Type cast value objects in twig

When working with value objects, it might make sense to typecast them within a twig template. Out of the box twig doesn't offer typecasting. But it's quite easy to offer it with a custom filter.

Here is an example how the most basic castings would look like:

<?php

declare(strict_types=1);

namespace App\Twig\Extension;

use Twig\Extension\AbstractExtension;
use Twig\TwigFilter;

final class TypeCastingExtension extends AbstractExtension
{
    /** @return array<int, TwigFilter> */
    public function getFilters(): array
    {
        return [
            new TwigFilter('int', function ($value) {
                return (int) $value;
            }),
            new TwigFilter('float', function ($value) {
                return (float) $value;
            }),
            new TwigFilter('string', function ($value) {
                return (string) $value;
            }),
            new TwigFilter('bool', function ($value) {
                return (bool) $value;
            }),
            new TwigFilter('array', function (object $value) {
                return (array) $value;
            }),
            new TwigFilter('object', function (array $value) {
                return (object) $value;
            }),
        ];
    }
}

In a twig template it would be used as any other filter:

Name: {{ user.name | string }}