Pimcore\Controller\Action\Admin\Document::removeFromSessionAction PHP Метод

    public function removeFromSessionAction()
    {
        $key = "document_" . $this->getParam("id");
        Session::useSession(function ($session) use($key) {
            $session->{$key} = null;
        }, "pimcore_documents");
        $this->_helper->json(["success" => true]);
    }