Using .env variables in Twig using custom Twig Extension

AppExtension.php

<?php

//src/Twig/AppExtension.php

namespace App\Twig;

use Twig\Extension\AbstractExtension;
use Twig\TwigFunction;

class AppExtension extends AbstractExtension
{
    public function getFunctions(): array
    {
        return [
            new TwigFunction('env', [$this, 'env']),
        ];
    }

    public function env($variable)
    {
        return $_ENV[$variable];
    }
}