php计算时间差，时间比较，时间计算

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<?php  

$zero1=date(“y-m-d h:i:s”);  

$zero2=”2010-11-29 21:07:00′;  

echo “zero1的时间为：”.$zero1.”<br>”;  

echo “zero2的时间为：”.$zero2.”<br>”;  

if(strtotime($zero1)<strtotime($zero2)){  

echo “zero1早于zero2′;  

}else{  

echo “zero2早于zero1′;  

}  

?> 

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上面是比较两个绝对时间的大小

 

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<?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！";  

?> 

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上面是倒计时小程序 实例代码

 

  

 

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<?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>";

 

?>

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<?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';

?>