• 使用樂觀鎖的方式來實現秒殺功能

<?php
header("content-type:text/html;charset=utf-8");
$redis = new redis();
$result = $redis->connect('IP', PORT);
$mywatchkey = $redis->get("mywatchkey");
$rob_total = 100;   //搶購數量
if($mywatchkey<$rob_total){
    $redis->watch("mywatchkey");
    $redis->multi();
    
    //設置延遲，方便測試效果。
    sleep(5);
    //插入搶購數據
    $redis->hSet("mywatchlist","user_id_".mt_rand(1, 9999),time());
    $redis->set("mywatchkey",$mywatchkey+1);
    $rob_result = $redis->exec();
    if($rob_result){
        $mywatchlist = $redis->hGetAll("mywatchlist");
        echo "搶購成功！<br/>";
        echo "剩余數量：".($rob_total-$mywatchkey-1)."<br/>";
        echo "用戶列表：<pre>";
        var_dump($mywatchlist);
    }else{
        echo "手氣不好，再搶購！";exit;
    }
}
?>