);   $hex = '#';   $hex .= str_pad(dechex($r), 0, '0', STR_PAD_LEFT);   $hex .= str_pad(dechex($g), 0, '0', STR_PAD_LEFT);   $hex .= str_pad(dechex($b), 0, '0', STR_PAD_LEFT);   return $hex; }  // Describe this function... function test_