- print_r: documentation ( source)
<?php
$now = new \DateTime();
$now->setTime(16,00);
print_r($now);
$punchIn = new \DateTime(); // 10:55 am
$punchIn->setTime(15,55);
$hourIn = (int)$now->diff($punchIn)->format('%R%H');
$minIn = (int)$now->diff($punchIn)->format('%i');
print_r($hourIn*60+$minIn);