Changeset 38925 for trunk/src/wp-includes/feed-rdf.php

Timestamp:

10/25/2016 08:47:06 PM (8 years ago)

Author:

rachelbaker

Message:

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.

File:

• trunk/src/wp-includes/feed-rdf.php (modified) (1 diff)

trunk/src/wp-includes/feed-rdf.php

@@ -34 +34 @@
     <link><?php bloginfo_rss('url') ?></link>
     <description><?php bloginfo_rss('description') ?></description>
-    <dc:date><?php echo mysql2date('Y-m-d\TH:i:s\Z', get_lastpostmodified('GMT'), false); ?></dc:date>
+    <dc:date><?php
+        $date = get_lastpostmodified( 'GMT' );
+        echo $date ? mysql2date( 'Y-m-d\TH:i:s\Z', $date ) : date( 'Y-m-d\TH:i:s\Z' );
+    ?></dc:date>
     <sy:updatePeriod><?php
         /** This filter is documented in wp-includes/feed-rss2.php */