Ticket #137: 0000137-comments_feed_modtime.patch

wp-blog-header.php

@@ -115 +115 @@
 } else {
         // We're showing a feed, so WP is indeed the only thing that last changed
-        $wp_last_modified = mysql2date('D, d M Y H:i:s', get_lastpostmodified('GMT'), 0).' GMT';
+        if ($withcomments) {
+                $wp_last_modified = mysql2date('D, d M Y H:i:s', get_lastcommentmodified('GMT'), 0).' GMT';
+        } else {
+                $wp_last_modified = mysql2date('D, d M Y H:i:s', get_lastpostmodified('GMT'), 0).' GMT';
+        }
         $wp_etag = '"' . md5($wp_last_modified) . '"';
         @header('Last-Modified: '.$wp_last_modified);

wp-commentsrss2.php

@@ -1 +1 @@
 <?php 
 if (! $feed) {
+    $withcomments = 1;
     require('wp-blog-header.php');
 }

wp-includes/functions.php

@@ -142 +142 @@
 }
 
+function get_lastcommentmodified($timezone = 'server') {
+        global $tablecomments, $cache_lastcommentmodified, $pagenow, $wpdb;
+        $add_seconds_blog = get_settings('gmt_offset') * 3600;
+        $add_seconds_server = date('Z');
+        $now = current_time('mysql', 1);
+        if ( !isset($cache_lastcommentmodified[$timezone]) ) {
+                switch(strtolower($timezone)) {
+                        case 'gmt':
+                                $lastcommentmodified = $wpdb->get_var("SELECT comment_date_gmt FROM $tablecomments WHERE comment_date_gmt <= '$now' ORDER BY comment_date_gmt DESC LIMIT 1");
+                                break;
+                        case 'blog':
+                                $lastcommentmodified = $wpdb->get_var("SELECT comment_date FROM $tablecomments WHERE comment_date_gmt <= '$now' ORDER BY comment_date_gmt DESC LIMIT 1");
+                                break;
+                        case 'server':
+                                $lastcommentmodified = $wpdb->get_var("SELECT DATE_ADD(comment_date_gmt, INTERVAL '$add_seconds_server' SECOND) FROM $tablecomments WHERE comment_date_gmt <= '$now' ORDER BY comment_date_gmt DESC LIMIT 1");
+                                break;
+                }
+                $cache_lastcommentmodified[$timezone] = $lastcommentmodified;
+        } else {
+                $lastcommentmodified = $cache_lastcommentmodified[$timezone];
+        }
+        return $lastcommentmodified;
+}
+
 function user_pass_ok($user_login,$user_pass) {
         global $cache_userdata;