WebKitSite/blog/wp-includes/feed.php - WebKit - Git at Google

 <?php
 /**
  * WordPress Feed API
  *
  * Many of the functions used in here belong in The Loop, or The Loop for the
  * Feeds.
  *
  * @package WordPress
  * @subpackage Feed
  */

 /**
  * RSS container for the bloginfo function.
  *
  * You can retrieve anything that you can using the get_bloginfo() function.
  * Everything will be stripped of tags and characters converted, when the values
  * are retrieved for use in the feeds.
  *
  * @package WordPress
  * @subpackage Feed
  * @since 1.5.1
  * @uses apply_filters() Calls 'get_bloginfo_rss' hook with two parameters.
  * @see get_bloginfo() For the list of possible values to display.
  *
  * @param string $show See get_bloginfo() for possible values.
  * @return string
  */
 function get_bloginfo_rss($show = '') {
 	$info = strip_tags(get_bloginfo($show));
 	return apply_filters('get_bloginfo_rss', convert_chars($info), $show);
 }

 /**
  * Display RSS container for the bloginfo function.
  *
  * You can retrieve anything that you can using the get_bloginfo() function.
  * Everything will be stripped of tags and characters converted, when the values
  * are retrieved for use in the feeds.
  *
  * @package WordPress
  * @subpackage Feed
  * @since 0.71
  * @uses apply_filters() Calls 'bloginfo_rss' hook with two parameters.
  * @see get_bloginfo() For the list of possible values to display.
  *
  * @param string $show See get_bloginfo() for possible values.
  */
 function bloginfo_rss($show = '') {
 	echo apply_filters('bloginfo_rss', get_bloginfo_rss($show), $show);
 }

 /**
  * Retrieve the default feed.
  *
  * The default feed is 'rss2', unless a plugin changes it through the
  * 'default_feed' filter.
  *
  * @package WordPress
  * @subpackage Feed
  * @since 2.5
  * @uses apply_filters() Calls 'default_feed' hook on the default feed string.
  *
  * @return string Default feed, or for example 'rss2', 'atom', etc.
  */
 function get_default_feed() {
 	return apply_filters('default_feed', 'rss2');
 }

 /**
  * Retrieve the blog title for the feed title.
  *
  * @package WordPress
  * @subpackage Feed
  * @since 2.2.0
  * @uses apply_filters() Calls 'get_wp_title_rss' hook on title.
  * @uses wp_title() See function for $sep parameter usage.
  *
  * @param string $sep Optional.How to separate the title. See wp_title() for more info.
  * @return string Error message on failure or blog title on success.
  */
 function get_wp_title_rss($sep = '&#187;') {
 	$title = wp_title($sep, false);
 	if ( is_wp_error( $title ) )
 		return $title->get_error_message();
 	$title = apply_filters('get_wp_title_rss', $title);
 	return $title;
 }

 /**
  * Display the blog title for display of the feed title.
  *
  * @package WordPress
  * @subpackage Feed
  * @since 2.2.0
  * @uses apply_filters() Calls 'wp_title_rss' on the blog title.
  * @see wp_title() $sep parameter usage.
  *
  * @param string $sep Optional.
  */
 function wp_title_rss($sep = '&#187;') {
 	echo apply_filters('wp_title_rss', get_wp_title_rss($sep));
 }

 /**
  * Retrieve the current post title for the feed.
  *
  * @package WordPress
  * @subpackage Feed
  * @since 2.0.0
  * @uses apply_filters() Calls 'the_title_rss' on the post title.
  *
  * @return string Current post title.
  */
 function get_the_title_rss() {
 	$title = get_the_title();
 	$title = apply_filters('the_title_rss', $title);
 	return $title;
 }

 /**
  * Display the post title in the feed.
  *
  * @package WordPress
  * @subpackage Feed
  * @since 0.71
  * @uses get_the_title_rss() Used to retrieve current post title.
  */
 function the_title_rss() {
 	echo get_the_title_rss();
 }

 /**
  * Display the post content for the feed.
  *
  * For encoding the html or the $encode_html parameter, there are three possible
  * values. '0' will make urls footnotes and use make_url_footnote(). '1' will
  * encode special characters and automatically display all of the content. The
  * value of '2' will strip all HTML tags from the content.
  *
  * Also note that you cannot set the amount of words and not set the html
  * encoding. If that is the case, then the html encoding will default to 2,
  * which will strip all HTML tags.
  *
  * To restrict the amount of words of the content, you can use the cut
  * parameter. If the content is less than the amount, then there won't be any
  * dots added to the end. If there is content left over, then dots will be added
  * and the rest of the content will be removed.
  *
  * @package WordPress
  * @subpackage Feed
  * @since 0.71
  * @uses apply_filters() Calls 'the_content_rss' on the content before processing.
  * @see get_the_content() For the $more_link_text, $stripteaser, and $more_file
  *		parameters.
  *
  * @param string $more_link_text Optional. Text to display when more content is available but not displayed.
  * @param int|bool $stripteaser Optional. Default is 0.
  * @param string $more_file Optional.
  * @param int $cut Optional. Amount of words to keep for the content.
  * @param int $encode_html Optional. How to encode the content.
  */
 function the_content_rss($more_link_text='(more...)', $stripteaser=0, $more_file='', $cut = 0, $encode_html = 0) {
 	$content = get_the_content($more_link_text, $stripteaser, $more_file);
 	$content = apply_filters('the_content_rss', $content);
 	if ( $cut && !$encode_html )
 		$encode_html = 2;
 	if ( 1== $encode_html ) {
 		$content = wp_specialchars($content);
 		$cut = 0;
 	} elseif ( 0 == $encode_html ) {
 		$content = make_url_footnote($content);
 	} elseif ( 2 == $encode_html ) {
 		$content = strip_tags($content);
 	}
 	if ( $cut ) {
 		$blah = explode(' ', $content);
 		if ( count($blah) > $cut ) {
 			$k = $cut;
 			$use_dotdotdot = 1;
 		} else {
 			$k = count($blah);
 			$use_dotdotdot = 0;
 		}

 		/** @todo Check performance, might be faster to use array slice instead. */
 		for ( $i=0; $i<$k; $i++ )
 			$excerpt .= $blah[$i].' ';
 		$excerpt .= ($use_dotdotdot) ? '...' : '';
 		$content = $excerpt;
 	}
 	$content = str_replace(']]>', ']]&gt;', $content);
 	echo $content;
 }

 /**
  * Display the post excerpt for the feed.
  *
  * @package WordPress
  * @subpackage Feed
  * @since 0.71
  * @uses apply_filters() Calls 'the_excerpt_rss' hook on the excerpt.
  */
 function the_excerpt_rss() {
 	$output = get_the_excerpt();
 	echo apply_filters('the_excerpt_rss', $output);
 }

 /**
  * Display the permalink to the post for use in feeds.
  *
  * @package WordPress
  * @subpackage Feed
  * @since 2.3.0
  * @uses apply_filters() Call 'the_permalink_rss' on the post permalink
  */
 function the_permalink_rss() {
 	echo apply_filters('the_permalink_rss', get_permalink());
 }

 /**
  * Display the feed GUID for the current comment.
  *
  * @package WordPress
  * @subpackage Feed
  * @since unknown
  */
 function comment_guid() {
 	echo get_comment_guid();
 }

 /**
  * Retrieve the feed GUID for the current comment.
  *
  * @package WordPress
  * @subpackage Feed
  * @since unknown
  *
  * @return bool|string false on failure or guid for comment on success.
  */
 function get_comment_guid() {
 	global $comment;

 	if ( !is_object($comment) )
 		return false;

 	return get_the_guid($comment->comment_post_ID) . '#comment-' . $comment->comment_ID;
 }

 /**
  * Display the link to the comments.
  *
  * @since 1.5.0
  */
 function comment_link() {
 	echo get_comment_link();
 }

 /**
  * Retrieve the current comment author for use in the feeds.
  *
  * @package WordPress
  * @subpackage Feed
  * @since 2.0.0
  * @uses apply_filters() Calls 'comment_author_rss' hook on comment author.
  * @uses get_comment_author()
  *
  * @return string Comment Author
  */
 function get_comment_author_rss() {
 	return apply_filters('comment_author_rss', get_comment_author() );
 }

 /**
  * Display the current comment author in the feed.
  *
  * @package WordPress
  * @subpackage Feed
  * @since 1.0.0
  */
 function comment_author_rss() {
 	echo get_comment_author_rss();
 }

 /**
  * Display the current comment content for use in the feeds.
  *
  * @package WordPress
  * @subpackage Feed
  * @since 1.0.0
  * @uses apply_filters() Calls 'comment_text_rss' filter on comment content.
  * @uses get_comment_text()
  */
 function comment_text_rss() {
 	$comment_text = get_comment_text();
 	$comment_text = apply_filters('comment_text_rss', $comment_text);
 	echo $comment_text;
 }

 /**
  * Retrieve all of the post categories, formatted for use in feeds.
  *
  * All of the categories for the current post in the feed loop, will be
  * retrieved and have feed markup added, so that they can easily be added to the
  * RSS2, Atom, or RSS1 and RSS0.91 RDF feeds.
  *
  * @package WordPress
  * @subpackage Feed
  * @since 2.1.0
  * @uses apply_filters()
  *
  * @param string $type Optional, default is 'rss'. Either 'rss', 'atom', or 'rdf'.
  * @return string All of the post categories for displaying in the feed.
  */
 function get_the_category_rss($type = 'rss') {
 	$categories = get_the_category();
 	$tags = get_the_tags();
 	$the_list = '';
 	$cat_names = array();

 	$filter = 'rss';
 	if ( 'atom' == $type )
 		$filter = 'raw';

 	if ( !empty($categories) ) foreach ( (array) $categories as $category ) {
 		$cat_names[] = sanitize_term_field('name', $category->name, $category->term_id, 'category', $filter);
 	}

 	if ( !empty($tags) ) foreach ( (array) $tags as $tag ) {
 		$cat_names[] = sanitize_term_field('name', $tag->name, $tag->term_id, 'post_tag', $filter);
 	}

 	$cat_names = array_unique($cat_names);

 	foreach ( $cat_names as $cat_name ) {
 		if ( 'rdf' == $type )
 			$the_list .= "\n\t\t<dc:subject><![CDATA[$cat_name]]></dc:subject>\n";
 		elseif ( 'atom' == $type )
 			$the_list .= sprintf( '<category scheme="%1$s" term="%2$s" />', attribute_escape( apply_filters( 'get_bloginfo_rss', get_bloginfo( 'url' ) ) ), attribute_escape( $cat_name ) );
 		else
 			$the_list .= "\n\t\t<category><![CDATA[$cat_name]]></category>\n";
 	}

 	return apply_filters('the_category_rss', $the_list, $type);
 }

 /**
  * Display the post categories in the feed.
  *
  * @package WordPress
  * @subpackage Feed
  * @since 0.71
  * @see get_the_category_rss() For better explanation.
  *
  * @param string $type Optional, default is 'rss'. Either 'rss', 'atom', or 'rdf'.
  */
 function the_category_rss($type = 'rss') {
 	echo get_the_category_rss($type);
 }

 /**
  * Display the HTML type based on the blog setting.
  *
  * The two possible values are either 'xhtml' or 'html'.
  *
  * @package WordPress
  * @subpackage Feed
  * @since 2.2.0
  */
 function html_type_rss() {
 	$type = get_bloginfo('html_type');
 	if (strpos($type, 'xhtml') !== false)
 		$type = 'xhtml';
 	else
 		$type = 'html';
 	echo $type;
 }

 /**
  * Display the rss enclosure for the current post.
  *
  * Uses the global $post to check whether the post requires a password and if
  * the user has the password for the post. If not then it will return before
  * displaying.
  *
  * Also uses the function get_post_custom() to get the post's 'enclosure'
  * metadata field and parses the value to display the enclosure(s). The
  * enclosure(s) consist of enclosure HTML tag(s) with a URI and other
  * attributes.
  *
  * @package WordPress
  * @subpackage Template
  * @since 1.5.0
  * @uses apply_filters() Calls 'rss_enclosure' hook on rss enclosure.
  * @uses get_post_custom() To get the current post enclosure metadata.
  */
 function rss_enclosure() {
 	global $post;
 	if ( !empty($post->post_password) && (!isset($_COOKIE['wp-postpass_'.COOKIEHASH]) || $_COOKIE['wp-postpass_'.COOKIEHASH] != $post->post_password) )
 		return;

 	foreach (get_post_custom() as $key => $val) {
 		if ($key == 'enclosure') {
 			foreach ((array)$val as $enc) {
 				$enclosure = split("\n", $enc);
 				echo apply_filters('rss_enclosure', '<enclosure url="' . trim(htmlspecialchars($enclosure[0])) . '" length="' . trim($enclosure[1]) . '" type="' . trim($enclosure[2]) . '" />' . "\n");
 			}
 		}
 	}
 }

 /**
  * Display the atom enclosure for the current post.
  *
  * Uses the global $post to check whether the post requires a password and if
  * the user has the password for the post. If not then it will return before
  * displaying.
  *
  * Also uses the function get_post_custom() to get the post's 'enclosure'
  * metadata field and parses the value to display the enclosure(s). The
  * enclosure(s) consist of link HTML tag(s) with a URI and other attributes.
  *
  * @package WordPress
  * @subpackage Template
  * @since 2.2.0
  * @uses apply_filters() Calls 'atom_enclosure' hook on atom enclosure.
  * @uses get_post_custom() To get the current post enclosure metadata.
  */
 function atom_enclosure() {
 	global $post;
 	if ( !empty($post->post_password) && ($_COOKIE['wp-postpass_'.COOKIEHASH] != $post->post_password) )
 		return;

 	foreach (get_post_custom() as $key => $val) {
 		if ($key == 'enclosure') {
 			foreach ((array)$val as $enc) {
 				$enclosure = split("\n", $enc);
 				echo apply_filters('atom_enclosure', '<link href="' . trim(htmlspecialchars($enclosure[0])) . '" rel="enclosure" length="' . trim($enclosure[1]) . '" type="' . trim($enclosure[2]) . '" />' . "\n");
 			}
 		}
 	}
 }

 /**
  * Determine the type of a string of data with the data formatted.
  *
  * Tell whether the type is text, html, or xhtml, per RFC 4287 section 3.1.
  *
  * In the case of WordPress, text is defined as containing no markup,
  * xhtml is defined as "well formed", and html as tag soup (i.e., the rest).
  *
  * Container div tags are added to xhtml values, per section 3.1.1.3.
  *
  * @link http://www.atomenabled.org/developers/syndication/atom-format-spec.php#rfc.section.3.1
  *
  * @package WordPress
  * @subpackage Feed
  * @since 2.5
  *
  * @param string $data Input string
  * @return array array(type, value)
  */
 function prep_atom_text_construct($data) {
 	if (strpos($data, '<') === false && strpos($data, '&') === false) {
 		return array('text', $data);
 	}

 	$parser = xml_parser_create();
 	xml_parse($parser, '<div>' . $data . '</div>', true);
 	$code = xml_get_error_code($parser);
 	xml_parser_free($parser);

 	if (!$code) {
 		if (strpos($data, '<') === false) {
 			return array('text', $data);
 		} else {
 			$data = "<div xmlns='http://www.w3.org/1999/xhtml'>$data</div>";
 			return array('xhtml', $data);
 		}
 	}

 	if (strpos($data, ']]>') == false) {
 		return array('html', "<![CDATA[$data]]>");
 	} else {
 		return array('html', htmlspecialchars($data));
 	}
 }

 /**
  * Display the link for the currently displayed feed in a XSS safe way.
  *
  * Generate a correct link for the atom:self element.
  *
  * @package WordPress
  * @subpackage Feed
  * @since 2.5
  */
 function self_link() {
 	echo 'http'
 		. ( $_SERVER['https'] == 'on' ? 's' : '' ) . '://'
 		. $_SERVER['HTTP_HOST']
 		. wp_specialchars(stripslashes($_SERVER['REQUEST_URI']), 1);
 }

 ?>
	<?php
	/**
	* WordPress Feed API
	*
	* Many of the functions used in here belong in The Loop, or The Loop for the
	* Feeds.
	*
	* @package WordPress
	* @subpackage Feed
	*/

	/**
	* RSS container for the bloginfo function.
	*
	* You can retrieve anything that you can using the get_bloginfo() function.
	* Everything will be stripped of tags and characters converted, when the values
	* are retrieved for use in the feeds.
	*
	* @package WordPress
	* @subpackage Feed
	* @since 1.5.1
	* @uses apply_filters() Calls 'get_bloginfo_rss' hook with two parameters.
	* @see get_bloginfo() For the list of possible values to display.
	*
	* @param string $show See get_bloginfo() for possible values.
	* @return string
	*/
	function get_bloginfo_rss($show = '') {
	$info = strip_tags(get_bloginfo($show));
	return apply_filters('get_bloginfo_rss', convert_chars($info), $show);
	}

	/**
	* Display RSS container for the bloginfo function.
	*
	* You can retrieve anything that you can using the get_bloginfo() function.
	* Everything will be stripped of tags and characters converted, when the values
	* are retrieved for use in the feeds.
	*
	* @package WordPress
	* @subpackage Feed
	* @since 0.71
	* @uses apply_filters() Calls 'bloginfo_rss' hook with two parameters.
	* @see get_bloginfo() For the list of possible values to display.
	*
	* @param string $show See get_bloginfo() for possible values.
	*/
	function bloginfo_rss($show = '') {
	echo apply_filters('bloginfo_rss', get_bloginfo_rss($show), $show);
	}

	/**
	* Retrieve the default feed.
	*
	* The default feed is 'rss2', unless a plugin changes it through the
	* 'default_feed' filter.
	*
	* @package WordPress
	* @subpackage Feed
	* @since 2.5
	* @uses apply_filters() Calls 'default_feed' hook on the default feed string.
	*
	* @return string Default feed, or for example 'rss2', 'atom', etc.
	*/
	function get_default_feed() {
	return apply_filters('default_feed', 'rss2');
	}

	/**
	* Retrieve the blog title for the feed title.
	*
	* @package WordPress
	* @subpackage Feed
	* @since 2.2.0
	* @uses apply_filters() Calls 'get_wp_title_rss' hook on title.
	* @uses wp_title() See function for $sep parameter usage.
	*
	* @param string $sep Optional.How to separate the title. See wp_title() for more info.
	* @return string Error message on failure or blog title on success.
	*/
	function get_wp_title_rss($sep = '»') {
	$title = wp_title($sep, false);
	if ( is_wp_error( $title ) )
	return $title->get_error_message();
	$title = apply_filters('get_wp_title_rss', $title);
	return $title;
	}

	/**
	* Display the blog title for display of the feed title.
	*
	* @package WordPress
	* @subpackage Feed
	* @since 2.2.0
	* @uses apply_filters() Calls 'wp_title_rss' on the blog title.
	* @see wp_title() $sep parameter usage.
	*
	* @param string $sep Optional.
	*/
	function wp_title_rss($sep = '»') {
	echo apply_filters('wp_title_rss', get_wp_title_rss($sep));
	}

	/**
	* Retrieve the current post title for the feed.
	*
	* @package WordPress
	* @subpackage Feed
	* @since 2.0.0
	* @uses apply_filters() Calls 'the_title_rss' on the post title.
	*
	* @return string Current post title.
	*/
	function get_the_title_rss() {
	$title = get_the_title();
	$title = apply_filters('the_title_rss', $title);
	return $title;
	}

	/**
	* Display the post title in the feed.
	*
	* @package WordPress
	* @subpackage Feed
	* @since 0.71
	* @uses get_the_title_rss() Used to retrieve current post title.
	*/
	function the_title_rss() {
	echo get_the_title_rss();
	}

	/**
	* Display the post content for the feed.
	*
	* For encoding the html or the $encode_html parameter, there are three possible
	* values. '0' will make urls footnotes and use make_url_footnote(). '1' will
	* encode special characters and automatically display all of the content. The
	* value of '2' will strip all HTML tags from the content.
	*
	* Also note that you cannot set the amount of words and not set the html
	* encoding. If that is the case, then the html encoding will default to 2,
	* which will strip all HTML tags.
	*
	* To restrict the amount of words of the content, you can use the cut
	* parameter. If the content is less than the amount, then there won't be any
	* dots added to the end. If there is content left over, then dots will be added
	* and the rest of the content will be removed.
	*
	* @package WordPress
	* @subpackage Feed
	* @since 0.71
	* @uses apply_filters() Calls 'the_content_rss' on the content before processing.
	* @see get_the_content() For the $more_link_text, $stripteaser, and $more_file
	* parameters.
	*
	* @param string $more_link_text Optional. Text to display when more content is available but not displayed.
	* @param int\|bool $stripteaser Optional. Default is 0.
	* @param string $more_file Optional.
	* @param int $cut Optional. Amount of words to keep for the content.
	* @param int $encode_html Optional. How to encode the content.
	*/
	function the_content_rss($more_link_text='(more...)', $stripteaser=0, $more_file='', $cut = 0, $encode_html = 0) {
	$content = get_the_content($more_link_text, $stripteaser, $more_file);
	$content = apply_filters('the_content_rss', $content);
	if ( $cut && !$encode_html )
	$encode_html = 2;
	if ( 1== $encode_html ) {
	$content = wp_specialchars($content);
	$cut = 0;
	} elseif ( 0 == $encode_html ) {
	$content = make_url_footnote($content);
	} elseif ( 2 == $encode_html ) {
	$content = strip_tags($content);
	}
	if ( $cut ) {
	$blah = explode(' ', $content);
	if ( count($blah) > $cut ) {
	$k = $cut;
	$use_dotdotdot = 1;
	} else {
	$k = count($blah);
	$use_dotdotdot = 0;
	}

	/** @todo Check performance, might be faster to use array slice instead. */
	for ( $i=0; $i<$k; $i++ )
	$excerpt .= $blah[$i].' ';
	$excerpt .= ($use_dotdotdot) ? '...' : '';
	$content = $excerpt;
	}
	$content = str_replace(']]>', ']]>', $content);
	echo $content;
	}

	/**
	* Display the post excerpt for the feed.
	*
	* @package WordPress
	* @subpackage Feed
	* @since 0.71
	* @uses apply_filters() Calls 'the_excerpt_rss' hook on the excerpt.
	*/
	function the_excerpt_rss() {
	$output = get_the_excerpt();
	echo apply_filters('the_excerpt_rss', $output);
	}

	/**
	* Display the permalink to the post for use in feeds.
	*
	* @package WordPress
	* @subpackage Feed
	* @since 2.3.0
	* @uses apply_filters() Call 'the_permalink_rss' on the post permalink
	*/
	function the_permalink_rss() {
	echo apply_filters('the_permalink_rss', get_permalink());
	}

	/**
	* Display the feed GUID for the current comment.
	*
	* @package WordPress
	* @subpackage Feed
	* @since unknown
	*/
	function comment_guid() {
	echo get_comment_guid();
	}

	/**
	* Retrieve the feed GUID for the current comment.
	*
	* @package WordPress
	* @subpackage Feed
	* @since unknown
	*
	* @return bool\|string false on failure or guid for comment on success.
	*/
	function get_comment_guid() {
	global $comment;

	if ( !is_object($comment) )
	return false;

	return get_the_guid($comment->comment_post_ID) . '#comment-' . $comment->comment_ID;
	}

	/**
	* Display the link to the comments.
	*
	* @since 1.5.0
	*/
	function comment_link() {
	echo get_comment_link();
	}

	/**
	* Retrieve the current comment author for use in the feeds.
	*
	* @package WordPress
	* @subpackage Feed
	* @since 2.0.0
	* @uses apply_filters() Calls 'comment_author_rss' hook on comment author.
	* @uses get_comment_author()
	*
	* @return string Comment Author
	*/
	function get_comment_author_rss() {
	return apply_filters('comment_author_rss', get_comment_author() );
	}

	/**
	* Display the current comment author in the feed.
	*
	* @package WordPress
	* @subpackage Feed
	* @since 1.0.0
	*/
	function comment_author_rss() {
	echo get_comment_author_rss();
	}

	/**
	* Display the current comment content for use in the feeds.
	*
	* @package WordPress
	* @subpackage Feed
	* @since 1.0.0
	* @uses apply_filters() Calls 'comment_text_rss' filter on comment content.
	* @uses get_comment_text()
	*/
	function comment_text_rss() {
	$comment_text = get_comment_text();
	$comment_text = apply_filters('comment_text_rss', $comment_text);
	echo $comment_text;
	}

	/**
	* Retrieve all of the post categories, formatted for use in feeds.
	*
	* All of the categories for the current post in the feed loop, will be
	* retrieved and have feed markup added, so that they can easily be added to the
	* RSS2, Atom, or RSS1 and RSS0.91 RDF feeds.
	*
	* @package WordPress
	* @subpackage Feed
	* @since 2.1.0
	* @uses apply_filters()
	*
	* @param string $type Optional, default is 'rss'. Either 'rss', 'atom', or 'rdf'.
	* @return string All of the post categories for displaying in the feed.
	*/
	function get_the_category_rss($type = 'rss') {
	$categories = get_the_category();
	$tags = get_the_tags();
	$the_list = '';
	$cat_names = array();

	$filter = 'rss';
	if ( 'atom' == $type )
	$filter = 'raw';

	if ( !empty($categories) ) foreach ( (array) $categories as $category ) {
	$cat_names[] = sanitize_term_field('name', $category->name, $category->term_id, 'category', $filter);
	}

	if ( !empty($tags) ) foreach ( (array) $tags as $tag ) {
	$cat_names[] = sanitize_term_field('name', $tag->name, $tag->term_id, 'post_tag', $filter);
	}

	$cat_names = array_unique($cat_names);

	foreach ( $cat_names as $cat_name ) {
	if ( 'rdf' == $type )
	$the_list .= "\n\t\t<dc:subject><![CDATA[$cat_name]]></dc:subject>\n";
	elseif ( 'atom' == $type )
	$the_list .= sprintf( '<category scheme="%1$s" term="%2$s" />', attribute_escape( apply_filters( 'get_bloginfo_rss', get_bloginfo( 'url' ) ) ), attribute_escape( $cat_name ) );
	else
	$the_list .= "\n\t\t<category><![CDATA[$cat_name]]></category>\n";
	}

	return apply_filters('the_category_rss', $the_list, $type);
	}

	/**
	* Display the post categories in the feed.
	*
	* @package WordPress
	* @subpackage Feed
	* @since 0.71
	* @see get_the_category_rss() For better explanation.
	*
	* @param string $type Optional, default is 'rss'. Either 'rss', 'atom', or 'rdf'.
	*/
	function the_category_rss($type = 'rss') {
	echo get_the_category_rss($type);
	}

	/**
	* Display the HTML type based on the blog setting.
	*
	* The two possible values are either 'xhtml' or 'html'.
	*
	* @package WordPress
	* @subpackage Feed
	* @since 2.2.0
	*/
	function html_type_rss() {
	$type = get_bloginfo('html_type');
	if (strpos($type, 'xhtml') !== false)
	$type = 'xhtml';
	else
	$type = 'html';
	echo $type;
	}

	/**
	* Display the rss enclosure for the current post.
	*
	* Uses the global $post to check whether the post requires a password and if
	* the user has the password for the post. If not then it will return before
	* displaying.
	*
	* Also uses the function get_post_custom() to get the post's 'enclosure'
	* metadata field and parses the value to display the enclosure(s). The
	* enclosure(s) consist of enclosure HTML tag(s) with a URI and other
	* attributes.
	*
	* @package WordPress
	* @subpackage Template
	* @since 1.5.0
	* @uses apply_filters() Calls 'rss_enclosure' hook on rss enclosure.
	* @uses get_post_custom() To get the current post enclosure metadata.
	*/
	function rss_enclosure() {
	global $post;
	if ( !empty($post->post_password) && (!isset($_COOKIE['wp-postpass_'.COOKIEHASH]) \|\| $_COOKIE['wp-postpass_'.COOKIEHASH] != $post->post_password) )
	return;

	foreach (get_post_custom() as $key => $val) {
	if ($key == 'enclosure') {
	foreach ((array)$val as $enc) {
	$enclosure = split("\n", $enc);
	echo apply_filters('rss_enclosure', '<enclosure url="' . trim(htmlspecialchars($enclosure[0])) . '" length="' . trim($enclosure[1]) . '" type="' . trim($enclosure[2]) . '" />' . "\n");
	}
	}
	}
	}

	/**
	* Display the atom enclosure for the current post.
	*
	* Uses the global $post to check whether the post requires a password and if
	* the user has the password for the post. If not then it will return before
	* displaying.
	*
	* Also uses the function get_post_custom() to get the post's 'enclosure'
	* metadata field and parses the value to display the enclosure(s). The
	* enclosure(s) consist of link HTML tag(s) with a URI and other attributes.
	*
	* @package WordPress
	* @subpackage Template
	* @since 2.2.0
	* @uses apply_filters() Calls 'atom_enclosure' hook on atom enclosure.
	* @uses get_post_custom() To get the current post enclosure metadata.
	*/
	function atom_enclosure() {
	global $post;
	if ( !empty($post->post_password) && ($_COOKIE['wp-postpass_'.COOKIEHASH] != $post->post_password) )
	return;

	foreach (get_post_custom() as $key => $val) {
	if ($key == 'enclosure') {
	foreach ((array)$val as $enc) {
	$enclosure = split("\n", $enc);
	echo apply_filters('atom_enclosure', '<link href="' . trim(htmlspecialchars($enclosure[0])) . '" rel="enclosure" length="' . trim($enclosure[1]) . '" type="' . trim($enclosure[2]) . '" />' . "\n");
	}
	}
	}
	}

	/**
	* Determine the type of a string of data with the data formatted.
	*
	* Tell whether the type is text, html, or xhtml, per RFC 4287 section 3.1.
	*
	* In the case of WordPress, text is defined as containing no markup,
	* xhtml is defined as "well formed", and html as tag soup (i.e., the rest).
	*
	* Container div tags are added to xhtml values, per section 3.1.1.3.
	*
	* @link http://www.atomenabled.org/developers/syndication/atom-format-spec.php#rfc.section.3.1
	*
	* @package WordPress
	* @subpackage Feed
	* @since 2.5
	*
	* @param string $data Input string
	* @return array array(type, value)
	*/
	function prep_atom_text_construct($data) {
	if (strpos($data, '<') === false && strpos($data, '&') === false) {
	return array('text', $data);
	}

	$parser = xml_parser_create();
	xml_parse($parser, '<div>' . $data . '</div>', true);
	$code = xml_get_error_code($parser);
	xml_parser_free($parser);

	if (!$code) {
	if (strpos($data, '<') === false) {
	return array('text', $data);
	} else {
	$data = "<div xmlns='http://www.w3.org/1999/xhtml'>$data</div>";
	return array('xhtml', $data);
	}
	}

	if (strpos($data, ']]>') == false) {
	return array('html', "<![CDATA[$data]]>");
	} else {
	return array('html', htmlspecialchars($data));
	}
	}

	/**
	* Display the link for the currently displayed feed in a XSS safe way.
	*
	* Generate a correct link for the atom:self element.
	*
	* @package WordPress
	* @subpackage Feed
	* @since 2.5
	*/
	function self_link() {
	echo 'http'
	. ( $_SERVER['https'] == 'on' ? 's' : '' ) . '://'
	. $_SERVER['HTTP_HOST']
	. wp_specialchars(stripslashes($_SERVER['REQUEST_URI']), 1);
	}

	?>