Ticket #4476: cache.php.diff

wp-includes/cache.php

@@ -92 +92 @@
         function delete($id, $group = 'default', $force = false) {
                 if (empty ($group))
                         $group = 'default';
-
-                if (!$force && false === $this->get($id, $group, false))
+                if ( empty($id) && isset($this->cache[$group])) {
+                        foreach( (array) $this->cache[$group] as $key => $value) {
+                                $id = ( is_string($value) && $this->get( $value, $group, false) ) ? (string) $value : (string) $key;
+                                $this->non_existant_objects[$group][$id] = true;
+                                $this->dirty_objects[$group][] = $id;
+                        }
+                        unset($this->cache[$group]);
+                } elseif (!$force && false === $this->get($id, $group, false)) {
                         return false;
-
-                unset ($this->cache[$group][$id]);
-                $this->non_existant_objects[$group][$id] = true;
-                $this->dirty_objects[$group][] = $id;
+                } else {
+                        unset ($this->cache[$group][$id]);
+                        $this->non_existant_objects[$group][$id] = true;
+                        $this->dirty_objects[$group][] = $id;
+                }
                 return true;
         }