public function readMany($keys)
    {
        $cacheKeys = [];
        foreach ($keys as $key) {
            $cacheKeys[] = $this->_key($key);
        }

        $values = $this->_Memcached->getMulti($cacheKeys);
        $return = [];
        foreach ($keys as &$key) {
            $return[$key] = array_key_exists($this->_key($key), $values) ?
                $values[$this->_key($key)] : false;
        }

        return $return;
    }