Convert duration in second to duration in ISO8601

duration8601.php

<?php
/*
 * Convert duration in second to duration in ISO8601
 * http://www.w3schools.com/Schema/schema_dtypes_date.asp#Duration Data Type
 * http://en.wikipedia.org/wiki/ISO_8601#Durations
 *
 * @param integer $duration in second seconde
 * @return string duration in ISO8601
 *
 * >= PHP 5.3 : use DateInterval <http://www.php.net/manual/en/dateinterval.construct.php>
 */
function duration8601($second)
{
	$h = intval($second/3600);
	$m = intval(($second -$h*3600)/60);
	$s = $second -($h*3600 + $m*60);
	$ret = 'PT';
	if ($h)
		$ret.=$h.'H';
	if ($m)
		$ret.=$m.'M';
	if ((!$h && !$m) || $s)
		$ret.=$s.'S';
	return $ret;
}
?>

❤❤❤ ty