- var_dump: documentation ( source)
- date: documentation ( source)
- strtotime: documentation ( source)
<?php
var_dump(date('Y-m-d H:i:s', strtotime('today +2.5 hours')));
var_dump(date('Y-m-d H:i:s', strtotime('today +2,5 hours')));
var_dump(date('Y-m-d H:i:s', strtotime('today +2 5 hours')));
var_dump(date('Y-m-d H:i:s', strtotime('today +7 hours')));