} elseif ($len === 3 || $len === 4) {
            $r = hexdec($str[0] . $str[0]);
            $g = hexdec($str[1] . $str[1]);
            $b = hexdec($str[2] . $str[2]);
            $a = $len === 4 ? hexdec($str[3] . $str[3]) : 255;