<?php

$colors = [];

$img = function(Callable $rand) use ($colors) {
    $height = 200;
    $width = 200;
    
    $r = imagecreatetruecolor($width, $height);
    
    foreach (range(0, $height) as $y) {
        foreach (range(0, $width) as $x) {
            $c = $rand();
    
            if (!array_key_exists($c, $colors)) {
                $colors[$c] = imagecolorallocate($r, $c, $c, $c);
            }
            
            imagesetpixel($r, $x, $y, $colors[$c]);
        }
    }
    
    ob_start();
    imagepng($r);
    $img = base64_encode(ob_get_contents());
    ob_clean();
    return '<img src="data:image/png;base64,' . $img . '">';
};

$rand = function() {
    // time as seed
    srand((float) microtime() * 100);
    return rand(0, 255);
};

// no so random
echo $img($rand);

• Using RegexIterator to filter values of collection
• The caching part of the CachingIterator
• A calendar written with IntlCalendar class

PHP 8.3, Laminas MVC 3.2, Symfony 5.2, Laravel 8.28, PHPUnit 9.5, Doctrine ORM 2.8