convert time into seconds php code example

Example 1: seconds to minutes php

echo gmdate("H:i:s", 685);

Example 2: php microtime to seconds

echo date("H:i:s",$endtime-$starttime);

$duration = $endtime-$starttime;
$hours = (int)($duration/60/60);
$minutes = (int)($duration/60)-$hours*60;
$seconds = (int)$duration-$hours*60*60-$minutes*60;