I've upgraded a Joomla 3.10 website to 4.x. I use custom scripts on the website wich use the framework and that worked fine until after the upgrade.

I did some searching and since the framework got an update i updated the framework and changed the script to reflect the changes. I downloaded the new framework from [GitHub][1] and installed it with composer.

However, i'm just getting a blank page. The code for the script is: 

```php
<?php
ini_set('display_errors', 1);
error_reporting(E_ALL);


define('_JEXEC', 1);
define('JPATH_BASE', __DIR__);

require_once '/home/dfk/domains/dfk.be/public_html/libraries/src/Factory.php';
require_once '/home/dfk/domains/dfk.be/public_html/libraries/src/User/User.php';

// Initialize the application
$app = JFactory::getApplication('site');
$app->initialise();

use Joomla\CMS\Factory;
use Joomla\CMS\User\User;

// Initialize the application
$app = Factory::getApplication('site');
$app->initialise();

$user = User::getInstance();
$userID = $user->id;
$username = $user->username;

echo "UserID:" . $userID;
?>
```

I get no output at all, not even the "UserID:" string. No errors, so very hard to troubleshoot.

I've googled and tried some suggestions and nothing worked. Also tried some ChatGPT suggestions ;), but that didn't help either.


Is there anyone who has any tips on what could be wrong? Thanks in advance.

EDIT:

With the following code that i found in article [https://joomla.stackexchange.com/questions/32641/acess-joomla-framework-from-external-php-file][2] i can retrieve the session data, but i do not know how to use user data with this. Can anyone help me out with this please. There is very little documentation on the current framework, and most is outdated.

```php
<?php

if (!defined('_JEXEC')) define('_JEXEC', 1);
if (!defined('JPATH_BASE')) define('JPATH_BASE', __DIR__);

require_once JPATH_BASE . '/includes/defines.php';
require_once JPATH_BASE . '/includes/framework.php';

// Boot the DI container
$container = \Joomla\CMS\Factory::getContainer();

/*
 * Alias the session service keys to the web session service as that is the primary session backend for this application
 *
 * In addition to aliasing "common" service keys, we also create aliases for the PHP classes to ensure autowiring objects
 * is supported.  This includes aliases for aliased class names, and the keys for aliased class names should be considered
 * deprecated to be removed when the class name alias is removed as well.
 */
$container->alias('session.web', 'session.web.site')
    ->alias('session', 'session.web.site')
    ->alias('JSession', 'session.web.site')
    ->alias(\Joomla\CMS\Session\Session::class, 'session.web.site')
    ->alias(\Joomla\Session\Session::class, 'session.web.site')
    ->alias(\Joomla\Session\SessionInterface::class, 'session.web.site');

// Instantiate the application.
$app = $container->get(\Joomla\CMS\Application\SiteApplication::class);

// Set the application as global app
\Joomla\CMS\Factory::$application = $app;

var_dump($app);
```


  [1]: https://github.com/joomla-framework
  [2]: https://joomla.stackexchange.com/questions/32641/acess-joomla-framework-from-external-php-file