public function connect($host = '127.0.0.1', $port = 11211)
    {
        if (!isset($this->servers[$host . ':' . $port])) {
            $this->server = new \Memcache();
            $this->server->connect($host, $port);

            $this->servers[$host . ':' . $port] = $this->server;
        } else {
            $this->server = $this->servers[$host . ':' . $port];
        }

        return true;
    }