PHP实现倒计时功能

本文实例为大家分享了PHP实现倒计时功能的具体代码，供大家参考，具体内容如下

<!DOCTYPE html><html><head><title>PHP实现倒计时功能</title></head><body><?phpdate_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>

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