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