PubIdPlugin::clearIssueObjectsPubIds PHP Method

    function clearIssueObjectsPubIds($issue)
    {
        $issueId = $issue->getId();
        $submissionPubIdEnabled = $this->isObjectTypeEnabled('Submission', $issue->getJournalId());
        $representationPubIdEnabled = $this->isObjectTypeEnabled('Representation', $issue->getJournalId());
        $filePubIdEnabled = $this->isObjectTypeEnabled('SubmissionFile', $issue->getJournalId());
        if (!$submissionPubIdEnabled && !$representationPubIdEnabled && !$filePubIdEnabled) {
            return false;
        }
        $pubIdType = $this->getPubIdType();
        $publishedArticleDao = DAORegistry::getDAO('PublishedArticleDAO');
        $representationDao = Application::getRepresentationDAO();
        $submissionFileDao = DAORegistry::getDAO('SubmissionFileDAO');
        import('lib.pkp.classes.submission.SubmissionFile');
        // SUBMISSION_FILE_... constants
        $publishedArticles = $publishedArticleDao->getPublishedArticles($issueId);
        foreach ($publishedArticles as $publishedArticle) {
            if ($submissionPubIdEnabled) {
                // Does this option have to be enabled here for?
                $publishedArticleDao->deletePubId($publishedArticle->getId(), $pubIdType);
            }
            if ($representationPubIdEnabled || $filePubIdEnabled) {
                // Does this option have to be enabled here for?
                $representations = $representationDao->getBySubmissionId($publishedArticle->getId());
                while ($representation = $representations->next()) {
                    if ($representationPubIdEnabled) {
                        // Does this option have to be enabled here for?
                        $representationDao->deletePubId($representation->getId(), $pubIdType);
                    }
                    if ($filePubIdEnabled) {
                        // Does this option have to be enabled here for?
                        $articleProofFiles = $submissionFileDao->getAllRevisionsByAssocId(ASSOC_TYPE_REPRESENTATION, $representation->getId(), SUBMISSION_FILE_PROOF);
                        foreach ($articleProofFiles as $articleProofFile) {
                            $submissionFileDao->deletePubId($articleProofFile->getFileId(), $pubIdType);
                        }
                    }
                }
                unset($representations);
            }
        }
    }