$chars = array ( '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'A', 'b', 'B', 'c', 'C' );$imageid = 10; $finalid = sprintf("%c", $chars[$imageid]); $idtoprint = substr(md5(time()), 0, 5)."_".$finalid;