protected function parseVersionResponse(array $lines)
    {
        // Extract meta data
        $metaData = explode(self::COMMAND_SEPARATOR, $lines[0]);

        // If Version response valid
        if ($metaData[0] === strtoupper(self::COMMAND_VERSION)) {
            $result = $metaData[1];

        } else {
            $result = $this->setLastResponse(self::MEMCACHED_FAILURE);
        }

        return $result;
    }