Ojs\CoreBundle\Params\IssueDisplayModes::getDisplayModes PHP Метод

    public static function getDisplayModes()
    {
        return ['all' => IssueDisplayModes::SHOW_ALL, 'title' => IssueDisplayModes::SHOW_TITLE, 'volumeAndNumber' => IssueDisplayModes::SHOW_VOLUME_AND_NUMBER];
    }

 /**
  * @param Request $request
  * @return Response
  */
 public function recordsAction(Request $request)
 {
     $fileCache = $this->get('file_cache');
     $data = [];
     /** @var \Doctrine\ORM\EntityManager $em */
     $em = $this->getDoctrine()->getManager();
     $from = $request->get('from', false);
     $until = $request->get('until', false);
     $set = $request->get('set', false);
     $qb = $em->createQueryBuilder();
     $qb->select("a")->from("OjsJournalBundle:Article", 'a');
     $qb->andWhere('a.status = ' . ArticleStatuses::STATUS_PUBLISHED);
     if ($from) {
         $_from = new \DateTime();
         $_from->setTimestamp(strtotime($from));
         $qb->where($qb->expr()->gte('a.created', ':from'))->setParameter('from', $_from);
     }
     if ($until) {
         $_until = new \DateTime();
         $_until->setTimestamp(strtotime($until));
         $condition = $qb->expr()->lte('a.created', ':until');
         if ($from) {
             $qb->andWhere($condition);
         } else {
             $qb->where($condition);
         }
         $qb->setParameter('until', $_until);
     }
     $currentPage = 1;
     if ($request->query->has('resumptionToken') && $fileCache->contains($request->get('resumptionToken'))) {
         $token = $fileCache->fetch($request->query->get('resumptionToken'));
         $currentPage = (int) $token['page'];
         $set = $token['set'];
     }
     if ($set) {
         $qb->join('a.journal', 'j', 'WITH');
         $qb->andWhere($qb->expr()->eq('j.slug', ':slug'))->setParameter('slug', $set);
     }
     $paginator = $this->get('knp_paginator');
     $records = $paginator->paginate($qb->getQuery(), $currentPage, 100);
     $data['records'] = $records;
     $key = md5(StringHelper::generateKey());
     $fileCache->save($key, ['page' => $currentPage + 1, 'set' => $set], 60 * 60 * 24);
     $data['resumptionToken'] = $key;
     $data['isLast'] = $records->getTotalItemCount() >= $currentPage * 100 ? true : false;
     $data['currentPage'] = $currentPage;
     $data['metadataPrefix'] = $request->get('metadataPrefix', 'oai_dc');
     $data['displayModes'] = IssueDisplayModes::getDisplayModes();
     return $this->response('OjsOAIBundle:Default:records.xml.twig', $data);
 }