PHP时间日期比较
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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.
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