PHP获取指定月份的第一天和最后一天

1. [代码][PHP]代码    

$date = date(time());
$start_date = date('Y-m-d', mktime(00, 00, 00, date('m', strtotime($date))+1, 01));
$end_date = date('Y-m-d', mktime(23, 59, 59, date('m', strtotime($date))+2, 00));