redis实现秒杀功能

• 使用乐观锁的方式来实现秒杀功能

<?php
header("content-type:text/html;charset=utf-8");
$redis = new redis();
$result = $redis->connect('IP', PORT);
$mywatchkey = $redis->get("mywatchkey");
$rob_total = 100;   //抢购数量
if($mywatchkey<$rob_total){
    $redis->watch("mywatchkey");
    $redis->multi();
    
    //设置延迟，方便测试效果。
    sleep(5);
    //插入抢购数据
    $redis->hSet("mywatchlist","user_id_".mt_rand(1, 9999),time());
    $redis->set("mywatchkey",$mywatchkey+1);
    $rob_result = $redis->exec();
    if($rob_result){
        $mywatchlist = $redis->hGetAll("mywatchlist");
        echo "抢购成功！<br/>";
        echo "剩余数量：".($rob_total-$mywatchkey-1)."<br/>";
        echo "用户列表：<pre>";
        var_dump($mywatchlist);
    }else{
        echo "手气不好，再抢购！";exit;
    }
}
?>