class Seckill 
{
    protected $redis;
    public function __construct()
    {
        $this->redis = new \Redis();
        $this->redis->connect('127.0.0.1',6379);
    }

    /**
     * 初始化
     * @return int
     */
    public function init()
    {
        $num = 10;
        $gid = 1;   // 商品编号
        for($i = 0; $i < $num; $i++) {
            $this->redis->rpush('seckill_goods:'.$gid, 1);  // 将商品push到商品列表, 值无意义
        }
        $len = $this->redis->llen('seckill_goods:'.$gid);
        return $len;
    }

    /**
     * 抢购
     * @return string
     */
    public function buy()
    {
        $uid = 1;   // 用户编号
        $gid = 1;   // 商品编号
        //$result = $this->redis->sIsMember('seckill_user:'.$gid, $uid);  // 用户已参与过活动
        //if ($result) {
        //    return '您已参与过该活动';
        //}
        $len = $this->redis->lpop('seckill_goods:'.$gid);  // 列表为空则抢完了
        if(!$len) {
            return '已抢完';
        }
        $this->redis->rpush('seckill_order:'.$gid, $uid);
        //$this->redis->sAdd('seckill_user:'.$gid, $uid);  // 将该用户加入集合
        return '恭喜，抢购成功';
    }
}