<?php
declare(strict_types=1);

$image = imagecreatetruecolor(8, 6);
$border = imagecolorallocate($image, 255, 255, 255);
$red = imagecolorallocate($image, 255, 0, 0);
imagerectangle($image, 1, 1, 6, 4, $border);
imagefilltoborder($image, 2, 2, $border, $red);
$pixel = imagecolorsforindex($image, imagecolorat($image, 0, 0));
echo $pixel["red"], ",", $pixel["green"], ",", $pixel["blue"], "\n";
