PHP Memcache::getAllKeys方法代碼示例

 /**
  * Delete all keys from the cache
  *
  * @param bool $check If true no deletes will occur and instead CakePHP will rely
  *   on key TTL values.
  * @return bool True if the cache was successfully cleared, false otherwise
  */
 public function clear($check)
 {
     if ($check) {
         return true;
     }
     $keys = $this->_Memcached->getAllKeys();
     foreach ($keys as $key) {
         if (strpos($key, $this->settings['prefix']) === 0) {
             $this->_Memcached->delete($key);
         }
     }
     return true;
 }

 /**
  * Delete all cache entries.
  *
  * Beware of using this method when
  * using shared memory cache systems, as it will wipe every
  * entry within the system for all clients.
  *
  *     // Delete all cache entries in the default group
  *     Cache::instance('memcached')->delete_all();
  *
  * @return  boolean
  */
 public function delete_all($filter = FALSE)
 {
     if ($filter === FALSE) {
         $result = $this->_memcached->flush();
         // We must sleep after flushing, or overwriting will not work!
         // @see http://php.net/manual/en/function.memcached-flush.php#81420
         sleep(1);
         return $result;
     } else {
         $keys = $this->_memcached->getAllKeys();
         foreach ($keys as $key) {
             if (strpos($key, $filter) === 0) {
                 $this->_memcached->delete($key);
             }
         }
     }
 }