<!DOCTYPE html>
<html>
<head>
<title>PHP实现倒计时功能</title>
</head>
<body>
<?php
date_default_timezone_set('PRC');
$starttimestr = date('Y-m-d H:i:s', strtotime('now'));
$starttimestr= mktime(0,0,0,7,7,2020);
//$endtimestr = date('Y-m-d H:i:s', strtotime('+18 hours 1 minutes'));
$endtimestr = mktime(18,0,0,date('m'),date('d'),date('Y'));
$starttime = strtotime($starttimestr);
$endtime = strtotime($endtimestr);
$nowtime = time();
if ($nowtime < $starttime) {
exit("考试已经结束了，考试时间是：{$starttimestr}至{$endtimestr}");
}
if ($endtime >= $nowtime) {
$lefttime = $endtime - $nowtime; //实际剩下的时间（秒）
} else {
$lefttime = 0;
exit("考试已经结束！");
}
?>
<p>考试开始时间：<?php echo $starttimestr; ?></p>
<p>考试结束时间：<?php echo $endtimestr; ?></p>
<p>
距离考试结束还有：
<span id="RemainD"></span> 天
<span id="RemainH"></span> 小时
<span id="RemainM"></span> 分钟
<span id="RemainS"></span> 秒
</p>
<script type="text/javascript">
var runtimes = 0;
function GetRTime() {
var lefttime = <?php echo $lefttime; ?> * 1000 - runtimes * 1000;
if (lefttime >= 0) {
var nD = s.floor(lefttime / (1000 * 60 * 60 * 24)) % 24;
var nH = Math.floor(lefttime / (1000 * 60 * 60)) % 24;
var nM = Math.floor(lefttime / (1000 * 60)) % 60;
var nS = Math.floor(lefttime / 1000) % 60;
document.getElementById("RemainD").innerHTML = nD;
document.getElementById("RemainH").innerHTML = nH;
document.getElementById("RemainM").innerHTML = nM;
document.getElementById("RemainS").innerHTML = nS;
runtimes++;
setTimeout("GetRTime()", 1000);
} else {
alert('考试结束了！');
location.reload();
}
}
onload = function() {
GetRTime();
}
</script>
</body>
</html>