imagefill
(PHP 3, PHP 4, PHP 5)
imagefill -- Flood fill
Description
bool
imagefill ( resource image, int x, int y, int color )
Performs a flood fill starting at the given coordinate (top left is 0, 0)
with the given color in the
image.
Parameters
imageAn image resource, returned by one of the image creation functions,
such as imagecreatetruecolor().
x
x-coordinate of start point
y
y-coordinate of start point
color
The fill color. A color identifier created with
imagecolorallocate()
Return Values
Returns TRUE on success or FALSE on failure.
Examples
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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The above example will output
something similar to: 
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