linux下安装redis和phpredis扩展

<?php
class MyRedis{
    private static $handler;

    private static function handler(){
        if(!self::$handler){
            self::$handler = new Redis();
            self::$handler -> connect(‘127.0.0.1‘,‘6379‘);
        }
        return self::$handler;
    }
    //获取缓存值
    public static function get($key){
        $value = self::handler() -> get($key);
        $value_serl = @unserialize($value);
        if(is_object($value_serl)||is_array($value_serl)){
            return $value_serl;
        }
        return $value;
    }
   //设置缓存值 
    public static function set($key,$value){
        if(is_object($value)||is_array($value)){
            $value = serialize($value);
        }

        return self::handler() -> set($key,$value);
    }
    //设置缓存值(含有时间)
    public static function setex($key,$time,$value){
        if(is_object($value)||is_array($value)){
            $value = serialize($value);
        }

        return self::handler() -> setex($key,$time,$value);
    }
     //删除缓存
    public static function del($key){
        return self::handler() -> del($key);
    }
}