[PHP知识库]laravel7 秒杀简单防超卖

//校验库存
    public function checkAll(Request $request)
    {
        $data = $request->post();
        
        //goods_id

        //获取token
        $token = explode(' ',$request->header('authorization'))[1];
        //进行查看
        $userInfo = Cache::get($token);
        //抢购用户id
        $userID = $userInfo->id;

       //查出订单表是否有此用户
        $user =  Order::where('user_id',$userID)->get()->toarray();

        //如存在拒绝请求,返回数据
        if (!empty($user)){
            return ['code'=>302,'msg'=>'你已抢过了'];
        }

        //        查出当前商品的库存按商品id循环存如redis队列,这一步应在添加商品的时候做操作
        $goods = Goods::find($data['goods_id'])->toarray();
            for(!$i=1; $i <= $goods['goods_nums']; $i++){
                Redis::lpush($goods['id'], $i);
            }
           //redis队列库存消耗一个
        $count = Redis::rpop($goods['id']);
          //如果消耗之后,队列为0说明订单已经满了,返回提示
        $data['user_id'] = $userID;
        if($count != 0){
            return self::doOrder($data);
        } else {
            return ['code'=>302,'msg'=>'无库存'];
        }
    }

//没满走订单创建
    public function doOrder($goodsNum)
    {
//        生成唯一订单号
        $orderNo = $this->orderNo();
//        订单号入订单信息
        $goodsNum['order_sn'] = $orderNo;
        try {
            \DB::beginTransaction(); //启动事务
//            入库之后查出此条数据,接口返回
            $data = Order::create($goodsNum)->toarray();
            $order = Order::find($data['id']);
            \DB::commit(); //提交事务
            return ['code'=>200,'msg'=>'成功','data'=>$order];
        } catch (Exception $e) {
            \DB::rollBack();
            return ['code'=>400,'msg'=>'失败'];
        }
    }

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//生成唯一订单号
    public function orderNo()
    {
        return date('Ymd').substr(implode(NULL, array_map('ord', str_split(substr(uniqid(), 7, 13), 1))), 0, 8);
    }

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//当用户将订单提交之后进行商品表库存减一
    public function orderForm(Request $request)
    {
        $id = $request->input('id');

        $data = Goods::find($id);
        $data->goods_nums  = $data->goods_nums-1;
        $data->save();
        return ['code'=>200,'msg'=>'库存已减'];
    }

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