- var_dump: documentation ( source)
- date_default_timezone_set: documentation ( source)
<?php
date_default_timezone_set('Europe/Paris');
$firstOctober = new \DateTime('2016-10-01 00:00:00');
$endOctober = new \DateTime('2016-10-31 00:00:00');
var_dump(
$firstOctober->diff($endOctober)->m
);