PHP DateTime包含的差异

Question

我想使用PHP DateTime的diff方法来获取两个日期之间的总天数，包括开始日期和结束日期。

我试过了:

 $start_date = new DateTime('2014-01-01');
 $end_date = new DateTime('2014-01-31');
 $diff = $end_date->diff($start_date)->format("%a");

但是它返回30。

如何使用diff方法来包含结束日期?

Answer 1

试试这个

$start_date = new DateTime('2014-01-01');
$end_date = new DateTime('2014-01-31');
$end_date->modify('+1 day'); //add 1 to include the end date
$diff = $end_date->diff($start_date)->format("%a");

Answer 2

试试这个方法

$diff = $start_date ->diff($end_date ); 
echo $diff ->format('%y years %m months and %d days');