Admin_DocumentController::versionToSessionAction PHP Method

    public function versionToSessionAction()
    {
        $version = Version::getById($this->getParam("id"));
        $document = $version->loadData();
        Session::useSession(function ($session) use($document) {
            $key = "document_" . $document->getId();
            $session->{$key} = $document;
        }, "pimcore_documents");
        $this->removeViewRenderer();
    }