Ticket #4178: delete_post_meta_by_key.001.diff

wp-includes/post.php

@@ -371 +371 @@
 }
 
 
+function delete_post_meta_by_key($post_meta_key) {
+        global $wpdb, $post_meta_cache, $blog_id;
+        $post_meta_key = $wpdb->escape($post_meta_key);
+        if ( $wpdb->query("DELETE FROM $wpdb->postmeta WHERE meta_key = '$post_meta_key'") ) {
+                unset($post_meta_cache[$blog_id]); // not worth doing the work to iterate through the cache
+                return true;
+        }
+        return false;
+}
+
+
 function get_post_custom($post_id = 0) {
         global $id, $post_meta_cache, $wpdb, $blog_id;