Framework.php

<?php
    /**
     * Load environment variables from file and init them
     *
     * @throws \Exception
     */
    private function initEnvironmentVars()
    {
        $containerBuilder = new ContainerBuilder();
        $fileLocator = new FileLocator(__DIR__ . '/../../');
        $yamlFileLoader = new YamlFileLoader($containerBuilder, $fileLocator);

        try {
            $yamlFileLoader->load('.env.yml');
        } catch (InvalidArgumentException $e) {
            die('Invalid yaml file structure.');
        } catch (\Exception $e) {
            die('.env.yml file not found. Application cannot start.');
        }
        $containerBuilder->compile();
        $parameterBag = $containerBuilder->getParameterBag();

        foreach ($parameterBag->all() as $key => $value) {
            putenv("$key=$value");
        }
    }

index.php

<?php
$loader = require __DIR__ . '/../vendor/autoload.php';

// ILFW entry point
use App\Container;
use App\Router;
use Symfony\Component\HttpFoundation\Request;

session_start();

$container = new Container();
$container->init('app');
$container->setParameter('routes', (new Router())->getRouteCollection());

$request = Request::createFromGlobals();
$response = $container->get('framework')->handle($request);

$response->send();