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

    protected function saveToSession($doc, $useForSave = false)
    {
        // save to session
        Session::useSession(function ($session) use($doc, $useForSave) {
            $session->{"document_" . $doc->getId()} = $doc;
            if ($useForSave) {
                $session->{"document_" . $doc->getId() . "_useForSave"} = true;
            }
        }, "pimcore_documents");
    }