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PHP Cross Reference of WordPress Trunk (Updated Daily) |
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1 <?php 2 /** 3 * WordPress Feed API 4 * 5 * Many of the functions used in here belong in The Loop, or The Loop for the 6 * Feeds. 7 * 8 * @package WordPress 9 * @subpackage Feed 10 * @since 2.1.0 11 */ 12 13 /** 14 * Retrieves RSS container for the bloginfo function. 15 * 16 * You can retrieve anything that you can using the get_bloginfo() function. 17 * Everything will be stripped of tags and characters converted, when the values 18 * are retrieved for use in the feeds. 19 * 20 * @since 1.5.1 21 * 22 * @see get_bloginfo() For the list of possible values to display. 23 * 24 * @param string $show See get_bloginfo() for possible values. 25 * @return string 26 */ 27 function get_bloginfo_rss( $show = '' ) { 28 $info = strip_tags( get_bloginfo( $show ) ); 29 /** 30 * Filters the bloginfo for use in RSS feeds. 31 * 32 * @since 2.2.0 33 * 34 * @see convert_chars() 35 * @see get_bloginfo() 36 * 37 * @param string $info Converted string value of the blog information. 38 * @param string $show The type of blog information to retrieve. 39 */ 40 return apply_filters( 'get_bloginfo_rss', convert_chars( $info ), $show ); 41 } 42 43 /** 44 * Displays RSS container for the bloginfo function. 45 * 46 * You can retrieve anything that you can using the get_bloginfo() function. 47 * Everything will be stripped of tags and characters converted, when the values 48 * are retrieved for use in the feeds. 49 * 50 * @since 0.71 51 * 52 * @see get_bloginfo() For the list of possible values to display. 53 * 54 * @param string $show See get_bloginfo() for possible values. 55 */ 56 function bloginfo_rss( $show = '' ) { 57 /** 58 * Filters the bloginfo for display in RSS feeds. 59 * 60 * @since 2.1.0 61 * 62 * @see get_bloginfo() 63 * 64 * @param string $rss_container RSS container for the blog information. 65 * @param string $show The type of blog information to retrieve. 66 */ 67 echo apply_filters( 'bloginfo_rss', get_bloginfo_rss( $show ), $show ); 68 } 69 70 /** 71 * Retrieves the default feed. 72 * 73 * The default feed is 'rss2', unless a plugin changes it through the 74 * {@see 'default_feed'} filter. 75 * 76 * @since 2.5.0 77 * 78 * @return string Default feed, or for example 'rss2', 'atom', etc. 79 */ 80 function get_default_feed() { 81 /** 82 * Filters the default feed type. 83 * 84 * @since 2.5.0 85 * 86 * @param string $feed_type Type of default feed. Possible values include 'rss2', 'atom'. 87 * Default 'rss2'. 88 */ 89 $default_feed = apply_filters( 'default_feed', 'rss2' ); 90 91 return ( 'rss' === $default_feed ) ? 'rss2' : $default_feed; 92 } 93 94 /** 95 * Retrieves the blog title for the feed title. 96 * 97 * @since 2.2.0 98 * @since 4.4.0 The optional `$sep` parameter was deprecated and renamed to `$deprecated`. 99 * 100 * @param string $deprecated Unused. 101 * @return string The document title. 102 */ 103 function get_wp_title_rss( $deprecated = '–' ) { 104 if ( '–' !== $deprecated ) { 105 /* translators: %s: 'document_title_separator' filter name. */ 106 _deprecated_argument( __FUNCTION__, '4.4.0', sprintf( __( 'Use the %s filter instead.' ), '<code>document_title_separator</code>' ) ); 107 } 108 109 /** 110 * Filters the blog title for use as the feed title. 111 * 112 * @since 2.2.0 113 * @since 4.4.0 The `$sep` parameter was deprecated and renamed to `$deprecated`. 114 * 115 * @param string $title The current blog title. 116 * @param string $deprecated Unused. 117 */ 118 return apply_filters( 'get_wp_title_rss', wp_get_document_title(), $deprecated ); 119 } 120 121 /** 122 * Displays the blog title for display of the feed title. 123 * 124 * @since 2.2.0 125 * @since 4.4.0 The optional `$sep` parameter was deprecated and renamed to `$deprecated`. 126 * 127 * @param string $deprecated Unused. 128 */ 129 function wp_title_rss( $deprecated = '–' ) { 130 if ( '–' !== $deprecated ) { 131 /* translators: %s: 'document_title_separator' filter name. */ 132 _deprecated_argument( __FUNCTION__, '4.4.0', sprintf( __( 'Use the %s filter instead.' ), '<code>document_title_separator</code>' ) ); 133 } 134 135 /** 136 * Filters the blog title for display of the feed title. 137 * 138 * @since 2.2.0 139 * @since 4.4.0 The `$sep` parameter was deprecated and renamed to `$deprecated`. 140 * 141 * @see get_wp_title_rss() 142 * 143 * @param string $wp_title_rss The current blog title. 144 * @param string $deprecated Unused. 145 */ 146 echo apply_filters( 'wp_title_rss', get_wp_title_rss(), $deprecated ); 147 } 148 149 /** 150 * Retrieves the current post title for the feed. 151 * 152 * @since 2.0.0 153 * @since 6.6.0 Added the `$post` parameter. 154 * 155 * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global $post. 156 * @return string Current post title. 157 */ 158 function get_the_title_rss( $post = 0 ) { 159 $title = get_the_title( $post ); 160 161 /** 162 * Filters the post title for use in a feed. 163 * 164 * @since 1.2.0 165 * 166 * @param string $title The current post title. 167 */ 168 return apply_filters( 'the_title_rss', $title ); 169 } 170 171 /** 172 * Displays the post title in the feed. 173 * 174 * @since 0.71 175 */ 176 function the_title_rss() { 177 echo get_the_title_rss(); 178 } 179 180 /** 181 * Retrieves the post content for feeds. 182 * 183 * @since 2.9.0 184 * 185 * @see get_the_content() 186 * 187 * @param string $feed_type The type of feed. rss2 | atom | rss | rdf 188 * @return string The filtered content. 189 */ 190 function get_the_content_feed( $feed_type = null ) { 191 if ( ! $feed_type ) { 192 $feed_type = get_default_feed(); 193 } 194 195 /** This filter is documented in wp-includes/post-template.php */ 196 $content = apply_filters( 'the_content', get_the_content() ); 197 $content = str_replace( ']]>', ']]>', $content ); 198 199 /** 200 * Filters the post content for use in feeds. 201 * 202 * @since 2.9.0 203 * 204 * @param string $content The current post content. 205 * @param string $feed_type Type of feed. Possible values include 'rss2', 'atom'. 206 * Default 'rss2'. 207 */ 208 return apply_filters( 'the_content_feed', $content, $feed_type ); 209 } 210 211 /** 212 * Displays the post content for feeds. 213 * 214 * @since 2.9.0 215 * 216 * @param string $feed_type The type of feed. rss2 | atom | rss | rdf 217 */ 218 function the_content_feed( $feed_type = null ) { 219 echo get_the_content_feed( $feed_type ); 220 } 221 222 /** 223 * Displays the post excerpt for the feed. 224 * 225 * @since 0.71 226 */ 227 function the_excerpt_rss() { 228 $output = get_the_excerpt(); 229 /** 230 * Filters the post excerpt for a feed. 231 * 232 * @since 1.2.0 233 * 234 * @param string $output The current post excerpt. 235 */ 236 echo apply_filters( 'the_excerpt_rss', $output ); 237 } 238 239 /** 240 * Displays the permalink to the post for use in feeds. 241 * 242 * @since 2.3.0 243 */ 244 function the_permalink_rss() { 245 /** 246 * Filters the permalink to the post for use in feeds. 247 * 248 * @since 2.3.0 249 * 250 * @param string $post_permalink The current post permalink. 251 */ 252 echo esc_url( apply_filters( 'the_permalink_rss', get_permalink() ) ); 253 } 254 255 /** 256 * Outputs the link to the comments for the current post in an XML safe way. 257 * 258 * @since 3.0.0 259 */ 260 function comments_link_feed() { 261 /** 262 * Filters the comments permalink for the current post. 263 * 264 * @since 3.6.0 265 * 266 * @param string $comment_permalink The current comment permalink with 267 * '#comments' appended. 268 */ 269 echo esc_url( apply_filters( 'comments_link_feed', get_comments_link() ) ); 270 } 271 272 /** 273 * Displays the feed GUID for the current comment. 274 * 275 * @since 2.5.0 276 * 277 * @param int|WP_Comment $comment_id Optional comment object or ID. Defaults to global comment object. 278 */ 279 function comment_guid( $comment_id = null ) { 280 echo esc_url( get_comment_guid( $comment_id ) ); 281 } 282 283 /** 284 * Retrieves the feed GUID for the current comment. 285 * 286 * @since 2.5.0 287 * 288 * @param int|WP_Comment $comment_id Optional comment object or ID. Defaults to global comment object. 289 * @return string|false GUID for comment on success, false on failure. 290 */ 291 function get_comment_guid( $comment_id = null ) { 292 $comment = get_comment( $comment_id ); 293 294 if ( ! is_object( $comment ) ) { 295 return false; 296 } 297 298 return get_the_guid( $comment->comment_post_ID ) . '#comment-' . $comment->comment_ID; 299 } 300 301 /** 302 * Displays the link to the comments. 303 * 304 * @since 1.5.0 305 * @since 4.4.0 Introduced the `$comment` argument. 306 * 307 * @param int|WP_Comment $comment Optional. Comment object or ID. Defaults to global comment object. 308 */ 309 function comment_link( $comment = null ) { 310 /** 311 * Filters the current comment's permalink. 312 * 313 * @since 3.6.0 314 * 315 * @see get_comment_link() 316 * 317 * @param string $comment_permalink The current comment permalink. 318 */ 319 echo esc_url( apply_filters( 'comment_link', get_comment_link( $comment ) ) ); 320 } 321 322 /** 323 * Retrieves the current comment author for use in the feeds. 324 * 325 * @since 2.0.0 326 * 327 * @return string Comment Author. 328 */ 329 function get_comment_author_rss() { 330 /** 331 * Filters the current comment author for use in a feed. 332 * 333 * @since 1.5.0 334 * 335 * @see get_comment_author() 336 * 337 * @param string $comment_author The current comment author. 338 */ 339 return apply_filters( 'comment_author_rss', get_comment_author() ); 340 } 341 342 /** 343 * Displays the current comment author in the feed. 344 * 345 * @since 1.0.0 346 */ 347 function comment_author_rss() { 348 echo get_comment_author_rss(); 349 } 350 351 /** 352 * Displays the current comment content for use in the feeds. 353 * 354 * @since 1.0.0 355 */ 356 function comment_text_rss() { 357 $comment_text = get_comment_text(); 358 /** 359 * Filters the current comment content for use in a feed. 360 * 361 * @since 1.5.0 362 * 363 * @param string $comment_text The content of the current comment. 364 */ 365 $comment_text = apply_filters( 'comment_text_rss', $comment_text ); 366 echo $comment_text; 367 } 368 369 /** 370 * Retrieves all of the post categories, formatted for use in feeds. 371 * 372 * All of the categories for the current post in the feed loop, will be 373 * retrieved and have feed markup added, so that they can easily be added to the 374 * RSS2, Atom, or RSS1 and RSS0.91 RDF feeds. 375 * 376 * @since 2.1.0 377 * 378 * @param string $type Optional, default is the type returned by get_default_feed(). 379 * @return string All of the post categories for displaying in the feed. 380 */ 381 function get_the_category_rss( $type = null ) { 382 if ( empty( $type ) ) { 383 $type = get_default_feed(); 384 } 385 $categories = get_the_category(); 386 $tags = get_the_tags(); 387 $the_list = ''; 388 $cat_names = array(); 389 390 $filter = 'rss'; 391 if ( 'atom' === $type ) { 392 $filter = 'raw'; 393 } 394 395 if ( ! empty( $categories ) ) { 396 foreach ( (array) $categories as $category ) { 397 $cat_names[] = sanitize_term_field( 'name', $category->name, $category->term_id, 'category', $filter ); 398 } 399 } 400 401 if ( ! empty( $tags ) ) { 402 foreach ( (array) $tags as $tag ) { 403 $cat_names[] = sanitize_term_field( 'name', $tag->name, $tag->term_id, 'post_tag', $filter ); 404 } 405 } 406 407 $cat_names = array_unique( $cat_names ); 408 409 foreach ( $cat_names as $cat_name ) { 410 if ( 'rdf' === $type ) { 411 $the_list .= "\t\t<dc:subject><![CDATA[$cat_name]]></dc:subject>\n"; 412 } elseif ( 'atom' === $type ) { 413 $the_list .= sprintf( '<category scheme="%1$s" term="%2$s" />', esc_attr( get_bloginfo_rss( 'url' ) ), esc_attr( $cat_name ) ); 414 } else { 415 $the_list .= "\t\t<category><![CDATA[" . html_entity_decode( $cat_name, ENT_COMPAT, get_option( 'blog_charset' ) ) . "]]></category>\n"; 416 } 417 } 418 419 /** 420 * Filters all of the post categories for display in a feed. 421 * 422 * @since 1.2.0 423 * 424 * @param string $the_list All of the RSS post categories. 425 * @param string $type Type of feed. Possible values include 'rss2', 'atom'. 426 * Default 'rss2'. 427 */ 428 return apply_filters( 'the_category_rss', $the_list, $type ); 429 } 430 431 /** 432 * Displays the post categories in the feed. 433 * 434 * @since 0.71 435 * 436 * @see get_the_category_rss() For better explanation. 437 * 438 * @param string $type Optional, default is the type returned by get_default_feed(). 439 */ 440 function the_category_rss( $type = null ) { 441 echo get_the_category_rss( $type ); 442 } 443 444 /** 445 * Displays the HTML type based on the blog setting. 446 * 447 * The two possible values are either 'xhtml' or 'html'. 448 * 449 * @since 2.2.0 450 */ 451 function html_type_rss() { 452 $type = get_bloginfo( 'html_type' ); 453 if ( str_contains( $type, 'xhtml' ) ) { 454 $type = 'xhtml'; 455 } else { 456 $type = 'html'; 457 } 458 echo $type; 459 } 460 461 /** 462 * Displays the rss enclosure for the current post. 463 * 464 * Uses the global $post to check whether the post requires a password and if 465 * the user has the password for the post. If not then it will return before 466 * displaying. 467 * 468 * Also uses the function get_post_custom() to get the post's 'enclosure' 469 * metadata field and parses the value to display the enclosure(s). The 470 * enclosure(s) consist of enclosure HTML tag(s) with a URI and other 471 * attributes. 472 * 473 * @since 1.5.0 474 */ 475 function rss_enclosure() { 476 if ( post_password_required() ) { 477 return; 478 } 479 480 foreach ( (array) get_post_custom() as $key => $val ) { 481 if ( 'enclosure' === $key ) { 482 foreach ( (array) $val as $enc ) { 483 $enclosure = explode( "\n", $enc ); 484 485 // Only get the first element, e.g. 'audio/mpeg' from 'audio/mpeg mpga mp2 mp3'. 486 $t = preg_split( '/[ \t]/', trim( $enclosure[2] ) ); 487 $type = $t[0]; 488 489 /** 490 * Filters the RSS enclosure HTML link tag for the current post. 491 * 492 * @since 2.2.0 493 * 494 * @param string $html_link_tag The HTML link tag with a URI and other attributes. 495 */ 496 echo apply_filters( 'rss_enclosure', '<enclosure url="' . esc_url( trim( $enclosure[0] ) ) . '" length="' . absint( trim( $enclosure[1] ) ) . '" type="' . esc_attr( $type ) . '" />' . "\n" ); 497 } 498 } 499 } 500 } 501 502 /** 503 * Displays the atom enclosure for the current post. 504 * 505 * Uses the global $post to check whether the post requires a password and if 506 * the user has the password for the post. If not then it will return before 507 * displaying. 508 * 509 * Also uses the function get_post_custom() to get the post's 'enclosure' 510 * metadata field and parses the value to display the enclosure(s). The 511 * enclosure(s) consist of link HTML tag(s) with a URI and other attributes. 512 * 513 * @since 2.2.0 514 */ 515 function atom_enclosure() { 516 if ( post_password_required() ) { 517 return; 518 } 519 520 foreach ( (array) get_post_custom() as $key => $val ) { 521 if ( 'enclosure' === $key ) { 522 foreach ( (array) $val as $enc ) { 523 $enclosure = explode( "\n", $enc ); 524 525 $url = ''; 526 $type = ''; 527 $length = 0; 528 529 $mimes = get_allowed_mime_types(); 530 531 // Parse URL. 532 if ( isset( $enclosure[0] ) && is_string( $enclosure[0] ) ) { 533 $url = trim( $enclosure[0] ); 534 } 535 536 // Parse length and type. 537 for ( $i = 1; $i <= 2; $i++ ) { 538 if ( isset( $enclosure[ $i ] ) ) { 539 if ( is_numeric( $enclosure[ $i ] ) ) { 540 $length = trim( $enclosure[ $i ] ); 541 } elseif ( in_array( $enclosure[ $i ], $mimes, true ) ) { 542 $type = trim( $enclosure[ $i ] ); 543 } 544 } 545 } 546 547 $html_link_tag = sprintf( 548 "<link href=\"%s\" rel=\"enclosure\" length=\"%d\" type=\"%s\" />\n", 549 esc_url( $url ), 550 esc_attr( $length ), 551 esc_attr( $type ) 552 ); 553 554 /** 555 * Filters the atom enclosure HTML link tag for the current post. 556 * 557 * @since 2.2.0 558 * 559 * @param string $html_link_tag The HTML link tag with a URI and other attributes. 560 */ 561 echo apply_filters( 'atom_enclosure', $html_link_tag ); 562 } 563 } 564 } 565 } 566 567 /** 568 * Determines the type of a string of data with the data formatted. 569 * 570 * Tell whether the type is text, HTML, or XHTML, per RFC 4287 section 3.1. 571 * 572 * In the case of WordPress, text is defined as containing no markup, 573 * XHTML is defined as "well formed", and HTML as tag soup (i.e., the rest). 574 * 575 * Container div tags are added to XHTML values, per section 3.1.1.3. 576 * 577 * @link http://www.atomenabled.org/developers/syndication/atom-format-spec.php#rfc.section.3.1 578 * 579 * @since 2.5.0 580 * 581 * @param string $data Input string. 582 * @return array array(type, value) 583 */ 584 function prep_atom_text_construct( $data ) { 585 if ( ! str_contains( $data, '<' ) && ! str_contains( $data, '&' ) ) { 586 return array( 'text', $data ); 587 } 588 589 if ( ! function_exists( 'xml_parser_create' ) ) { 590 trigger_error( __( "PHP's XML extension is not available. Please contact your hosting provider to enable PHP's XML extension." ) ); 591 592 return array( 'html', "<![CDATA[$data]]>" ); 593 } 594 595 $parser = xml_parser_create(); 596 xml_parse( $parser, '<div>' . $data . '</div>', true ); 597 $code = xml_get_error_code( $parser ); 598 xml_parser_free( $parser ); 599 unset( $parser ); 600 601 if ( ! $code ) { 602 if ( ! str_contains( $data, '<' ) ) { 603 return array( 'text', $data ); 604 } else { 605 $data = "<div xmlns='http://www.w3.org/1999/xhtml'>$data</div>"; 606 return array( 'xhtml', $data ); 607 } 608 } 609 610 if ( ! str_contains( $data, ']]>' ) ) { 611 return array( 'html', "<![CDATA[$data]]>" ); 612 } else { 613 return array( 'html', htmlspecialchars( $data ) ); 614 } 615 } 616 617 /** 618 * Displays Site Icon in atom feeds. 619 * 620 * @since 4.3.0 621 * 622 * @see get_site_icon_url() 623 */ 624 function atom_site_icon() { 625 $url = get_site_icon_url( 32 ); 626 if ( $url ) { 627 echo '<icon>' . convert_chars( $url ) . "</icon>\n"; 628 } 629 } 630 631 /** 632 * Displays Site Icon in RSS2. 633 * 634 * @since 4.3.0 635 */ 636 function rss2_site_icon() { 637 $rss_title = get_wp_title_rss(); 638 if ( empty( $rss_title ) ) { 639 $rss_title = get_bloginfo_rss( 'name' ); 640 } 641 642 $url = get_site_icon_url( 32 ); 643 if ( $url ) { 644 echo ' 645 <image> 646 <url>' . convert_chars( $url ) . '</url> 647 <title>' . $rss_title . '</title> 648 <link>' . get_bloginfo_rss( 'url' ) . '</link> 649 <width>32</width> 650 <height>32</height> 651 </image> ' . "\n"; 652 } 653 } 654 655 /** 656 * Returns the link for the currently displayed feed. 657 * 658 * @since 5.3.0 659 * 660 * @return string Correct link for the atom:self element. 661 */ 662 function get_self_link() { 663 $parsed = parse_url( home_url() ); 664 665 $domain = $parsed['host']; 666 if ( isset( $parsed['port'] ) ) { 667 $domain .= ':' . $parsed['port']; 668 } 669 670 return set_url_scheme( 'http://' . $domain . wp_unslash( $_SERVER['REQUEST_URI'] ) ); 671 } 672 673 /** 674 * Displays the link for the currently displayed feed in a XSS safe way. 675 * 676 * Generate a correct link for the atom:self element. 677 * 678 * @since 2.5.0 679 */ 680 function self_link() { 681 /** 682 * Filters the current feed URL. 683 * 684 * @since 3.6.0 685 * 686 * @see set_url_scheme() 687 * @see wp_unslash() 688 * 689 * @param string $feed_link The link for the feed with set URL scheme. 690 */ 691 echo esc_url( apply_filters( 'self_link', get_self_link() ) ); 692 } 693 694 /** 695 * Gets the UTC time of the most recently modified post from WP_Query. 696 * 697 * If viewing a comment feed, the time of the most recently modified 698 * comment will be returned. 699 * 700 * @global WP_Query $wp_query WordPress Query object. 701 * 702 * @since 5.2.0 703 * 704 * @param string $format Date format string to return the time in. 705 * @return string|false The time in requested format, or false on failure. 706 */ 707 function get_feed_build_date( $format ) { 708 global $wp_query; 709 710 $datetime = false; 711 $max_modified_time = false; 712 $utc = new DateTimeZone( 'UTC' ); 713 714 if ( ! empty( $wp_query ) && $wp_query->have_posts() ) { 715 // Extract the post modified times from the posts. 716 $modified_times = wp_list_pluck( $wp_query->posts, 'post_modified_gmt' ); 717 718 // If this is a comment feed, check those objects too. 719 if ( $wp_query->is_comment_feed() && $wp_query->comment_count ) { 720 // Extract the comment modified times from the comments. 721 $comment_times = wp_list_pluck( $wp_query->comments, 'comment_date_gmt' ); 722 723 // Add the comment times to the post times for comparison. 724 $modified_times = array_merge( $modified_times, $comment_times ); 725 } 726 727 // Determine the maximum modified time. 728 $datetime = date_create_immutable_from_format( 'Y-m-d H:i:s', max( $modified_times ), $utc ); 729 } 730 731 if ( false === $datetime ) { 732 // Fall back to last time any post was modified or published. 733 $datetime = date_create_immutable_from_format( 'Y-m-d H:i:s', get_lastpostmodified( 'GMT' ), $utc ); 734 } 735 736 if ( false !== $datetime ) { 737 $max_modified_time = $datetime->format( $format ); 738 } 739 740 /** 741 * Filters the date the last post or comment in the query was modified. 742 * 743 * @since 5.2.0 744 * 745 * @param string|false $max_modified_time Date the last post or comment was modified in the query, in UTC. 746 * False on failure. 747 * @param string $format The date format requested in get_feed_build_date(). 748 */ 749 return apply_filters( 'get_feed_build_date', $max_modified_time, $format ); 750 } 751 752 /** 753 * Returns the content type for specified feed type. 754 * 755 * @since 2.8.0 756 * 757 * @param string $type Type of feed. Possible values include 'rss', rss2', 'atom', and 'rdf'. 758 * @return string Content type for specified feed type. 759 */ 760 function feed_content_type( $type = '' ) { 761 if ( empty( $type ) ) { 762 $type = get_default_feed(); 763 } 764 765 $types = array( 766 'rss' => 'application/rss+xml', 767 'rss2' => 'application/rss+xml', 768 'rss-http' => 'text/xml', 769 'atom' => 'application/atom+xml', 770 'rdf' => 'application/rdf+xml', 771 ); 772 773 $content_type = ( ! empty( $types[ $type ] ) ) ? $types[ $type ] : 'application/octet-stream'; 774 775 /** 776 * Filters the content type for a specific feed type. 777 * 778 * @since 2.8.0 779 * 780 * @param string $content_type Content type indicating the type of data that a feed contains. 781 * @param string $type Type of feed. Possible values include 'rss', rss2', 'atom', and 'rdf'. 782 */ 783 return apply_filters( 'feed_content_type', $content_type, $type ); 784 } 785 786 /** 787 * Builds SimplePie object based on RSS or Atom feed from URL. 788 * 789 * @since 2.8.0 790 * 791 * @param string|string[] $url URL of feed to retrieve. If an array of URLs, the feeds are merged 792 * using SimplePie's multifeed feature. 793 * See also {@link http://simplepie.org/wiki/faq/typical_multifeed_gotchas} 794 * @return SimplePie|WP_Error SimplePie object on success or WP_Error object on failure. 795 */ 796 function fetch_feed( $url ) { 797 if ( ! class_exists( 'SimplePie', false ) ) { 798 require_once ABSPATH . WPINC . '/class-simplepie.php'; 799 } 800 801 require_once ABSPATH . WPINC . '/class-wp-feed-cache-transient.php'; 802 require_once ABSPATH . WPINC . '/class-wp-simplepie-file.php'; 803 require_once ABSPATH . WPINC . '/class-wp-simplepie-sanitize-kses.php'; 804 805 $feed = new SimplePie(); 806 807 $feed->set_sanitize_class( 'WP_SimplePie_Sanitize_KSES' ); 808 /* 809 * We must manually overwrite $feed->sanitize because SimplePie's constructor 810 * sets it before we have a chance to set the sanitization class. 811 */ 812 $feed->sanitize = new WP_SimplePie_Sanitize_KSES(); 813 814 // Register the cache handler using the recommended method for SimplePie 1.3 or later. 815 if ( method_exists( 'SimplePie_Cache', 'register' ) ) { 816 SimplePie_Cache::register( 'wp_transient', 'WP_Feed_Cache_Transient' ); 817 $feed->set_cache_location( 'wp_transient' ); 818 } else { 819 // Back-compat for SimplePie 1.2.x. 820 require_once ABSPATH . WPINC . '/class-wp-feed-cache.php'; 821 $feed->set_cache_class( 'WP_Feed_Cache' ); 822 } 823 824 $feed->set_file_class( 'WP_SimplePie_File' ); 825 826 $feed->set_feed_url( $url ); 827 /** This filter is documented in wp-includes/class-wp-feed-cache-transient.php */ 828 $feed->set_cache_duration( apply_filters( 'wp_feed_cache_transient_lifetime', 12 * HOUR_IN_SECONDS, $url ) ); 829 830 /** 831 * Fires just before processing the SimplePie feed object. 832 * 833 * @since 3.0.0 834 * 835 * @param SimplePie $feed SimplePie feed object (passed by reference). 836 * @param string|string[] $url URL of feed or array of URLs of feeds to retrieve. 837 */ 838 do_action_ref_array( 'wp_feed_options', array( &$feed, $url ) ); 839 840 $feed->init(); 841 $feed->set_output_encoding( get_option( 'blog_charset' ) ); 842 843 if ( $feed->error() ) { 844 return new WP_Error( 'simplepie-error', $feed->error() ); 845 } 846 847 return $feed; 848 }
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