dechex() problems :/

[Knifee]

i was starting to write some code that would let me build css from a few colours, but i cant seem to get dechex to work.... can any1 see some obvous reason why this doesn't output a hex.

<?
  function colourchanger($colour, $direction, $amount) {
             echo $colour."<br>";
           $colour = hexdec($colour) ;
           echo $colour."<br>";
           if($direction = 'up') { $colour = $colour + $amount; }
            else { $colour = $colour - $amount; }
                  echo $colour."<br>";
            $colour = dechex($colour);
                    echo $colour."<br>";
            return $colour;

  }

   $basecolour = colourchanger ("FFFFFF", "up", "50")  ;
      echo    "colour= ".$basecolour;
?>

when i run this i get:
FFFFFF
16777215
16777265
1000031
colour= 1000031

i dont understand why the $colour = dechex($colour); doesn't work?? ne ideas?
thx. Knifee

[jernhenrik]

It seems to work? You are using FFFFFF which is the color white (and the 'highest' color, if there is such a thing) you get a number with hex thats beyond the limits of the color charts.

test it with AAAAAA and see what you get...

Alternatly you could try a different approach eg split up the color string into the respective colors, so that you can change the value for the 3 base colors instead.

eg.

$r = hexdec(substr($color, 0, 2));
$g = hexdec(substr($color, 2, 2));
$b = hexdec(substr($color, 4, 2));

or something like that, and then add a value to a given base color.

hth

[Knifee]

🙂 yer works fine, i knew it would be something silly.... thx for the help