PHP RedisSingleton

<?php<br /><br />/**<br /> * Created by PhpStorm.<br /> * User: xiongzai<br /> * Date: 2016/5/17<br /> * Time: 16:31<br /> */<br /><br />namespace Think;<br /><br />class RedisSingleton {<br /><br />    public $redis = null;<br /><br />    static protected $ins=null;<br /><br />    final protected function __construct(){<br />        self::setRedis();<br />    }<br /><br />    private function __clone(){}<br /><br />    static public function getInstance(){<br />        if (self::$ins instanceof self) {<br />            return self::$ins;<br />        }<br />        self::$ins=new self();<br />        return self::$ins;<br />    }<br /><br /><br />     private function setRedis(){<br />        try{<br />            $redis = new \Redis();<br />            $redis->connect( C('REDIS_HOST'), C('REDIS_PORT') );<br />            $redis->auth( C('REDIS_AUTH') );<br />            $this->redis = $redis;<br />            unset($redis);<br />        }catch(Exception $e){<br />            echo $e->getMessage().'<br/>';<br />        }<br />    }<br /><br />}<br /><br />