Redis案例——商品秒杀，购物车

秒杀案例：

 <?php
     header("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;
         }
     }