Redis使用watch完成秒杀抢购功能的代码

<"content-type:text/html;charset=utf-8"); 
$redis = new redis(); 
$result = $redis->connect('10.10.10.119', 6379); 
$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; 
  } 
} 
?>