<?php
declare(strict_types=1);

$image = imagecreatetruecolor(4, 2);
$red = imagecolorallocate($image, 255, 0, 0);
imagesetpixel($image, 0, 0, $red);
imageflip($image, IMG_FLIP_HORIZONTAL);
$pixel = imagecolorsforindex($image, imagecolorat($image, 3, 0));
echo $pixel["red"], ",", $pixel["green"], ",", $pixel["blue"], "\n";
