index.php

<?php

use App\Kernel;
use Symfony\Component\Debug\Debug;
use Symfony\Component\Dotenv\Dotenv;
use Symfony\Component\HttpFoundation\Request;

require __DIR__.'/../vendor/autoload.php';

// The check is to ensure we don't use .env in production
if (!isset($_SERVER['APP_ENV'])) {
    if (!class_exists(Dotenv::class)) {
        throw new \RuntimeException(
            'APP_ENV environment variable is not defined. You need to define '.
            'environment variables for configuration or add "symfony/dotenv" '.
            'as a Composer dependency to load variables from a .env file.'
        );
    }

    (new Dotenv())->load(__DIR__.'/../.env');
}

$env = $_SERVER['APP_ENV'] ?? 'dev';
$debug = $_SERVER['APP_DEBUG'] ?? ('prod' !== $env);

if ($debug) {
    umask(0000);

    Debug::enable();
} else {
    /* @noinspection PhpIncludeInspection */
    @include __DIR__.'/../var/maintenance.php';
}

if ($trustedProxies = $_SERVER['TRUSTED_PROXIES'] ?? false) {
    Request::setTrustedProxies(
        explode(',', $trustedProxies),
        Request::HEADER_X_FORWARDED_ALL ^ Request::HEADER_X_FORWARDED_HOST
    );
}

if ($trustedHosts = $_SERVER['TRUSTED_HOSTS'] ?? false) {
    Request::setTrustedHosts(explode(',', $trustedHosts));
}

$kernel = new Kernel($env, $debug);
$request = Request::createFromGlobals();
$response = $kernel->handle($request);
$response->send();
$kernel->terminate($request, $response);