- var_dump: documentation ( source)
- time: documentation ( source)
- strtotime: documentation ( source)
<?php
var_dump((int)strtotime(false) + (29 * 24 * 60 * 60) <= time(), (int)strtotime('') + (29 * 24 * 60 * 60) <= time(), strtotime('-31 days') + ( 29 * 24 * 60 * 60) <= time());