一、单机版

模拟秒杀伪代码

        $group_id  = 21;
        $user_id   = uniqid();
        $lockKey   = 'lock:user_id_' . $user_id;
        $resultKey = 'res:group_id_' . $group_id;
        $info      = Redis::get($resultKey);
        if (!is_null($info) && $info <= 0) {
            return "秒杀结束！";
        }
        $lock = Redis::set($lockKey, $user_id, 'PX', 10000, 'NX');
        if ($lock) {
            DB::beginTransaction();
            try {
                $res = DB::table('group')->where('id', $group_id)->where('days', '>', 0)->decrement('days'); //库存-1
                if ($res) {
                    $info = DB::table('group')->where('id', $group_id)->value('days'); //商品剩余个数
                    $res  = DB::table('notify_log')->insert(['log' => '用户id:' . $user_id . '抢购成功，商品剩余' . $info . '个']); //插入日志（订单）
                    if ($res) {
                        Redis::set($resultKey, $info);
                        //释放锁
                        $luaScript = <<<EOF
if redis.call("get",KEYS[1]) == ARGV[1]
then
    return redis.call("del",KEYS[1])
else
    return 0
end
EOF;
                        $res       = Redis::eval($luaScript, 1, $lockKey, $user_id);
                    }
                }
                DB::commit();
                return '抢购成功！';
            } catch (\Exception $exception) {
                DB::rollBack();
                return '请稍后重试！';
            }
        }
        echo "请稍后重试！";