wp/wp-includes/feed.php
changeset 7 cf61fcea0001
parent 5 5e2f62d02dcd
child 9 177826044cd9
equal deleted inserted replaced
6:490d5cc509ed 7:cf61fcea0001
     5  * Many of the functions used in here belong in The Loop, or The Loop for the
     5  * Many of the functions used in here belong in The Loop, or The Loop for the
     6  * Feeds.
     6  * Feeds.
     7  *
     7  *
     8  * @package WordPress
     8  * @package WordPress
     9  * @subpackage Feed
     9  * @subpackage Feed
       
    10  * @since 2.1.0
    10  */
    11  */
    11 
    12 
    12 /**
    13 /**
    13  * RSS container for the bloginfo function.
    14  * RSS container for the bloginfo function.
    14  *
    15  *
    23  * @return string
    24  * @return string
    24  */
    25  */
    25 function get_bloginfo_rss($show = '') {
    26 function get_bloginfo_rss($show = '') {
    26 	$info = strip_tags(get_bloginfo($show));
    27 	$info = strip_tags(get_bloginfo($show));
    27 	/**
    28 	/**
    28 	 * Filter the bloginfo for use in RSS feeds.
    29 	 * Filters the bloginfo for use in RSS feeds.
    29 	 *
    30 	 *
    30 	 * @since 2.2.0
    31 	 * @since 2.2.0
    31 	 *
    32 	 *
    32 	 * @see convert_chars()
    33 	 * @see convert_chars()
    33 	 * @see get_bloginfo()
    34 	 * @see get_bloginfo()
    50  *
    51  *
    51  * @param string $show See get_bloginfo() for possible values.
    52  * @param string $show See get_bloginfo() for possible values.
    52  */
    53  */
    53 function bloginfo_rss($show = '') {
    54 function bloginfo_rss($show = '') {
    54 	/**
    55 	/**
    55 	 * Filter the bloginfo for display in RSS feeds.
    56 	 * Filters the bloginfo for display in RSS feeds.
    56 	 *
    57 	 *
    57 	 * @since 2.1.0
    58 	 * @since 2.1.0
    58 	 *
    59 	 *
    59 	 * @see get_bloginfo()
    60 	 * @see get_bloginfo()
    60 	 *
    61 	 *
    66 
    67 
    67 /**
    68 /**
    68  * Retrieve the default feed.
    69  * Retrieve the default feed.
    69  *
    70  *
    70  * The default feed is 'rss2', unless a plugin changes it through the
    71  * The default feed is 'rss2', unless a plugin changes it through the
    71  * 'default_feed' filter.
    72  * {@see 'default_feed'} filter.
    72  *
    73  *
    73  * @since 2.5.0
    74  * @since 2.5.0
    74  *
    75  *
    75  * @return string Default feed, or for example 'rss2', 'atom', etc.
    76  * @return string Default feed, or for example 'rss2', 'atom', etc.
    76  */
    77  */
    77 function get_default_feed() {
    78 function get_default_feed() {
    78 	/**
    79 	/**
    79 	 * Filter the default feed type.
    80 	 * Filters the default feed type.
    80 	 *
    81 	 *
    81 	 * @since 2.5.0
    82 	 * @since 2.5.0
    82 	 *
    83 	 *
    83 	 * @param string $feed_type Type of default feed. Possible values include 'rss2', 'atom'.
    84 	 * @param string $feed_type Type of default feed. Possible values include 'rss2', 'atom'.
    84 	 *                          Default 'rss2'.
    85 	 *                          Default 'rss2'.
    89 
    90 
    90 /**
    91 /**
    91  * Retrieve the blog title for the feed title.
    92  * Retrieve the blog title for the feed title.
    92  *
    93  *
    93  * @since 2.2.0
    94  * @since 2.2.0
    94  *
    95  * @since 4.4.0 The optional `$sep` parameter was deprecated and renamed to `$deprecated`.
    95  * @param string $sep Optional. How to separate the title. See wp_title() for more info.
    96  *
    96  * @return string Error message on failure or blog title on success.
    97  * @param string $deprecated Unused..
    97  */
    98  * @return string The document title.
    98 function get_wp_title_rss( $sep = '»' ) {
    99  */
    99 	$title = wp_title( $sep, false );
   100 function get_wp_title_rss( $deprecated = '–' ) {
   100 
   101 	if ( '–' !== $deprecated ) {
   101 	if ( is_wp_error( $title ) ) {
   102 		/* translators: %s: 'document_title_separator' filter name */
   102 		return $title->get_error_message();
   103 		_deprecated_argument( __FUNCTION__, '4.4.0', sprintf( __( 'Use the %s filter instead.' ), '<code>document_title_separator</code>' ) );
   103 	}
   104 	}
   104 
   105 
   105 	if ( $title && $sep && ' ' !== substr( $title, 0, 1 ) ) {
   106 	/**
   106 		$title = " $sep " . $title;
   107 	 * Filters the blog title for use as the feed title.
   107 	}
       
   108 
       
   109 	/**
       
   110 	 * Filter the blog title for use as the feed title.
       
   111 	 *
   108 	 *
   112 	 * @since 2.2.0
   109 	 * @since 2.2.0
   113 	 *
   110 	 * @since 4.4.0 The `$sep` parameter was deprecated and renamed to `$deprecated`.
   114 	 * @param string $title The current blog title.
   111 	 *
   115 	 * @param string $sep   Separator used by wp_title().
   112 	 * @param string $title      The current blog title.
   116 	 */
   113 	 * @param string $deprecated Unused.
   117 	$title = apply_filters( 'get_wp_title_rss', $title, $sep );
   114 	 */
   118 	return $title;
   115 	return apply_filters( 'get_wp_title_rss', wp_get_document_title(), $deprecated );
   119 }
   116 }
   120 
   117 
   121 /**
   118 /**
   122  * Display the blog title for display of the feed title.
   119  * Display the blog title for display of the feed title.
   123  *
   120  *
   124  * @since 2.2.0
   121  * @since 2.2.0
   125  * @see wp_title() $sep parameter usage.
   122  * @since 4.4.0 The optional `$sep` parameter was deprecated and renamed to `$deprecated`.
   126  *
   123  *
   127  * @param string $sep Optional.
   124  * @param string $deprecated Unused.
   128  */
   125  */
   129 function wp_title_rss( $sep = '&#187;' ) {
   126 function wp_title_rss( $deprecated = '&#8211;' ) {
   130 	/**
   127 	if ( '&#8211;' !== $deprecated ) {
   131 	 * Filter the blog title for display of the feed title.
   128 		/* translators: %s: 'document_title_separator' filter name */
       
   129 		_deprecated_argument( __FUNCTION__, '4.4.0', sprintf( __( 'Use the %s filter instead.' ), '<code>document_title_separator</code>' ) );
       
   130 	}
       
   131 
       
   132 	/**
       
   133 	 * Filters the blog title for display of the feed title.
   132 	 *
   134 	 *
   133 	 * @since 2.2.0
   135 	 * @since 2.2.0
       
   136 	 * @since 4.4.0 The `$sep` parameter was deprecated and renamed to `$deprecated`.
   134 	 *
   137 	 *
   135 	 * @see get_wp_title_rss()
   138 	 * @see get_wp_title_rss()
   136 	 *
   139 	 *
   137 	 * @param string $wp_title The current blog title.
   140 	 * @param string $wp_title_rss The current blog title.
   138 	 * @param string $sep      Separator used by wp_title().
   141 	 * @param string $deprecated   Unused.
   139 	 */
   142 	 */
   140 	echo apply_filters( 'wp_title_rss', get_wp_title_rss( $sep ), $sep );
   143 	echo apply_filters( 'wp_title_rss', get_wp_title_rss(), $deprecated );
   141 }
   144 }
   142 
   145 
   143 /**
   146 /**
   144  * Retrieve the current post title for the feed.
   147  * Retrieve the current post title for the feed.
   145  *
   148  *
   147  *
   150  *
   148  * @return string Current post title.
   151  * @return string Current post title.
   149  */
   152  */
   150 function get_the_title_rss() {
   153 function get_the_title_rss() {
   151 	$title = get_the_title();
   154 	$title = get_the_title();
   152 	/**
   155 
   153 	 * Filter the post title for use in a feed.
   156 	/**
       
   157 	 * Filters the post title for use in a feed.
   154 	 *
   158 	 *
   155 	 * @since 1.2.0
   159 	 * @since 1.2.0
   156 	 *
   160 	 *
   157 	 * @param string $title The current post title.
   161 	 * @param string $title The current post title.
   158 	 */
   162 	 */
   184 
   188 
   185 	/** This filter is documented in wp-includes/post-template.php */
   189 	/** This filter is documented in wp-includes/post-template.php */
   186 	$content = apply_filters( 'the_content', get_the_content() );
   190 	$content = apply_filters( 'the_content', get_the_content() );
   187 	$content = str_replace(']]>', ']]&gt;', $content);
   191 	$content = str_replace(']]>', ']]&gt;', $content);
   188 	/**
   192 	/**
   189 	 * Filter the post content for use in feeds.
   193 	 * Filters the post content for use in feeds.
   190 	 *
   194 	 *
   191 	 * @since 2.9.0
   195 	 * @since 2.9.0
   192 	 *
   196 	 *
   193 	 * @param string $content   The current post content.
   197 	 * @param string $content   The current post content.
   194 	 * @param string $feed_type Type of feed. Possible values include 'rss2', 'atom'.
   198 	 * @param string $feed_type Type of feed. Possible values include 'rss2', 'atom'.
   214  * @since 0.71
   218  * @since 0.71
   215  */
   219  */
   216 function the_excerpt_rss() {
   220 function the_excerpt_rss() {
   217 	$output = get_the_excerpt();
   221 	$output = get_the_excerpt();
   218 	/**
   222 	/**
   219 	 * Filter the post excerpt for a feed.
   223 	 * Filters the post excerpt for a feed.
   220 	 *
   224 	 *
   221 	 * @since 1.2.0
   225 	 * @since 1.2.0
   222 	 *
   226 	 *
   223 	 * @param string $output The current post excerpt.
   227 	 * @param string $output The current post excerpt.
   224 	 */
   228 	 */
   230  *
   234  *
   231  * @since 2.3.0
   235  * @since 2.3.0
   232  */
   236  */
   233 function the_permalink_rss() {
   237 function the_permalink_rss() {
   234 	/**
   238 	/**
   235 	 * Filter the permalink to the post for use in feeds.
   239 	 * Filters the permalink to the post for use in feeds.
   236 	 *
   240 	 *
   237 	 * @since 2.3.0
   241 	 * @since 2.3.0
   238 	 *
   242 	 *
   239 	 * @param string $post_permalink The current post permalink.
   243 	 * @param string $post_permalink The current post permalink.
   240 	 */
   244 	 */
   247  * @since 3.0.0
   251  * @since 3.0.0
   248  * @return none
   252  * @return none
   249  */
   253  */
   250 function comments_link_feed() {
   254 function comments_link_feed() {
   251 	/**
   255 	/**
   252 	 * Filter the comments permalink for the current post.
   256 	 * Filters the comments permalink for the current post.
   253 	 *
   257 	 *
   254 	 * @since 3.6.0
   258 	 * @since 3.6.0
   255 	 *
   259 	 *
   256 	 * @param string $comment_permalink The current comment permalink with
   260 	 * @param string $comment_permalink The current comment permalink with
   257 	 *                                  '#comments' appended.
   261 	 *                                  '#comments' appended.
   262 /**
   266 /**
   263  * Display the feed GUID for the current comment.
   267  * Display the feed GUID for the current comment.
   264  *
   268  *
   265  * @since 2.5.0
   269  * @since 2.5.0
   266  *
   270  *
   267  * @param int|object $comment_id Optional comment object or id. Defaults to global comment object.
   271  * @param int|WP_Comment $comment_id Optional comment object or id. Defaults to global comment object.
   268  */
   272  */
   269 function comment_guid($comment_id = null) {
   273 function comment_guid($comment_id = null) {
   270 	echo esc_url( get_comment_guid($comment_id) );
   274 	echo esc_url( get_comment_guid($comment_id) );
   271 }
   275 }
   272 
   276 
   273 /**
   277 /**
   274  * Retrieve the feed GUID for the current comment.
   278  * Retrieve the feed GUID for the current comment.
   275  *
   279  *
   276  * @since 2.5.0
   280  * @since 2.5.0
   277  *
   281  *
   278  * @param int|object $comment_id Optional comment object or id. Defaults to global comment object.
   282  * @param int|WP_Comment $comment_id Optional comment object or id. Defaults to global comment object.
   279  * @return false|string false on failure or guid for comment on success.
   283  * @return false|string false on failure or guid for comment on success.
   280  */
   284  */
   281 function get_comment_guid($comment_id = null) {
   285 function get_comment_guid($comment_id = null) {
   282 	$comment = get_comment($comment_id);
   286 	$comment = get_comment($comment_id);
   283 
   287 
   289 
   293 
   290 /**
   294 /**
   291  * Display the link to the comments.
   295  * Display the link to the comments.
   292  *
   296  *
   293  * @since 1.5.0
   297  * @since 1.5.0
   294  */
   298  * @since 4.4.0 Introduced the `$comment` argument.
   295 function comment_link() {
   299  *
   296 	/**
   300  * @param int|WP_Comment $comment Optional. Comment object or id. Defaults to global comment object.
   297 	 * Filter the current comment's permalink.
   301  */
       
   302 function comment_link( $comment = null ) {
       
   303 	/**
       
   304 	 * Filters the current comment's permalink.
   298 	 *
   305 	 *
   299 	 * @since 3.6.0
   306 	 * @since 3.6.0
   300 	 *
   307 	 *
   301 	 * @see get_comment_link()
   308 	 * @see get_comment_link()
   302 	 *
   309 	 *
   303 	 * @param string $comment_permalink The current comment permalink.
   310 	 * @param string $comment_permalink The current comment permalink.
   304 	 */
   311 	 */
   305 	echo esc_url( apply_filters( 'comment_link', get_comment_link() ) );
   312 	echo esc_url( apply_filters( 'comment_link', get_comment_link( $comment ) ) );
   306 }
   313 }
   307 
   314 
   308 /**
   315 /**
   309  * Retrieve the current comment author for use in the feeds.
   316  * Retrieve the current comment author for use in the feeds.
   310  *
   317  *
   312  *
   319  *
   313  * @return string Comment Author
   320  * @return string Comment Author
   314  */
   321  */
   315 function get_comment_author_rss() {
   322 function get_comment_author_rss() {
   316 	/**
   323 	/**
   317 	 * Filter the current comment author for use in a feed.
   324 	 * Filters the current comment author for use in a feed.
   318 	 *
   325 	 *
   319 	 * @since 1.5.0
   326 	 * @since 1.5.0
   320 	 *
   327 	 *
   321 	 * @see get_comment_author()
   328 	 * @see get_comment_author()
   322 	 *
   329 	 *
   340  * @since 1.0.0
   347  * @since 1.0.0
   341  */
   348  */
   342 function comment_text_rss() {
   349 function comment_text_rss() {
   343 	$comment_text = get_comment_text();
   350 	$comment_text = get_comment_text();
   344 	/**
   351 	/**
   345 	 * Filter the current comment content for use in a feed.
   352 	 * Filters the current comment content for use in a feed.
   346 	 *
   353 	 *
   347 	 * @since 1.5.0
   354 	 * @since 1.5.0
   348 	 *
   355 	 *
   349 	 * @param string $comment_text The content of the current comment.
   356 	 * @param string $comment_text The content of the current comment.
   350 	 */
   357 	 */
   394 		else
   401 		else
   395 			$the_list .= "\t\t<category><![CDATA[" . @html_entity_decode( $cat_name, ENT_COMPAT, get_option('blog_charset') ) . "]]></category>\n";
   402 			$the_list .= "\t\t<category><![CDATA[" . @html_entity_decode( $cat_name, ENT_COMPAT, get_option('blog_charset') ) . "]]></category>\n";
   396 	}
   403 	}
   397 
   404 
   398 	/**
   405 	/**
   399 	 * Filter all of the post categories for display in a feed.
   406 	 * Filters all of the post categories for display in a feed.
   400 	 *
   407 	 *
   401 	 * @since 1.2.0
   408 	 * @since 1.2.0
   402 	 *
   409 	 *
   403 	 * @param string $the_list All of the RSS post categories.
   410 	 * @param string $the_list All of the RSS post categories.
   404 	 * @param string $type     Type of feed. Possible values include 'rss2', 'atom'.
   411 	 * @param string $type     Type of feed. Possible values include 'rss2', 'atom'.
   461 				// only get the first element, e.g. audio/mpeg from 'audio/mpeg mpga mp2 mp3'
   468 				// only get the first element, e.g. audio/mpeg from 'audio/mpeg mpga mp2 mp3'
   462 				$t = preg_split('/[ \t]/', trim($enclosure[2]) );
   469 				$t = preg_split('/[ \t]/', trim($enclosure[2]) );
   463 				$type = $t[0];
   470 				$type = $t[0];
   464 
   471 
   465 				/**
   472 				/**
   466 				 * Filter the RSS enclosure HTML link tag for the current post.
   473 				 * Filters the RSS enclosure HTML link tag for the current post.
   467 				 *
   474 				 *
   468 				 * @since 2.2.0
   475 				 * @since 2.2.0
   469 				 *
   476 				 *
   470 				 * @param string $html_link_tag The HTML link tag with a URI and other attributes.
   477 				 * @param string $html_link_tag The HTML link tag with a URI and other attributes.
   471 				 */
   478 				 */
   472 				echo apply_filters( 'rss_enclosure', '<enclosure url="' . trim( htmlspecialchars( $enclosure[0] ) ) . '" length="' . trim( $enclosure[1] ) . '" type="' . $type . '" />' . "\n" );
   479 				echo apply_filters( 'rss_enclosure', '<enclosure url="' . esc_url( trim( $enclosure[0] ) ) . '" length="' . absint( trim( $enclosure[1] ) ) . '" type="' . esc_attr( $type ) . '" />' . "\n" );
   473 			}
   480 			}
   474 		}
   481 		}
   475 	}
   482 	}
   476 }
   483 }
   477 
   484 
   495 	foreach ( (array) get_post_custom() as $key => $val ) {
   502 	foreach ( (array) get_post_custom() as $key => $val ) {
   496 		if ($key == 'enclosure') {
   503 		if ($key == 'enclosure') {
   497 			foreach ( (array) $val as $enc ) {
   504 			foreach ( (array) $val as $enc ) {
   498 				$enclosure = explode("\n", $enc);
   505 				$enclosure = explode("\n", $enc);
   499 				/**
   506 				/**
   500 				 * Filter the atom enclosure HTML link tag for the current post.
   507 				 * Filters the atom enclosure HTML link tag for the current post.
   501 				 *
   508 				 *
   502 				 * @since 2.2.0
   509 				 * @since 2.2.0
   503 				 *
   510 				 *
   504 				 * @param string $html_link_tag The HTML link tag with a URI and other attributes.
   511 				 * @param string $html_link_tag The HTML link tag with a URI and other attributes.
   505 				 */
   512 				 */
   506 				echo apply_filters( 'atom_enclosure', '<link href="' . trim( htmlspecialchars( $enclosure[0] ) ) . '" rel="enclosure" length="' . trim( $enclosure[1] ) . '" type="' . trim( $enclosure[2] ) . '" />' . "\n" );
   513 				echo apply_filters( 'atom_enclosure', '<link href="' . esc_url( trim( $enclosure[0] ) ) . '" rel="enclosure" length="' . absint( trim( $enclosure[1] ) ) . '" type="' . esc_attr( trim( $enclosure[2] ) ) . '" />' . "\n" );
   507 			}
   514 			}
   508 		}
   515 		}
   509 	}
   516 	}
   510 }
   517 }
   511 
   518 
   527  * @return array array(type, value)
   534  * @return array array(type, value)
   528  */
   535  */
   529 function prep_atom_text_construct($data) {
   536 function prep_atom_text_construct($data) {
   530 	if (strpos($data, '<') === false && strpos($data, '&') === false) {
   537 	if (strpos($data, '<') === false && strpos($data, '&') === false) {
   531 		return array('text', $data);
   538 		return array('text', $data);
       
   539 	}
       
   540 
       
   541 	if ( ! function_exists( 'xml_parser_create' ) ) {
       
   542 		trigger_error( __( "PHP's XML extension is not available. Please contact your hosting provider to enable PHP's XML extension." ) );
       
   543 
       
   544 		return array( 'html', "<![CDATA[$data]]>" );
   532 	}
   545 	}
   533 
   546 
   534 	$parser = xml_parser_create();
   547 	$parser = xml_parser_create();
   535 	xml_parse($parser, '<div>' . $data . '</div>', true);
   548 	xml_parse($parser, '<div>' . $data . '</div>', true);
   536 	$code = xml_get_error_code($parser);
   549 	$code = xml_get_error_code($parser);
   543 			$data = "<div xmlns='http://www.w3.org/1999/xhtml'>$data</div>";
   556 			$data = "<div xmlns='http://www.w3.org/1999/xhtml'>$data</div>";
   544 			return array('xhtml', $data);
   557 			return array('xhtml', $data);
   545 		}
   558 		}
   546 	}
   559 	}
   547 
   560 
   548 	if (strpos($data, ']]>') == false) {
   561 	if (strpos($data, ']]>') === false) {
   549 		return array('html', "<![CDATA[$data]]>");
   562 		return array('html', "<![CDATA[$data]]>");
   550 	} else {
   563 	} else {
   551 		return array('html', htmlspecialchars($data));
   564 		return array('html', htmlspecialchars($data));
   552 	}
   565 	}
   553 }
   566 }
   554 
   567 
   555 /**
   568 /**
       
   569  * Displays Site Icon in atom feeds.
       
   570  *
       
   571  * @since 4.3.0
       
   572  *
       
   573  * @see get_site_icon_url()
       
   574  */
       
   575 function atom_site_icon() {
       
   576 	$url = get_site_icon_url( 32 );
       
   577 	if ( $url ) {
       
   578 		echo "<icon>$url</icon>\n";
       
   579 	}
       
   580 }
       
   581 
       
   582 /**
       
   583  * Displays Site Icon in RSS2.
       
   584  *
       
   585  * @since 4.3.0
       
   586  */
       
   587 function rss2_site_icon() {
       
   588 	$rss_title = get_wp_title_rss();
       
   589 	if ( empty( $rss_title ) ) {
       
   590 		$rss_title = get_bloginfo_rss( 'name' );
       
   591 	}
       
   592 
       
   593 	$url = get_site_icon_url( 32 );
       
   594 	if ( $url ) {
       
   595 		echo '
       
   596 <image>
       
   597 	<url>' . convert_chars( $url ) . '</url>
       
   598 	<title>' . $rss_title . '</title>
       
   599 	<link>' . get_bloginfo_rss( 'url' ) . '</link>
       
   600 	<width>32</width>
       
   601 	<height>32</height>
       
   602 </image> ' . "\n";
       
   603 	}
       
   604 }
       
   605 
       
   606 /**
   556  * Display the link for the currently displayed feed in a XSS safe way.
   607  * Display the link for the currently displayed feed in a XSS safe way.
   557  *
   608  *
   558  * Generate a correct link for the atom:self element.
   609  * Generate a correct link for the atom:self element.
   559  *
   610  *
   560  * @since 2.5.0
   611  * @since 2.5.0
   561  */
   612  */
   562 function self_link() {
   613 function self_link() {
   563 	$host = @parse_url(home_url());
   614 	$host = @parse_url(home_url());
   564 	/**
   615 	/**
   565 	 * Filter the current feed URL.
   616 	 * Filters the current feed URL.
   566 	 *
   617 	 *
   567 	 * @since 3.6.0
   618 	 * @since 3.6.0
   568 	 *
   619 	 *
   569 	 * @see set_url_scheme()
   620 	 * @see set_url_scheme()
   570 	 * @see wp_unslash()
   621 	 * @see wp_unslash()
   576 
   627 
   577 /**
   628 /**
   578  * Return the content type for specified feed type.
   629  * Return the content type for specified feed type.
   579  *
   630  *
   580  * @since 2.8.0
   631  * @since 2.8.0
       
   632  *
       
   633  * @param string $type Type of feed. Possible values include 'rss', rss2', 'atom', and 'rdf'.
   581  */
   634  */
   582 function feed_content_type( $type = '' ) {
   635 function feed_content_type( $type = '' ) {
   583 	if ( empty($type) )
   636 	if ( empty($type) )
   584 		$type = get_default_feed();
   637 		$type = get_default_feed();
   585 
   638 
   586 	$types = array(
   639 	$types = array(
   587 		'rss'  => 'application/rss+xml',
   640 		'rss'      => 'application/rss+xml',
   588 		'rss2' => 'application/rss+xml',
   641 		'rss2'     => 'application/rss+xml',
   589 		'rss-http'  => 'text/xml',
   642 		'rss-http' => 'text/xml',
   590 		'atom' => 'application/atom+xml',
   643 		'atom'     => 'application/atom+xml',
   591 		'rdf'  => 'application/rdf+xml'
   644 		'rdf'      => 'application/rdf+xml'
   592 	);
   645 	);
   593 
   646 
   594 	$content_type = ( !empty($types[$type]) ) ? $types[$type] : 'application/octet-stream';
   647 	$content_type = ( !empty($types[$type]) ) ? $types[$type] : 'application/octet-stream';
   595 
   648 
   596 	/**
   649 	/**
   597 	 * Filter the content type for a specific feed type.
   650 	 * Filters the content type for a specific feed type.
   598 	 *
   651 	 *
   599 	 * @since 2.8.0
   652 	 * @since 2.8.0
   600 	 *
   653 	 *
   601 	 * @param string $content_type Content type indicating the type of data that a feed contains.
   654 	 * @param string $content_type Content type indicating the type of data that a feed contains.
   602 	 * @param string $type         Type of feed. Possible values include 'rss2', 'atom'.
   655 	 * @param string $type         Type of feed. Possible values include 'rss', rss2', 'atom', and 'rdf'.
   603 	 *                             Default 'rss2'.
       
   604 	 */
   656 	 */
   605 	return apply_filters( 'feed_content_type', $content_type, $type );
   657 	return apply_filters( 'feed_content_type', $content_type, $type );
   606 }
   658 }
   607 
   659 
   608 /**
   660 /**
   615  * See also {@link ​http://simplepie.org/wiki/faq/typical_multifeed_gotchas}
   667  * See also {@link ​http://simplepie.org/wiki/faq/typical_multifeed_gotchas}
   616  *
   668  *
   617  * @return WP_Error|SimplePie WP_Error object on failure or SimplePie object on success
   669  * @return WP_Error|SimplePie WP_Error object on failure or SimplePie object on success
   618  */
   670  */
   619 function fetch_feed( $url ) {
   671 function fetch_feed( $url ) {
   620 	require_once( ABSPATH . WPINC . '/class-feed.php' );
   672 	if ( ! class_exists( 'SimplePie', false ) ) {
       
   673 		require_once( ABSPATH . WPINC . '/class-simplepie.php' );
       
   674 	}
       
   675 
       
   676 	require_once( ABSPATH . WPINC . '/class-wp-feed-cache.php' );
       
   677 	require_once( ABSPATH . WPINC . '/class-wp-feed-cache-transient.php' );
       
   678 	require_once( ABSPATH . WPINC . '/class-wp-simplepie-file.php' );
       
   679 	require_once( ABSPATH . WPINC . '/class-wp-simplepie-sanitize-kses.php' );
   621 
   680 
   622 	$feed = new SimplePie();
   681 	$feed = new SimplePie();
   623 
   682 
   624 	$feed->set_sanitize_class( 'WP_SimplePie_Sanitize_KSES' );
   683 	$feed->set_sanitize_class( 'WP_SimplePie_Sanitize_KSES' );
   625 	// We must manually overwrite $feed->sanitize because SimplePie's
   684 	// We must manually overwrite $feed->sanitize because SimplePie's
   628 
   687 
   629 	$feed->set_cache_class( 'WP_Feed_Cache' );
   688 	$feed->set_cache_class( 'WP_Feed_Cache' );
   630 	$feed->set_file_class( 'WP_SimplePie_File' );
   689 	$feed->set_file_class( 'WP_SimplePie_File' );
   631 
   690 
   632 	$feed->set_feed_url( $url );
   691 	$feed->set_feed_url( $url );
   633 	/** This filter is documented in wp-includes/class-feed.php */
   692 	/** This filter is documented in wp-includes/class-wp-feed-cache-transient.php */
   634 	$feed->set_cache_duration( apply_filters( 'wp_feed_cache_transient_lifetime', 12 * HOUR_IN_SECONDS, $url ) );
   693 	$feed->set_cache_duration( apply_filters( 'wp_feed_cache_transient_lifetime', 12 * HOUR_IN_SECONDS, $url ) );
   635 	/**
   694 	/**
   636 	 * Fires just before processing the SimplePie feed object.
   695 	 * Fires just before processing the SimplePie feed object.
   637 	 *
   696 	 *
   638 	 * @since 3.0.0
   697 	 * @since 3.0.0
   639 	 *
   698 	 *
   640 	 * @param object &$feed SimplePie feed object, passed by reference.
   699 	 * @param object $feed SimplePie feed object (passed by reference).
   641 	 * @param mixed  $url   URL of feed to retrieve. If an array of URLs, the feeds are merged.
   700 	 * @param mixed  $url  URL of feed to retrieve. If an array of URLs, the feeds are merged.
   642 	 */
   701 	 */
   643 	do_action_ref_array( 'wp_feed_options', array( &$feed, $url ) );
   702 	do_action_ref_array( 'wp_feed_options', array( &$feed, $url ) );
   644 	$feed->init();
   703 	$feed->init();
   645 	$feed->handle_content_type();
   704 	$feed->set_output_encoding( get_option( 'blog_charset' ) );
   646 
   705 
   647 	if ( $feed->error() )
   706 	if ( $feed->error() )
   648 		return new WP_Error( 'simplepie-error', $feed->error() );
   707 		return new WP_Error( 'simplepie-error', $feed->error() );
   649 
   708 
   650 	return $feed;
   709 	return $feed;