<?php

use Imagine\Gd\Imagine;
use Imagine\Filter\Advanced\OnPixelBased;
use Imagine\Image\ImageInterface;
use Imagine\Image\PointInterface;

$imgPath = 'php_logo.png';

$imagine = new Imagine();
$image = $imagine->open($imgPath);

$colorList = [];

$function = function (ImageInterface $image, PointInterface $point) use (&$colorList) {
    $color = $image->getColorAt($point);
    $colorList[] = (string) $color;
};

$onPixelBased = new OnPixelBased($function);
$onPixelBased->apply($image);

$original = base64_encode($image->get('png'));

echo 'image:<br><img src="data:image/png;base64,' . $original . '">' . PHP_EOL;

// a slice of all the colors:
dump(
    array_slice(
        array_unique($colorList),
        0,
        20
    )
);


image:

^ array:20 [

  0 => "#ffffff"

  1 => "#0000ff"

  2 => "#0e19ea"

  3 => "#474a90"

  4 => "#4b5b74"

  5 => "#535cc1"

  6 => "#4c6c85"

  7 => "#50567f"

  8 => "#6c7aab"

  9 => "#727ea7"

  10 => "#7480a3"

  11 => "#7377af"

  12 => "#3335b5"

  13 => "#8d91c7"

  14 => "#9192ae"

  15 => "#888ead"

  16 => "#8c8ba3"

  17 => "#9396b5"

  18 => "#9fa6cb"

  19 => "#a1a8d0"

]

• Create your own operator in Twig
• Create a json schema to validate against
• ProxyManager: Null Object proxy

PHP 8.2, Laminas MVC 3.2, Symfony 5.2, Laravel 8.28, PHPUnit 9.5, Doctrine ORM 2.8