- var_dump: documentation ( source)
<?php
$diff = new DateInterval('PT15M');
$diff2 = new DateInterval('PT30M');
var_dump($diff >= $diff2);
$diff3 = new DateInterval('PT15M');
$diff4 = new DateInterval('PT30M');
var_dump($diff3);
var_dump($diff4);
var_dump($diff >= $diff2);