How to calculate number in hours from two times?

Question

PHP

There is a start and end time

$starthours = '08:15:09';  $stophours = '16:45:19'; 
$starthours = intval(($starthours*3600)/3600);
$stophours  = intval(($stophours *3600)/3600);
$diff = $stophours - $starthours;
// $diff = 8; выдает

i need $diff = 08:30:10;

Answer 1

As an option.

$starthours = '08:15:09';  $stophours = '16:45:19';
$diff = strtotime($stophours) - strtotime($starthours) + strtotime('00:00:00');
echo date('H:i:s', $diff);