imagefill
    (PHP 3, PHP 4, PHP 5)
imagefill -- Flood fill
Description
bool 
imagefill ( resource image, int x, int y, int color )
     imagefill() performs a flood fill starting at
     coordinate x, y
     (top left is 0, 0) with color color in the
     image image.
    
     
Example 1. imagefill() example 
<?php
  $im = imagecreatetruecolor(100, 100);
  // sets background to red $red = imagecolorallocate($im, 255, 0, 0); imagefill($im, 0, 0, $red);
  header('Content-type: image/png');  imagepng($im); imagedestroy($im); ?>
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     See also imagecolorallocate().