- var_dump: documentation ( source)
<?php
// '2017-04-07 20:15:00'
$now = new \DateTime('2017-04-26 06:13:00');
// $interval = $now->diff($reservation->lessonDateTime);
// '2017-04-07 15:00:00'
$interval = $now->diff(new \DateTime('2017-04-26 18:15:00'));
$hours = ($interval->days * 24) + $interval->h
+ ($interval->i / 60) + ($interval->s / 3600);
var_dump($interval->h);
var_dump($hours);
var_dump($hours <= 12);