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    11211, '192.168.0.12' => 11211];    private function __construct($host = '', $port = 11211, $init = false)    {
            !empty($host) && $_memServers = [trim($host) => $port];        $init && $this->_start();    }    public static function getInstance($host = '', $port = 11211, $init = true)    {
            if (self::$_instance == null) {            self::$_instance = new self($host, $port, $init);        }        return self::$_instance;    }    private function _start()    {
        }    public function addMemServer()    {
        }    public function get()    {
        }    public function set()    {
        }    public function setSessId()    {
        }    public function getSessId()    {
        }}

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