PHP时间日期比较

若要使用PHP来比较日期，最好用DateTime::diff

但是这个是5.3才支持的，如果没有这样的环境，可以使用<、>来比较

如下例子，会输出right

$date1=strtotime(‘2009-8-9 20:00‘);
$date2=strtotime(‘2009-9-9 1:00‘);
if($date1<$date2)
echo ‘right‘;
else
echo ‘wrong‘;

注：DateTime::diff

DateTime::diff

(PHP 5 >= 5.3.0)

DateTime::diff — Returns the difference between two DateTime objects

Description

public DateInterval DateTime::diff ( DateTime $datetime [, bool $absolute ] )

Returns the difference between two DateTime objects.

Parameters

datetime

The date to compare to.

 

absolute

Whether to return absolute difference. Defaults to FALSE.

Return Values

The difference between two dates.

PHP时间日期比较

原文：http://www.cnblogs.com/mafeng/p/5598748.html