php 中的秒杀

控制器层
 //秒杀 首先要判断库存  其次高并发  然后入库
    public function goods_do()
    {
        $gid=input("get.gid");
        $user_name=Session::get("user_name");
        $obj = new Goods();
        $ku_num=$obj->getNum($gid);
        if($ku_num<1)
        {//库存不够
            return 1;
        }

        /*$redis=new Redis();
        $redis->connect('127.0.0.1','6379');
        $redis->lPush("spick",$user_name);*/

        $data['user_name']=$user_name;
        $data['g_id']=$gid;
        $data['add_time']=time();
        $data['payment']=0;
        $paymentObj = new Payment();
        $id=$paymentObj->add_payment($data);
        Session::set('id',$id);
        if($id)
        {
            return 1;
//            $this->success("秒杀成功，正在跳转支付页面",'payment_show');
        }
    }