Detailed explanation of how to implement real-time countdown function in PHP-PHP Tutorial-php.cn

Detailed explanation of how to implement real-time countdown function in PHP

墨辰丷

Release： 2023-03-27 21:56:02

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This article mainly introduces the implementation method of PHP real-time countdown function, and analyzes the specific steps and related operation skills of PHP combined with the timestamp operation of front-end JS to implement the countdown function based on specific examples. Friends who need it can refer to it

The example in this article describes the implementation method of PHP real-time countdown function. I would like to share it with you for your reference. The details are as follows:

In the past few days, the company is going to have a limited time shopping function. This requires a countdown and a real-time countdown.

Requirements:

1) There must be a real-time countdown display of hours, minutes and seconds
2) Modifying the date and time on the client side will not affect the normal display of the countdown (that is, based on the server time)

In fact, this has the same requirements as the time limit function of many examination and other systems.

Solution ideas:

1) You cannot always use ajax every time Get the server time every second.

So the real-time countdown must be implemented with javascript. This is very simple. There are a lot of examples on the Internet.

2) The current problem is to solve the problem of modifying the date and time on the client side. Impact on our display.
The solution is to calculate the time difference between the client's time and the server's time. In this way, the problem is solved.

In this way, you only need to run php once. The real-time countdown time is equal to The time of the server is synchronized. The theory is that it is synchronized, but in actual testing there will be an error of 1 second. (The specific reason is related to the network speed. The faster the network speed, the smaller the error), but this is definitely the case. It will not affect our above requirements.

Example:

Code:

<?php
//php的时间是以秒算。js的时间以毫秒算
date_default_timezone_set("Asia/Hong_Kong");//地区
//配置每天的活动时间段
$starttimestr = "09:00:00";
$endtimestr = "18:30:00";
$starttime = strtotime($starttimestr);
$endtime = strtotime($endtimestr);
$nowtime = time();
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>PHP实时倒计时!</title>
<script language="JavaScript">
<!-- //
var EndTime=<?=$endtime*1000?>;
var NowTime = new Date();
//计算出服务器和客户端的时间差。
var dTime = <?=$nowtime*1000?>-NowTime.getTime();
function GetRTime(){
var NowTime = new Date();
var nMS = EndTime - NowTime.getTime()-dTime;
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！");
}
setTimeout("GetRTime()",1000);
}
window.onload=GetRTime;
// -->
</script>
</head>
<body>
<h1><strong id="RemainH">XX</strong>:<strong id="RemainM">XX</strong>:<strong id="RemainS">XX</strong></h1>
</body>
</html>

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Example 2:

Modified some of the above bugs

Code:

<?php
//php的时间是以秒算。js的时间以毫秒算
date_default_timezone_set("Asia/Hong_Kong");//地区
//配置每天的活动时间段
$starttimestr = "09:00:00";
$endtimestr = "18:30:00";
$starttime = strtotime($starttimestr);
$endtime = strtotime($endtimestr);
$nowtime = time();
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>PHP实时倒计时!</title>
<script language="JavaScript">
<!-- //
var EndTime=<?=$endtime*1000?>;
var NowTime = new Date();
//计算出服务器和客户端的时间差。
var dTime = NowTime.getTime()-<?=$nowtime*1000?>;
var runtimes = 0;
function GetRTime(){
var NowTime = new Date();
var dTimeNew = NowTime.getTime()-<?=$nowtime*1000?>;
var dTimesM = Math.abs(Math.floor((dTimeNew-runtimes*1000-dTime)/1000));//客户端时间和服务器当前时间的差
if (dTimesM>1) {//如果用户修改了客户端时间，就重新load本页
window.location.reload();
}
var nMS = EndTime - NowTime.getTime()+dTime;
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>
</head>
<body>
<h1><strong id="RemainH">XX</strong>:<strong id="RemainM">XX</strong>:<strong id="RemainS">XX</strong></h1>
</body>
</html>

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Example 3:

The idea is different, much simpler.

Code:

<?php
//php的时间是以秒算。js的时间以毫秒算
date_default_timezone_set("Asia/Hong_Kong");//地区
//配置每天的活动时间段
$starttimestr = "09:00:00";
$endtimestr = "13:50:00";
$starttime = strtotime($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）
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>PHP实时倒计时!</title>
<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>
</head>
<body>
<h1><strong id="RemainH">XX</strong>:<strong id="RemainM">XX</strong>:<strong id="RemainS">XX</strong></h1>
</body>
</html>

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The above is The entire content of this article is hoped to be helpful to everyone's study.

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