Pimcore\Model\Object\ClassDefinition::cleanupForExport PHP Method

    public static function cleanupForExport(&$data)
    {
        if (isset($data->fieldDefinitionsCache)) {
            unset($data->fieldDefinitionsCache);
        }
        if (method_exists($data, "getChilds")) {
            $children = $data->getChilds();
            if (is_array($children)) {
                foreach ($children as $child) {
                    self::cleanupForExport($child);
                }
            }
        }
    }