Get total time from in and out time

Get total time and min from in and out time.

$all = round((strtotime($records[‘att_out_time’]) – strtotime($records[‘att_in_time’])) / 60);

//Eg – att_out_time – 2016-04-26 19:39:38  , att_in_time – 2016-04-26 09:49:50
$d = floor ($all / 1440);
$h = floor (($all – $d * 1440) / 60);
$m = $all – ($d * 1440) – ($h * 60);