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