<?php

use Twig\Loader\ArrayLoader;
use Twig\Environment;
use Twig\TwigTest;

$test = new TwigTest('bigger_than_zero', static function(float $num) : bool {
    return 0 < $num;
});

$templates = [
    'twigtest' => '{% if number is bigger_than_zero %}true{% else %}false{% endif %}<br>',
];
$loader = new ArrayLoader($templates);
$twig = new Environment($loader);
$twig->addTest($test);

echo $twig->render('twigtest', ['number' => 10]);
echo $twig->render('twigtest', ['number' => -5]);

true
false

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