WeberDev.com -> PHP Manual -> Flood fill to specific color

Description

bool imagefilltoborder ( resource $image , int $x , int $y , int $border , int $color )

imagefilltoborder() performs a flood fill whose border color is defined by border . The starting point for the fill is x , y (top left is 0, 0) and the region is filled with color color .

Parameters

image: An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
x: x-coordinate of start.
y: y-coordinate of start.
border: The border color. A color identifier created with imagecolorallocate().
color: The fill color. A color identifier created with imagecolorallocate().

Return Values

Returns TRUE on success or FALSE on failure.

Examples

Example #1 Filling an ellipse with a color

 <?php
// Create the image handle, set the background to white
$im = imagecreatetruecolor(100, 100);
imagefilledrectangle($im, 0, 0, 100, 100, imagecolorallocate($im, 255, 255, 255));

// Draw an ellipse to fill with a black border
imageellipse($im, 50, 50, 50, 50, imagecolorallocate($im, 0, 0, 0));

// Set the border and fill colors
$border = imagecolorallocate($im, 0, 0, 0);
$fill = imagecolorallocate($im, 255, 0, 0);

// Fill the selection
imagefilltoborder($im, 50, 50, $border, $fill);

// Output and free memory
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);
?>

The above example will output something similar to: