PKPSubmissionFileDAO::getByBestId PHP Method

    function getByBestId($fileId, $submissionId)
    {
        $file = null;
        if ($fileId != '') {
            $file = $this->getByPubId('publisher-id', $fileId, $submissionId);
        }
        if (!isset($file)) {
            list($fileId, $revision) = array_map(create_function('$a', 'return (int) $a;'), preg_split('/-/', $fileId));
            $file = $this->getRevision($fileId, $revision, null, $submissionId);
        }
        if ($file && $file->getFileStage() == SUBMISSION_FILE_PROOF) {
            return $file;
        }
        if ($file && $file->getFileStage() == SUBMISSION_FILE_DEPENDENT) {
            return $file;
        }
        return null;
    }