Ticket #12575: 12575.diff

wp-includes/post.php

@@ -3718 +3718 @@
 }
 
 /**
- * Retrieve the date the the last post was published.
+ * Retrieve the date that the last post was published.
  *
  * The server timezone is the default and is the difference between GMT and
  * server time. The 'blog' value is the date when the last post was posted. The
@@ -3770 +3770 @@
  * @uses $blog_id
  * @uses apply_filters() Calls 'get_lastpostmodified' filter
  *
- * @global mixed $cache_lastpostmodified Stores the date the last post was modified
- *
  * @param string $timezone The location to get the time. Can be 'gmt', 'blog', or 'server'.
  * @return string The date the post was last modified.
  */
 function get_lastpostmodified($timezone = 'server') {
-        global $cache_lastpostmodified, $wpdb, $blog_id;
+        global $wpdb;
+
         $add_seconds_server = date('Z');
-        if ( !isset($cache_lastpostmodified[$blog_id][$timezone]) ) {
-                switch(strtolower($timezone)) {
-                        case 'gmt':
-                                $lastpostmodified = $wpdb->get_var("SELECT post_modified_gmt FROM $wpdb->posts WHERE post_status = 'publish' AND post_type = 'post' ORDER BY post_modified_gmt DESC LIMIT 1");
-                                break;
-                        case 'blog':
-                                $lastpostmodified = $wpdb->get_var("SELECT post_modified FROM $wpdb->posts WHERE post_status = 'publish' AND post_type = 'post' ORDER BY post_modified_gmt DESC LIMIT 1");
-                                break;
-                        case 'server':
-                                $lastpostmodified = $wpdb->get_var("SELECT DATE_ADD(post_modified_gmt, INTERVAL '$add_seconds_server' SECOND) FROM $wpdb->posts WHERE post_status = 'publish' AND post_type = 'post' ORDER BY post_modified_gmt DESC LIMIT 1");
-                                break;
-                }
-                $lastpostdate = get_lastpostdate($timezone);
-                if ( $lastpostdate > $lastpostmodified ) {
-                        $lastpostmodified = $lastpostdate;
-                }
-                $cache_lastpostmodified[$blog_id][$timezone] = $lastpostmodified;
-        } else {
-                $lastpostmodified = $cache_lastpostmodified[$blog_id][$timezone];
+        $timezone = strtolower( $timezone );
+
+        $lastpostmodified = wp_cache_get( "lastpostmodified:$timezone", 'timeinfo' );
+        if ( $lastpostmodified )
+                return apply_filters( 'get_lastpostmodified', $lastpostmodified, $timezone );
+        
+        switch ( strtolower($timezone) ) {
+                case 'gmt':
+                        $lastpostmodified = $wpdb->get_var("SELECT post_modified_gmt FROM $wpdb->posts WHERE post_status = 'publish' AND post_type = 'post' ORDER BY post_modified_gmt DESC LIMIT 1");
+                        break;
+                case 'blog':
+                        $lastpostmodified = $wpdb->get_var("SELECT post_modified FROM $wpdb->posts WHERE post_status = 'publish' AND post_type = 'post' ORDER BY post_modified_gmt DESC LIMIT 1");
+                        break;
+                case 'server':
+                        $lastpostmodified = $wpdb->get_var("SELECT DATE_ADD(post_modified_gmt, INTERVAL '$add_seconds_server' SECOND) FROM $wpdb->posts WHERE post_status = 'publish' AND post_type = 'post' ORDER BY post_modified_gmt DESC LIMIT 1");
+                        break;
         }
+        
+        $lastpostdate = get_lastpostdate($timezone);
+        if ( $lastpostdate > $lastpostmodified )
+                $lastpostmodified = $lastpostdate;
+
+        if ( $lastpostmodified ) 
+                wp_cache_set( "lastpostmodified:$timezone", $lastpostmodified, 'timeinfo' ); 
+
         return apply_filters( 'get_lastpostmodified', $lastpostmodified, $timezone );
 }
 
@@ -4016 +4020 @@
                 do_action('private_to_published', $post->ID);  // Deprecated, use private_to_publish
         }
 
+        // If published posts changed clear the lastpostmodified cache
+        if ( 'publish' == $new_status || 'publish' == $old_status) {
+                wp_cache_delete( 'lastpostmodified:server', 'timeinfo' );
+                wp_cache_delete( 'lastpostmodified:gmt',    'timeinfo' );
+                wp_cache_delete( 'lastpostmodified:blog',   'timeinfo' );
+        }
+
         // Always clears the hook in case the post status bounced from future to draft.
         wp_clear_scheduled_hook('publish_future_post', array( $post->ID ) );
 }