<?php
declare(strict_types=1);

$image = imagecreatetruecolor(2, 2);
imagealphablending($image, false);
imagesavealpha($image, true);
$color = imagecolorallocatealpha($image, 255, 0, 0, 64);
imagesetpixel($image, 0, 0, $color);
echo imagecolorsforindex($image, imagecolorat($image, 0, 0))["alpha"], "\n";
