php计算时间间隔实现程序代码

<?php
/**
 * 时间差计算
 *
 * @param Timestamp $time
 * @return String Time Elapsed
 * @author Shelley Shyan
 * @copyright http://www.111cn.net (Professional PHP Architecture)
 */
function time2Units ($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';
?>

<?php
    $regist1 = "05/12/2006";
    $regist2 = "10/05/2007";

    list($month1,$day1,$year1) = explode("/",$regist1);
    list($month2,$day2,$year2) = explode("/",$regist2);

    $regist1 = mktime(0,0,0,$month1,$day1,$year1);
    $regist2 = mktime(0,0,0,$month2,$day2,$year2);

    $time_difference = $regist2-$regist1;

    echo ("时间差:");
    echo date("Y",$time_difference) - 1970;
    echo ("年");
    echo date("m",$time_difference) - 1;
    echo ("个月");
    echo date("d",$time_difference) - 1;
    echo ("天");
?>