PHP/Graphics Image/imagefilltoborder

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Using imagefill() and imagefilltoborder()

   <source lang="html4strict">

<?php

   define("WIDTH", 200);
   define("HEIGHT", 200);
   $img = imagecreate(WIDTH, HEIGHT);
   $background = $white = imagecolorallocate($img, 0xFF, 0xFF, 0xFF);
   $black = imagecolorallocate($img, 0, 0, 0);
   $red = imagecolorallocate($img, 0xFF, 0, 0);
   $blue = imagecolorallocate($img, 0, 0, 0xFF);
   $center_x = (int)WIDTH/2;
   $center_y = (int)HEIGHT/2;
   imagerectangle($img, 0, 0, WIDTH-1, HEIGHT-1, $black);
   imageline($img, 0, 0, WIDTH-1, HEIGHT-1, $red);
   imagefill($img, 2, 20, $black);
   imagefilltoborder($img, WIDTH-2, 20, $red, $blue);
   header("Content-Type: image/png");
   imagepng($img);

?>

 </source>