Webiny\Component\Http\Session::init PHP Method

    protected function init()
    {
        $config = self::getConfig();
        // validate that headers have not already been sent
        if (headers_sent()) {
            throw new SessionException('Unable to register session handler because headers have already been sent.');
        }
        // remove any shut down functions
        session_register_shutdown();
        // get the driver
        $saveHandler = $config->get('Storage.Driver', '\\Webiny\\Component\\Http\\Session\\Storage\\NativeStorage');
        try {
            // try to create driver instance
            $saveHandler = new $saveHandler($config);
            // register driver as session handler
            session_set_save_handler($saveHandler, false);
            // start the session
            if (session_status() == PHP_SESSION_NONE) {
                session_start();
            }
            // get session id
            $this->sessionId = session_id();
            // save current session locally
            $this->sessionBag = $this->arr($_SESSION);
        } catch (\Exception $e) {
            throw new SessionException($e->getMessage());
        }
    }