PHP/Graphics Image/imagedeallocate

Using imagedeallocate()

   <source lang="html4strict">

<?php

   define("WIDTH", 200);
   define("HEIGHT", 200);
   $img = imagecreate(WIDTH, HEIGHT);
   $bg = $white = imagecolorallocate($img, 0xFF, 0xFF, 0xFF);
   $black = imagecolorallocate($img, 0, 0, 0);
   imagefilledrectangle($img, 10, 10, WIDTH-11, HEIGHT-11, $black);
   imagecolordeallocate($img, $black);
   $red = imagecolorallocate($img, 0xFF, 0, 0);
   header("Content-Type: image/png");
   imagepng($img);

?>

 </source>