PHP时间比较和时间差如何计算

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1.<?php   2. $zero1=date(“y-m-d h:i:s”);   3. $zero2=”2010-11-29 21:07:00′;   4. echo “zero1的时间为：”.$zero1.”<br>”;   5. echo “zero2的时间为：”.$zero2.”<br>”;   6. if(strtotime($zero1)<strtotime($zero2)){   7.  echo “zero1早于zero2′;   8. }else{   9.  echo “zero2早于zero1′;   10. }   11. ?>  复制代码上面是比较两个绝对时间的大小复制代码<?php   $zero1=strtotime (date("y-m-d h:i:s")); //当前时间  ,注意H 是24小时 h是12小时 $zero2=strtotime ("2014-1-21 00:00:00");  //过年时间，不能写2014-1-21 24:00:00  这样不对 $guonian=ceil(($zero2-$zero1)/86400); //60s*60min*24h   echo "离过年还有<strong>$guonian</strong>天！";   ?>  复制代码上面是倒计时小程序 实例代码 复制代码<?php//PHP计算两个时间差的方法 $startdate="2010-12-11 11:40:00";$enddate="2012-12-12 11:45:09";$date=floor((strtotime($enddate)-strtotime($startdate))/86400);$hour=floor((strtotime($enddate)-strtotime($startdate))%86400/3600);$minute=floor((strtotime($enddate)-strtotime($startdate))%86400/60);$second=floor((strtotime($enddate)-strtotime($startdate))%86400%60);echo $date."天<br>";echo $hour."小时<br>";echo $minute."分钟<br>";echo $second."秒<br>";?>复制代码  <?php/** * 时间差计算 * * @param Timestamp $time * @return String Time Elapsed * @author Shelley Shyan * @copyright http://phparch.cn (Professional PHP Architecture) */function time2Units ($time){   $year   = floor($time / 60 / 60 / 24 / 365);   $time  -= $year * 60 * 60 * 24 * 365;   $month  = floor($time / 60 / 60 / 24 / 30);   $time  -= $month * 60 * 60 * 24 * 30;   $week   = floor($time / 60 / 60 / 24 / 7);   $time  -= $week * 60 * 60 * 24 * 7;   $day    = floor($time / 60 / 60 / 24);   $time  -= $day * 60 * 60 * 24;   $hour   = floor($time / 60 / 60);   $time  -= $hour * 60 * 60;   $minute = floor($time / 60);   $time  -= $minute * 60;   $second = $time;   $elapse = '';   $unitArr = array('年'  =>'year', '个月'=>'month',  '周'=>'week', '天'=>'day',                    '小时'=>'hour', '分钟'=>'minute', '秒'=>'second'                    );   foreach ( $unitArr as $cn => $u )   {       if ( $$u > 0 )       {           $elapse = $$u . $cn;           break;       }   }   return $elapse;}$past = 2052345678; // Some timestamp in the past$now  = time();     // Current timestamp$diff = $now - $past;echo '发表于' . time2Units($diff) . '前';?>
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