<?php
declare(strict_types=1);

$source = imagecreatetruecolor(4, 4);
imagefill($source, 0, 0, imagecolorallocate($source, 255, 0, 0));
$image = imagecreatetruecolor(8, 6);
imagecopymerge($image, $source, 2, 1, 0, 0, 4, 4, 100);
$pixel = imagecolorsforindex($image, imagecolorat($image, 3, 2));
echo $pixel["red"], ",", $pixel["green"], ",", $pixel["blue"], "\n";
$pixel = imagecolorsforindex($image, imagecolorat($image, 0, 0));
echo $pixel["red"], ",", $pixel["green"], ",", $pixel["blue"], "\n";
