(PHP 4, PHP 5, PHP 7)
imagefilltoborder — Flood fill to specific color
$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.
  
imageAn image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
xx-coordinate of start.
yy-coordinate of start.
borderThe border color. A color identifier created with imagecolorallocate().
colorThe fill color. A color identifier created with imagecolorallocate().
   Returns TRUE on success or FALSE on failure.
  
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:
