     @type string $next_text          The next page text. Default 'Next &raquo;'.
4617   *     @type string $type               Controls format of the returned value. Possible values are 'plain',
4618   *                                      'array' and 'list'. Default is 'plain'.
4619   *     @type array  $add_args           An array of query args to add. Default false.
4620   *     @type string $add_fragment       A string to append to each link. Default empty.
4621   *     @type string $before_page_number A string to appear before the page number. Default empty.
4622   *     @type string $after_page_number  A string to append after the page number. Default empty.
4623   * }
4624   * @return string|string[]|void String of page links or array of page links, depending on 'type' argument.
4625   *                              Void if total number of pages is less than 2.
4626   */
4627  function paginate_links( $args = '' ) {
4628      global $wp_query, $wp_rewrite;
4629  
4630      // Setting up default values based on the current URL.
4631      $pagenum_link = html_entity_decode( get_pagenum_link() );
4632      $url_parts    = explode( '?', $pagenum_link );
4633  
4634      // Get max pages and current page out of the current query, if available.
4635      $total   = isset( $wp_query->max_num_pages ) ? $wp_query->max_num_pages : 1;
4636      $current = get_query_var( 'paged' ) ? (int) get_query_var( 'paged' ) : 1;
4637  
4638      // Append the format placeholder to the base URL.
4639      $pagenum_link = trailingslashit( $url_parts[0] ) . '%_%';
4640  
4641      // URL base depends on permalink settings.
4642      $format  = $wp_rewrite->using_index_permalinks() && ! strpos( $pagenum_link, 'index.php' ) ? 'index.php/' : '';
4643      $format .= $wp_rewrite->using_permalinks() ? user_trailingslashit( $wp_rewrite->pagination_base . '/%#%', 'paged' ) : '?paged=%#%';
4644  
4645      $defaults = array(
4646          'base'               => $pagenum_link, // http://example.com/all_posts.php%_% : %_% is replaced by format (below).
4647          'format'             => $format, // ?page=%#% : %#% is replaced by the page number.
4648          'total'              => $total,
4649          'current'            => $current,
4650          'aria_current'       => 'page',
4651          'show_all'           => false,
4652          'prev_next'          => true,
4653          'prev_text'          => __( '&laquo; Previous' ),
4654          'next_text'          => __( 'Next &raquo;' ),
4655          'end_size'           => 1,
4656          'mid_size'           => 2,
4657          'type'               => 'plain',
4658          'add_args'           => array(), // Array of query args to add.
4659          'add_fragment'       => '',
4660          'before_page_number' => '',
4661          'after_page_number'  => '',
4662      );
4663  
4664      $args = wp_parse_args( $args, $defaults );
4665  
4666      if ( ! is_array( $args['add_args'] ) ) {
4667          $args['add_args'] = array();
4668      }
4669  
4670      // Merge additional query vars found in the original URL into 'add_args' array.
4671      if ( isset( $url_parts[1] ) ) {
4672          // Find the format argument.
4673          $format       = explode( '?', str_replace( '%_%', $args['format'], $args['base'] ) );
4674          $format_query = isset( $format[1] ) ? $format[1] : '';
4675          wp_parse_str( $format_query, $format_args );
4676  
4677          // Find the query args of the requested URL.
4678          wp_parse_str( $url_parts[1], $url_query_args );
4679  
4680          // Remove the format argument from the array of query arguments, to avoid overwriting custom format.
4681          foreach ( $format_args as $format_arg => $format_arg_value ) {
4682              unset( $url_query_args[ $format_arg ] );
4683          }
4684  
4685          $args['add_args'] = array_merge( $args['add_args'], urlencode_deep( $url_query_args ) );
4686      }
4687  
4688      // Who knows what else people pass in $args.
4689      $total = (int) $args['total'];
4690      if ( $total < 2 ) {
4691          return;
4692      }
4693      $current  = (int) $args['current'];
4694      $end_size = (int) $args['end_size']; // Out of bounds? Make it the default.
4695      if ( $end_size < 1 ) {
4696          $end_size = 1;
4697      }
4698      $mid_size = (int) $args['mid_size'];
4699      if ( $mid_size < 0 ) {
4700          $mid_size = 2;
4701      }
4702  
4703      $add_args   = $args['add_args'];
4704      $r          = '';
4705      $page_links = array();
4706      $dots       = false;
4707  
4708      if ( $args['prev_next'] && $current && 1 < $current ) :
4709          $link = str_replace( '%_%', 2 === $current ? '' : $args['format'], $args['base'] );
4710          $link = str_replace( '%#%', $current - 1, $link );
4711          if ( $add_args ) {
4712              $link = add_query_arg( $add_args, $link );
4713          }
4714          $link .= $args['add_fragment'];
4715  
4716          $page_links[] = sprintf(
4717              '<a class="prev page-numbers" href="%s">%s</a>',
4718              /**
4719               * Filters the paginated links for the given archive pages.
4720               *
4721               * @since 3.0.0
4722               *
4723               * @param string $link The paginated link URL.
4724               */
4725              esc_url( apply_filters( 'paginate_links', $link ) ),
4726              $args['prev_text']
4727          );
4728      endif;
4729  
4730      for ( $n = 1; $n <= $total; $n++ ) :
4731          if ( $n === $current ) :
4732              $page_links[] = sprintf(
4733                  '<span aria-current="%s" class="page-numbers current">%s</span>',
4734                  esc_attr( $args['aria_current'] ),
4735                  $args['before_page_number'] . number_format_i18n( $n ) . $args['after_page_number']
4736              );
4737  
4738              $dots = true;
4739          else :
4740              if ( $args['show_all'] || ( $n <= $end_size || ( $current && $n >= $current - $mid_size && $n <= $current + $mid_size ) || $n > $total - $end_size ) ) :
4741                  $link = str_replace( '%_%', 1 === $n ? '' : $args['format'], $args['base'] );
4742                  $link = str_replace( '%#%', $n, $link );
4743                  if ( $add_args ) {
4744                      $link = add_query_arg( $add_args, $link );
4745                  }
4746                  $link .= $args['add_fragment'];
4747  
4748                  $page_links[] = sprintf(
4749                      '<a class="page-numbers" href="%s">%s</a>',
4750                      /** This filter is documented in wp-includes/general-template.php */
4751                      esc_url( apply_filters( 'paginate_links', $link ) ),
4752                      $args['before_page_number'] . number_format_i18n( $n ) . $args['after_page_number']
4753                  );
4754  
4755                  $dots = true;
4756              elseif ( $dots && ! $args['show_all'] ) :
4757                  $page_links[] = '<span class="page-numbers dots">' . __( '&hellip;' ) . '</span>';
4758  
4759                  $dots = false;
4760              endif;
4761          endif;
4762      endfor;
4763  
4764      if ( $args['prev_next'] && $current && $current < $total ) :
4765          $link = str_replace( '%_%', $args['format'], $args['base'] );
4766          $link = str_replace( '%#%', $current + 1, $link );
4767          if ( $add_args ) {
4768              $link = add_query_arg( $add_args, $link );
4769          }
4770          $link .= $args['add_fragment'];
4771  
4772          $page_links[] = sprintf(
4773              '<a class="next page-numbers" href="%s">%s</a>',
4774              /** This filter is documented in wp-includes/general-template.php */
4775              esc_url( apply_filters( 'paginate_links', $link ) ),
4776              $args['next_text']
4777          );
4778      endif;
4779  
4780      switch ( $args['type'] ) {
4781          case 'array':
4782              return $page_links;
4783  
4784          case 'list':
4785              $r .= "<ul class='page-numbers'>\n\t<li>";
4786              $r .= implode( "</li>\n\t<li>", $page_links );
4787              $r .= "</li>\n</ul>\n";
4788              break;
4789  
4790          default:
4791              $r = implode( "\n", $page_links );
4792              break;
4793      }
4794  
4795      /**
4796       * Filters the HTML output of paginated links for archives.
4797       *
4798       * @since 5.7.0
4799       *
4800       * @param string $r    HTML output.
4801       * @param array  $args An array of arguments. See paginate_links()
4802       *                     for information on accepted arguments.
4803       */
4804      $r = apply_filters( 'paginate_links_output', $r, $args );
4805  
4806      return $r;
4807  }
4808  
4809  /**
4810   * Registers an admin color scheme css file.
4811   *
4812   * Allows a plugin to register a new admin color scheme. For example:
4813   *
4814   *     wp_admin_css_color( 'classic', __( 'Classic' ), admin_url( "css/colors-classic.css" ), array(
4815   *         '#07273E', '#14568A', '#D54E21', '#2683AE'
4816   *     ) );
4817   *
4818   * @since 2.5.0
4819   *
4820   * @global array $_wp_admin_css_colors
4821   *
4822   * @param string $key    The unique key for this theme.
4823   * @param string $name   The name of the theme.
4824   * @param string $url    The URL of the CSS file containing the color scheme.
4825   * @param array  $colors Optional. An array of CSS color definition strings which are used
4826   *                       to give the user a feel for the theme.
4827   * @param array  $icons {
4828   *     Optional. CSS color definitions used to color any SVG icons.
4829   *
4830   *     @type string $base    SVG icon base color.
4831   *     @type string $focus   SVG icon color on focus.
4832   *     @type string $current SVG icon color of current admin menu link.
4833   * }
4834   */
4835  function wp_admin_css_color( $key, $name, $url, $colors = array(), $icons = array() ) {
4836      global $_wp_admin_css_colors;
4837  
4838      if ( ! isset( $_wp_admin_css_colors ) ) {
4839          $_wp_admin_css_colors = array();
4840      }
4841  
4842      $_wp_admin_css_colors[ $key ] = (object) array(
4843          'name'        => $name,
4844          'url'         => $url,
4845          'colors'      => $colors,
4846          'icon_colors' => $icons,
4847      );
4848  }
4849  
4850  /**
4851   * Registers the default admin color schemes.
4852   *
4853   * Registers the initial set of eight color schemes in the Profile section
4854   * of the dashboard which allows for styling the admin menu and toolbar.
4855   *
4856   * @see wp_admin_css_color()
4857   *
4858   * @since 3.0.0
4859   */
4860  function register_admin_color_schemes() {
4861      $suffix  = is_rtl() ? '-rtl' : '';
4862      $suffix .= SCRIPT_DEBUG ? '' : '.min';
4863  
4864      wp_admin_css_color(
4865          'fresh',
4866          _x( 'Default', 'admin color scheme' ),
4867          false,
4868          array( '#1d2327', '#2c3338', '#2271b1', '#72aee6' ),
4869          array(
4870              'base'    => '#a7aaad',
4871              'focus'   => '#72aee6',
4872              'current' => '#fff',
4873          )
4874      );
4875  
4876      wp_admin_css_color(
4877          'light',
4878          _x( 'Light', 'admin color scheme' ),
4879          admin_url( "css/colors/light/colors$suffix.css" ),
4880          array( '#e5e5e5', '#999', '#d64e07', '#04a4cc' ),
4881          array(
4882              'base'    => '#999',
4883              'focus'   => '#ccc',
4884              'current' => '#ccc',
4885          )
4886      );
4887  
4888      wp_admin_css_color(
4889          'modern',
4890          _x( 'Modern', 'admin color scheme' ),
4891          admin_url( "css/colors/modern/colors$suffix.css" ),
4892          array( '#1e1e1e', '#3858e9', '#7b90ff' ),
4893          array(
4894              'base'    => '#f3f1f1',
4895              'focus'   => '#fff',
4896              'current' => '#fff',
4897          )
4898      );
4899  
4900      wp_admin_css_color(
4901          'blue',
4902          _x( 'Blue', 'admin color scheme' ),
4903          admin_url( "css/colors/blue/colors$suffix.css" ),
4904          array( '#096484', '#4796b3', '#52accc', '#74B6CE' ),
4905          array(
4906              'base'    => '#e5f8ff',
4907              'focus'   => '#fff',
4908              'current' => '#fff',
4909          )
4910      );
4911  
4912      wp_admin_css_color(
4913          'midnight',
4914          _x( 'Midnight', 'admin color scheme' ),
4915          admin_url( "css/colors/midnight/colors$suffix.css" ),
4916          array( '#25282b', '#363b3f', '#69a8bb', '#e14d43' ),
4917          array(
4918              'base'    => '#f1f2f3',
4919              'focus'   => '#fff',
4920              'current' => '#fff',
4921          )
4922      );
4923  
4924      wp_admin_css_color(
4925          'sunrise',
4926          _x( 'Sunrise', 'admin color scheme' ),
4927          admin_url( "css/colors/sunrise/colors$suffix.css" ),
4928          array( '#b43c38', '#cf4944', '#dd823b', '#ccaf0b' ),
4929          array(
4930              'base'    => '#f3f1f1',
4931              'focus'   => '#fff',
4932              'current' => '#fff',
4933          )
4934      );
4935  
4936      wp_admin_css_color(
4937          'ectoplasm',
4938          _x( 'Ectoplasm', 'admin color scheme' ),
4939          admin_url( "css/colors/ectoplasm/colors$suffix.css" ),
4940          array( '#413256', '#523f6d', '#a3b745', '#d46f15' ),
4941          array(
4942              'base'    => '#ece6f6',
4943              'focus'   => '#fff',
4944              'current' => '#fff',
4945          )
4946      );
4947  
4948      wp_admin_css_color(
4949          'ocean',
4950          _x( 'Ocean', 'admin color scheme' ),
4951          admin_url( "css/colors/ocean/colors$suffix.css" ),
4952          array( '#627c83', '#738e96', '#9ebaa0', '#aa9d88' ),
4953          array(
4954              'base'    => '#f2fcff',
4955              'focus'   => '#fff',
4956              'current' => '#fff',
4957          )
4958      );
4959  
4960      wp_admin_css_color(
4961          'coffee',
4962          _x( 'Coffee', 'admin color scheme' ),
4963          admin_url( "css/colors/coffee/colors$suffix.css" ),
4964          array( '#46403c', '#59524c', '#c7a589', '#9ea476' ),
4965          array(
4966              'base'    => '#f3f2f1',
4967              'focus'   => '#fff',
4968              'current' => '#fff',
4969          )
4970      );
4971  }
4972  
4973  /**
4974   * Displays the URL of a WordPress admin CSS file.
4975   *
4976   * @see WP_Styles::_css_href() and its {@see 'style_loader_src'} filter.
4977   *
4978   * @since 2.3.0
4979   *
4980   * @param string $file file relative to wp-admin/ without its ".css" extension.
4981   * @return string
4982   */
4983  function wp_admin_css_uri( $file = 'wp-admin' ) {
4984      if ( defined( 'WP_INSTALLING' ) ) {
4985          $_file = "./$file.css";
4986      } else {
4987          $_file = admin_url( "$file.css" );
4988      }
4989      $_file = add_query_arg( 'version', get_bloginfo( 'version' ), $_file );
4990  
4991      /**
4992       * Filters the URI of a WordPress admin CSS file.
4993       *
4994       * @since 2.3.0
4995       *
4996       * @param string $_file Relative path to the file with query arguments attached.
4997       * @param string $file  Relative path to the file, minus its ".css" extension.
4998       */
4999      return apply_filters( 'wp_admin_css_uri', $_file, $file );
5000  }
5001  
5002  /**
5003   * Enqueues or directly prints a stylesheet link to the specified CSS file.
5004   *
5005   * "Intelligently" decides to enqueue or to print the CSS file. If the
5006   * {@see 'wp_print_styles'} action has *not* yet been called, the CSS file will be
5007   * enqueued. If the {@see 'wp_print_styles'} action has been called, the CSS link will
5008   * be printed. Printing may be forced by passing true as the $force_echo
5009   * (second) parameter.
5010   *
5011   * For backward compatibility with WordPress 2.3 calling method: If the $file
5012   * (first) parameter does not correspond to a registered CSS file, we assume
5013   * $file is a file relative to wp-admin/ without its ".css" extension. A
5014   * stylesheet link to that generated URL is printed.
5015   *
5016   * @since 2.3.0
5017   *
5018   * @param string $file       Optional. Style handle name or file name (without ".css" extension) relative
5019   *                           to wp-admin/. Defaults to 'wp-admin'.
5020   * @param bool   $force_echo Optional. Force the stylesheet link to be printed rather than enqueued.
5021   */
5022  function wp_admin_css( $file = 'wp-admin', $force_echo = false ) {
5023      // For backward compatibility.
5024      $handle = str_starts_with( $file, 'css/' ) ? substr( $file, 4 ) : $file;
5025  
5026      if ( wp_styles()->query( $handle ) ) {
5027          if ( $force_echo || did_action( 'wp_print_styles' ) ) {
5028              // We already printed the style queue. Print this one immediately.
5029              wp_print_styles( $handle );
5030          } else {
5031              // Add to style queue.
5032              wp_enqueue_style( $handle );
5033          }
5034          return;
5035      }
5036  
5037      $stylesheet_link = sprintf(
5038          "<link rel='stylesheet' href='%s' type='text/css' />\n",
5039          esc_url( wp_admin_css_uri( $file ) )
5040      );
5041  
5042      /**
5043       * Filters the stylesheet link to the specified CSS file.
5044       *
5045       * If the site is set to display right-to-left, the RTL stylesheet link
5046       * will be used instead.
5047       *
5048       * @since 2.3.0
5049       * @param string $stylesheet_link HTML link element for the stylesheet.
5050       * @param string $file            Style handle name or filename (without ".css" extension)
5051       *                                relative to wp-admin/. Defaults to 'wp-admin'.
5052       */
5053      echo apply_filters( 'wp_admin_css', $stylesheet_link, $file );
5054  
5055      if ( function_exists( 'is_rtl' ) && is_rtl() ) {
5056          $rtl_stylesheet_link = sprintf(
5057              "<link rel='stylesheet' href='%s' type='text/css' />\n",
5058              esc_url( wp_admin_css_uri( "$file-rtl" ) )
5059          );
5060  
5061          /** This filter is documented in wp-includes/general-template.php */
5062          echo apply_filters( 'wp_admin_css', $rtl_stylesheet_link, "$file-rtl" );
5063      }
5064  }
5065  
5066  /**
5067   * Enqueues the default ThickBox js and css.
5068   *
5069   * If any of the settings need to be changed, this can be done with another js
5070   * file similar to media-upload.js. That file should
5071   * require array('thickbox') to ensure it is loaded after.
5072   *
5073   * @since 2.5.0
5074   */
5075  function add_thickbox() {
5076      wp_enqueue_script( 'thickbox' );
5077      wp_enqueue_style( 'thickbox' );
5078  
5079      if ( is_network_admin() ) {
5080          add_action( 'admin_head', '_thickbox_path_admin_subfolder' );
5081      }
5082  }
5083  
5084  /**
5085   * Displays the XHTML generator that is generated on the wp_head hook.
5086   *
5087   * See {@see 'wp_head'}.
5088   *
5089   * @since 2.5.0
5090   */
5091  function wp_generator() {
5092      /**
5093       * Filters the output of the XHTML generator tag.
5094       *
5095       * @since 2.5.0
5096       *
5097       * @param string $generator_type The XHTML generator.
5098       */
5099      the_generator( apply_filters( 'wp_generator_type', 'xhtml' ) );
5100  }
5101  
5102  /**
5103   * Displays the generator XML or Comment for RSS, ATOM, etc.
5104   *
5105   * Returns the correct generator type for the requested output format. Allows
5106   * for a plugin to filter generators overall the {@see 'the_generator'} filter.
5107   *
5108   * @since 2.5.0
5109   *
5110   * @param string $type The type of generator to output - (html|xhtml|atom|rss2|rdf|comment|export).
5111   */
5112  function the_generator( $type ) {
5113      /**
5114       * Filters the output of the XHTML generator tag, for display.
5115       *
5116       * @since 2.5.0
5117       *
5118       * @param string $generator_type The generator output.
5119       * @param string $type           The type of generator to output. Accepts 'html',
5120       *                               'xhtml', 'atom', 'rss2', 'rdf', 'comment', 'export'.
5121       */
5122      echo apply_filters( 'the_generator', get_the_generator( $type ), $type ) . "\n";
5123  }
5124  
5125  /**
5126   * Creates the generator XML or Comment for RSS, ATOM, etc.
5127   *
5128   * Returns the correct generator type for the requested output format. Allows
5129   * for a plugin to filter generators on an individual basis using the
5130   * {@see 'get_the_generator_$type'} filter.
5131   *
5132   * @since 2.5.0
5133   *
5134   * @param string $type The type of generator to return - (html|xhtml|atom|rss2|rdf|comment|export).
5135   * @return string|void The HTML content for the generator.
5136   */
5137  function get_the_generator( $type = '' ) {
5138      if ( empty( $type ) ) {
5139  
5140          $current_filter = current_filter();
5141          if ( empty( $current_filter ) ) {
5142              return;
5143          }
5144  
5145          switch ( $current_filter ) {
5146              case 'rss2_head':
5147              case 'commentsrss2_head':
5148                  $type = 'rss2';
5149                  break;
5150              case 'rss_head':
5151              case 'opml_head':
5152                  $type = 'comment';
5153                  break;
5154              case 'rdf_header':
5155                  $type = 'rdf';
5156                  break;
5157              case 'atom_head':
5158              case 'comments_atom_head':
5159              case 'app_head':
5160                  $type = 'atom';
5161                  break;
5162          }
5163      }
5164  
5165      switch ( $type ) {
5166          case 'html':
5167              $gen = '<meta name="generator" content="WordPress ' . esc_attr( get_bloginfo( 'version' ) ) . '">';
5168              break;
5169          case 'xhtml':
5170              $gen = '<meta name="generator" content="WordPress ' . esc_attr( get_bloginfo( 'version' ) ) . '" />';
5171              break;
5172          case 'atom':
5173              $gen = '<generator uri="https://wordpress.org/" version="' . esc_attr( get_bloginfo_rss( 'version' ) ) . '">WordPress</generator>';
5174              break;
5175          case 'rss2':
5176              $gen = '<generator>' . sanitize_url( 'https://wordpress.org/?v=' . get_bloginfo_rss( 'version' ) ) . '</generator>';
5177              break;
5178          case 'rdf':
5179              $gen = '<admin:generatorAgent rdf:resource="' . sanitize_url( 'https://wordpress.org/?v=' . get_bloginfo_rss( 'version' ) ) . '" />';
5180              break;
5181          case 'comment':
5182              $gen = '<!-- generator="WordPress/' . esc_attr( get_bloginfo( 'version' ) ) . '" -->';
5183              break;
5184          case 'export':
5185              $gen = '<!-- generator="WordPress/' . esc_attr( get_bloginfo_rss( 'version' ) ) . '" created="' . gmdate( 'Y-m-d H:i' ) . '" -->';
5186              break;
5187      }
5188  
5189      /**
5190       * Filters the HTML for the retrieved generator type.
5191       *
5192       * The dynamic portion of the hook name, `$type`, refers to the generator type.
5193       *
5194       * Possible hook names include:
5195       *
5196       *  - `get_the_generator_atom`
5197       *  - `get_the_generator_comment`
5198       *  - `get_the_generator_export`
5199       *  - `get_the_generator_html`
5200       *  - `get_the_generator_rdf`
5201       *  - `get_the_generator_rss2`
5202       *  - `get_the_generator_xhtml`
5203       *
5204       * @since 2.5.0
5205       *
5206       * @param string $gen  The HTML markup output to wp_head().
5207       * @param string $type The type of generator. Accepts 'html', 'xhtml', 'atom',
5208       *                     'rss2', 'rdf', 'comment', 'export'.
5209       */
5210      return apply_filters( "get_the_generator_{$type}", $gen, $type );
5211  }
5212  
5213  /**
5214   * Outputs the HTML checked attribute.
5215   *
5216   * Compares the first two arguments and if identical marks as checked.
5217   *
5218   * @since 1.0.0
5219   *
5220   * @param mixed $checked One of the values to compare.
5221   * @param mixed $current Optional. The other value to compare if not just true.
5222   *                       Default true.
5223   * @param bool  $display Optional. Whether to echo or just return the string.
5224   *                       Default true.
5225   * @return string HTML attribute or empty string.
5226   */
5227  function checked( $checked, $current = true, $display = true ) {
5228      return __checked_selected_helper( $checked, $current, $display, 'checked' );
5229  }
5230  
5231  /**
5232   * Outputs the HTML selected attribute.
5233   *
5234   * Compares the first two arguments and if identical marks as selected.
5235   *
5236   * @since 1.0.0
5237   *
5238   * @param mixed $selected One of the values to compare.
5239   * @param mixed $current  Optional. The other value to compare if not just true.
5240   *                        Default true.
5241   * @param bool  $display  Optional. Whether to echo or just return the string.
5242   *                        Default true.
5243   * @return string HTML attribute or empty string.
5244   */
5245  function selected( $selected, $current = true, $display = true ) {
5246      return __checked_selected_helper( $selected, $current, $display, 'selected' );
5247  }
5248  
5249  /**
5250   * Outputs the HTML disabled attribute.
5251   *
5252   * Compares the first two arguments and if identical marks as disabled.
5253   *
5254   * @since 3.0.0
5255   *
5256   * @param mixed $disabled One of the values to compare.
5257   * @param mixed $current  Optional. The other value to compare if not just true.
5258   *                        Default true.
5259   * @param bool  $display  Optional. Whether to echo or just return the string.
5260   *                        Default true.
5261   * @return string HTML attribute or empty string.
5262   */
5263  function disabled( $disabled, $current = true, $display = true ) {
5264      return __checked_selected_helper( $disabled, $current, $display, 'disabled' );
5265  }
5266  
5267  /**
5268   * Outputs the HTML readonly attribute.
5269   *
5270   * Compares the first two arguments and if identical marks as readonly.
5271   *
5272   * @since 5.9.0
5273   *
5274   * @param mixed $readonly_value One of the values to compare.
5275   * @param mixed $current        Optional. The other value to compare if not just true.
5276   *                              Default true.
5277   * @param bool  $display        Optional. Whether to echo or just return the string.
5278   *                              Default true.
5279   * @return string HTML attribute or empty string.
5280   */
5281  function wp_readonly( $readonly_value, $current = true, $display = true ) {
5282      return __checked_selected_helper( $readonly_value, $current, $display, 'readonly' );
5283  }
5284  
5285  /*
5286   * Include a compat `readonly()` function on PHP < 8.1. Since PHP 8.1,
5287   * `readonly` is a reserved keyword and cannot be used as a function name.
5288   * In order to avoid PHP parser errors, this function was extracted
5289   * to a separate file and is only included conditionally on PHP < 8.1.
5290   */
5291  if ( PHP_VERSION_ID < 80100 ) {
5292      require_once  __DIR__ . '/php-compat/readonly.php';
5293  }
5294  
5295  /**
5296   * Private helper function for checked, selected, disabled and readonly.
5297   *
5298   * Compares the first two arguments and if identical marks as `$type`.
5299   *
5300   * @since 2.8.0
5301   * @access private
5302   *
5303   * @param mixed  $helper  One of the values to compare.
5304   * @param mixed  $current The other value to compare if not just true.
5305   * @param bool   $display Whether to echo or just return the string.
5306   * @param string $type    The type of checked|selected|disabled|readonly we are doing.
5307   * @return string HTML attribute or empty string.
5308   */
5309  function __checked_selected_helper( $helper, $current, $display, $type ) { // phpcs:ignore WordPress.NamingConventions.ValidFunctionName.FunctionDoubleUnderscore,PHPCompatibility.FunctionNameRestrictions.ReservedFunctionNames.FunctionDoubleUnderscore
5310      if ( (string) $helper === (string) $current ) {
5311          $result = " $type='$type'";
5312      } else {
5313          $result = '';
5314      }
5315  
5316      if ( $display ) {
5317          echo $result;
5318      }
5319  
5320      return $result;
5321  }
5322  
5323  /**
5324   * Assigns a visual indicator for required form fields.
5325   *
5326   * @since 6.1.0
5327   *
5328   * @return string Indicator glyph wrapped in a `span` tag.
5329   */
5330  function wp_required_field_indicator() {
5331      /* translators: Character to identify required form fields. */
5332      $glyph     = __( '*' );
5333      $indicator = '<span class="required">' . esc_html( $glyph ) . '</span>';
5334  
5335      /**
5336       * Filters the markup for a visual indicator of required form fields.
5337       *
5338       * @since 6.1.0
5339       *
5340       * @param string $indicator Markup for the indicator element.
5341       */
5342      return apply_filters( 'wp_required_field_indicator', $indicator );
5343  }
5344  
5345  /**
5346   * Creates a message to explain required form fields.
5347   *
5348   * @since 6.1.0
5349   *
5350   * @return string Message text and glyph wrapped in a `span` tag.
5351   */
5352  function wp_required_field_message() {
5353      $message = sprintf(
5354          '<span class="required-field-message">%s</span>',
5355          /* translators: %s: Asterisk symbol (*). */
5356          sprintf( __( 'Required fields are marked %s' ), wp_required_field_indicator() )
5357      );
5358  
5359      /**
5360       * Filters the message to explain required form fields.
5361       *
5362       * @since 6.1.0
5363       *
5364       * @param string $message Message text and glyph wrapped in a `span` tag.
5365       */
5366      return apply_filters( 'wp_required_field_message', $message );
5367  }
5368  
5369  /**
5370   * Default settings for heartbeat.
5371   *
5372   * Outputs the nonce used in the heartbeat XHR.
5373   *
5374   * @since 3.6.0
5375   *
5376   * @param array $settings
5377   * @return array Heartbeat settings.
5378   */
5379  function wp_heartbeat_settings( $settings ) {
5380      if ( ! is_admin() ) {
5381          $settings['ajaxurl'] = admin_url( 'admin-ajax.php', 'relative' );
5382      }
5383  
5384      if ( is_user_logged_in() ) {
5385          $settings['nonce'] = wp_create_nonce( 'heartbeat-nonce' );
5386      }
5387  
5388      return $settings;
5389  }


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