Redis classic case sharing product flash sale and shopping cart

Summary: Product flash sale case

Second sale case:

<?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-$mywatchkey-1)."<br/>";  
            echo "用户列表：<pre class="brush:php;toolbar:false">";  
            var_dump($mywatchlist);  
        }else{  
            echo "手气不好，再抢购！";exit;  
        }  
    }

According to this principle, we can watch to write the shopping cart of the product, and watch the flag of the product before paying the order (changes when the quantity of the product is equal to 0 ), the payment fails if the flag changes.

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