public function clear($check)
    {
        if ($check) {
            return true;
        }
        $info = wincache_ucache_info();
        $cacheKeys = $info['ucache_entries'];
        unset($info);
        foreach ($cacheKeys as $key) {
            if (strpos($key['key_name'], $this->_config['prefix']) === 0) {
                wincache_ucache_delete($key['key_name']);
            }
        }

        return true;
    }