php计算时间间隔实现程序代码

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

$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");
?>