help anyone =)

		$a1 = explode(":",$arv);
		$a2 = explode(":",$arv2);
		$arv_x1 = mktime(0,trim($a1[0]),trim($a1[1]),0,0,0);
		$arv_x2 = mktime(0,trim($a2[0]),trim($a2[1]),0,0,0);
		$arv_ = date("G:s",$arv_x1+$arv_x2);
		echo "$arv + $arv2 => $arv_ <br>";


3:28 + 3:28 => 23:56