<?php
declare(strict_types=1);

$image = imagecreate(2, 2);
$index = imagecolorallocate($image, 255, 0, 0);
var_dump(imagecolorset($image, $index, 0, 255, 0));
$pixel = imagecolorsforindex($image, imagecolorat($image, 0, 0));
echo $pixel["red"], ",", $pixel["green"], ",", $pixel["blue"], "\n";
