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PHP 实现的商品秒杀计时代码 - 站长搜索
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PHP 实现的商品秒杀计时代码

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2014-12-08 03:45:03 转载来源: 网络整理/侵权必删

本文是一个PHP 实现的商品秒杀计时代码示例,感兴趣的同学参考下。 需求: 比如要做一个限时购物的功能,这就要做到倒计时,要有实时的倒计时

本文是一个PHP 实现商品秒杀计时代码示例,感兴趣的同学参考下。

需求:

比如要做一个限时购物的功能,这就要做到倒计时,要有实时的倒计时。
要求要有小时分钟秒的实时倒计时的显示,用户端修改日期时间不会影响到倒计时的正常显示(也就是以服务器时间为准)。

其实这和很多的考试等系统的时间限制功能同样的要求。

总不能用ajax每秒都获取服务器时间吧,所以实时倒计时一定要用javascript实现。这很简单,网上一大把的例子。

现在问题是解决用户端修改日期时间对我们的显示的影响。

解决的办法是计算出用户端的时间和服务器的时间差,这样问题的完成解决了。

这样只需要运行一次php,实时倒计时的时间就和服务器的时间同步了。

理论是同步的,但实际测试会有1秒的误差。(具体原因就是和网速有关,网速越快,误差就越小),但这决不会影响到我们上面的要求了。

注:秒杀时间从早上点到晚上10点。

代码如下:


<?php

//php的时间是以秒算。js的时间以毫秒算

date_default_timezone_set('PRC');
//date_default_timezone_set("Asia/Hong_Kong");//地区

//配置每天的活动时间段
$starttimestr = "08:00:00";
$endtimestr = "22:00:00";

$starttime = strtotime($starttimestr);
$endtime = strtotime($endtimestr);
$nowtime = time();
if ($nowtime<$starttime){
die("活动还没开始,活动时间是:{$starttimestr}至{$endtimestr}");
}
$lefttime = $endtime-$nowtime; //实际剩下的时间(秒)
?>

<script language="JavaScript">
<!-- //
var runtimes = 0;
function GetRTime(){
var nMS = <?=$lefttime?>*1000-runtimes*1000;
var nH=Math.floor(nMS/(1000*60*60))%24;
var nM=Math.floor(nMS/(1000*60)) % 60;
var nS=Math.floor(nMS/1000) % 60;
document.getElementById("RemainH").innerHTML=nH;
document.getElementById("RemainM").innerHTML=nM;
document.getElementById("RemainS").innerHTML=nS;
if(nMS>5*59*1000&&nMS<=5*60*1000)
{
alert("还有最后五分钟!");
}
runtimes++;
setTimeout("GetRTime()",1000);
}
window.onload=GetRTime;
// -->
</script>

<h4><strong id="RemainH">XX</strong>:<strong id="RemainM">XX</strong>:<strong id="RemainS">XX</strong></h4>

标签: PHP 实现 商品 秒杀 计时 代码


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