Backup\Model\Content::createDocument PHP Метод

    public function createDocument()
    {
        $documents = new Document\Collection();
        $rows = $documents->fetchAll($documents->select(function ($select) {
            $select->order('sort_order ASC');
            $select->order('created_at ASC');
        }));
        if (empty($rows)) {
            return '';
        }
        $documentArray = array();
        foreach ($rows as $row) {
            $documentArray[] = Document\Model::fromArray((array) $row);
        }
        $propertiyCollection = new Property\Collection();
        foreach ($documentArray as $document) {
            $array = array();
            $properties = $propertiyCollection->load(null, null, $document->getId())->getProperties();
            foreach ($properties as $property) {
                $value = $property->getValueModel()->getValue();
                $property->getValueModel()->setValue(base64_encode($value));
                $array[] = $property->getValueModel();
            }
            $document->setProperties($array);
        }
        return $documents->toXml($documentArray, 'documents');
    }