Online PHP editor | refs for bNiBm

<?php namespace extension\calendar\classes { error_reporting(E_ALL); use \DateInterval; use \DateTime; class Test extends DateTime { public function add(DateInterval $interval) { return parent::add($interval); // TODO: Change the autogenerated stub } } $t=new Test(); $t->add(new DateInterval('P4M')); echo $t->format(DateTime::W3C); }