Memcache类

class Memcache{
    private static $mem = null;
    public function mem_create(){
        self::$mem = new Memcache();
        self::$mem->connect('127.0.0.1');
    }
    public function __destruct(){
        if(self::$mem instanceof Memcache) self::$mem->close();
    }
    public fucntion mem_set($k,$v,$boolean = false,$expire = 300){
        if(!self::$mem instanceof Memcache) $this->mem_create();
        return self::$mem->set($k,$v,$boolean,$e);
    }
    public fucntion mem_add($k,$v,$boolean = false,$expire = 300){
        if(!self::$mem instanceof Memcache) $this->mem_create();
        return self::$mem->add($k,$v,$boolean,$e);
    }
    public fucntion mem_get($k){
        if(!self::$mem instanceof Memcache) $this->mem_create();
        return self::$mem->get($k);
    }
}