求两个日期相差的天数

[php]代码库

<?php
function maketime($date)
{
	list($year,$month,$day) = explode("-",$date);
	return mktime(0,0,0,$month,$day,$year);
}

$date1 = "2012-08-29";
$date2 = "2013-01-01";
$d = (maketime($date2) - maketime($date1)) / (3600*24);
echo "$date1 - $date2<br /> 相差 $d 天";
?>