PHP 8.1: how to to retrieve session variables after using session_regenerate_id() in a Slim framework application
I'm sure I'm missing something obvious here, but I'm experiencing an scenario in my Slim PHP application where session variables are not accessible after calling `session_regenerate_id()`... I'm using PHP 8.1 and have the following session configuration in my `settings.php` file: ```php 'settings' => [ 'session' => [ 'name' => 'my_session', 'lifetime' => 3600, 'path' => '/', 'domain' => null, 'secure' => false, 'httponly' => true, ], ], ``` I'm properly starting the session at the beginning of my route handler: ```php $app->get('/login', function (Request $request, Response $response) { session_start(); // Store user information in session $_SESSION['user_id'] = 1; return $response; }); ``` However, after regenerating the session ID, the session variables seem to be lost: ```php $app->post('/login', function (Request $request, Response $response) { session_start(); // Regenerate session ID for security session_regenerate_id(true); // Check if user information is still available if (isset($_SESSION['user_id'])) { return $response->withJson(['status' => 'logged_in']); } else { return $response->withJson(['status' => 'behavior', 'message' => 'Session variable lost after regeneration!']); } }); ``` I have confirmed that this only happens after `session_regenerate_id(true)` is called. The expected behavior is that the session variables should continue, but instead, I'm getting the behavior message indicating that the session variable is not set. I’ve also checked the PHP session save path and permissions, which seem fine. Is there something I am missing in the session management, or is there a known scenario with PHP 8.1 when using session regeneration in Slim? What's the best practice here?