<?
$birthday="1911-05-03";
$birthday=date("Y")."-".date("m",strtotime($birthday))."-".date("d",strtotime($birthday));
$start_date = date("Y-m-d", strtotime('last day of -1 month', strtotime($birthday)) );
$end_date = date("Y-m-d", strtotime('last day of 0 month', strtotime($birthday)) );
?>
<p><?echo "$start_date";?></p>
<p><?echo "$end_date";?></p>
这样吗?

我测试一下，感谢您的回复

$birthday转$birthday太厉害了 奇葩无误