How to implement countdown in php: 1. Set the time zone through date_default_timezone_set; 2. Configure the daily activity time period; 3. Calculate the time difference between the server and the client; 4. Through "function GetRTime(){... }" method to implement countdown.
The operating environment of this article: Windows7 system, PHP7.1 version, DELL G3 computer
How does php implement countdown?
Detailed explanation of the implementation method of php real-time countdown function
The details are as follows:
In the past few days, the company is going to have a limited time shopping function. This It is necessary to count down and have a real-time countdown.
Requirements:
1) There must be a real-time countdown display of hours, minutes and seconds
2) The client can modify the date The time 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 exam and other systems.
Solution Ideas:
1) You can’t use ajax to 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 impact of the client’s date and time modification on our display.
The solution is to calculate the time difference between the client’s time and the server’s time. This solves the problem .
This way you only need to run php once. The real-time countdown time will be synchronized with the server time.
Theoretically it is synchronized, but in actual testing there will be an error of 1 second. (specifically The reason is related to the Internet speed. The faster the Internet speed, the smaller the error), but this will never 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 id="strong-nbsp-id-RemainH-XX-strong-strong-nbsp-id-RemainM-XX-strong-strong-nbsp-id-RemainS-XX-strong"><strong id="RemainH">XX</strong>:<strong id="RemainM">XX</strong>:<strong id="RemainS">XX</strong></h1>
</body>
</html>Example 2:
Modified some of the bugs above
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 id="strong-nbsp-id-RemainH-XX-strong-strong-nbsp-id-RemainM-XX-strong-strong-nbsp-id-RemainS-XX-strong"><strong id="RemainH">XX</strong>:<strong id="RemainM">XX</strong>:<strong id="RemainS">XX</strong></h1>
</body>
</html>Example 3:
Ideas 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 id="strong-nbsp-id-RemainH-XX-strong-strong-nbsp-id-RemainM-XX-strong-strong-nbsp-id-RemainS-XX-strong"><strong id="RemainH">XX</strong>:<strong id="RemainM">XX</strong>:<strong id="RemainS">XX</strong></h1>
</body>
</html>Recommended study: "PHP Video Tutorial"
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