WordPress/wp-includes/feed-rss.php
Rachel Baker 2f263fce99 Feeds: Always return a valid timestamp for the Last-Modified header of comment or post feeds.
Fixes bug where an invalid Last-Modified value would be returned in feed requests for sites that had 0 items to return. Comment or post feeds will now return the current timestamp as the Last-Modified header value.  Example: a request for the comments feed for a site without any comments.

Replaced use of the local static variable `$cache_lastcommentmodified` to store the modified date in `get_lastcommentmodified()` with the Object Cache API.  The `get_lastcommentmodified()` function returns early if there is a cached value and returns `false` if there where no comments found. Introduced `_clear_modified_cache_on_transition_comment_status()` to flush the `lastcommentmodified` cache key when a comment enters or leaves approval status. In `get_lastpostmodified()` return early if there is a cached value and return `false` if there are no posts found.

Props swissspidy, rachelbaker, dllh, leobaiano.
Fixes #38027.
Built from https://develop.svn.wordpress.org/trunk@38925


git-svn-id: http://core.svn.wordpress.org/trunk@38868 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-10-25 20:48:29 +00:00

50 lines
1.2 KiB
PHP

<?php
/**
* RSS 0.92 Feed Template for displaying RSS 0.92 Posts feed.
*
* @package WordPress
*/
header('Content-Type: ' . feed_content_type('rss') . '; charset=' . get_option('blog_charset'), true);
$more = 1;
echo '<?xml version="1.0" encoding="'.get_option('blog_charset').'"?'.'>'; ?>
<rss version="0.92">
<channel>
<title><?php wp_title_rss(); ?></title>
<link><?php bloginfo_rss('url') ?></link>
<description><?php bloginfo_rss('description') ?></description>
<lastBuildDate><?php
$date = get_lastpostmodified( 'GMT' );
echo $date ? mysql2date( 'D, d M Y H:i:s +0000', $date ) : date( 'D, d M Y H:i:s +0000' );
?></lastBuildDate>
<docs>http://backend.userland.com/rss092</docs>
<language><?php bloginfo_rss( 'language' ); ?></language>
<?php
/**
* Fires at the end of the RSS Feed Header.
*
* @since 2.0.0
*/
do_action( 'rss_head' );
?>
<?php while (have_posts()) : the_post(); ?>
<item>
<title><?php the_title_rss() ?></title>
<description><![CDATA[<?php the_excerpt_rss() ?>]]></description>
<link><?php the_permalink_rss() ?></link>
<?php
/**
* Fires at the end of each RSS feed item.
*
* @since 2.0.0
*/
do_action( 'rss_item' );
?>
</item>
<?php endwhile; ?>
</channel>
</rss>