Seconds to HH:MM:SS

$seconds = 3600; // any starting value
$days = floor($seconds/86400);
$days_mod = $seconds%86400;
$hours = floor($days_mod/3600);
$hours_mod = $days_mod%3600;
$minutes = floor($hours_mod/60);
$minutes_mod = $hours_mod%60;
$seconds = floor($minutes_mod);
echo $minutes.'minutes and '.$seconds.' seconds';