Method _setImageOrdering

protected function _setImageOrdering()
{
    if (empty($this->_imgordering)) {
        $app = Factory::getApplication();
        $paramsC = ComponentHelper::getParams('com_phocagallery');
        $image_ordering = $paramsC->get('image_ordering', 1);
        $this->_imgordering = PhocaGalleryOrdering::getOrderingString($app->getUserStateFromRequest('com_phocagallery.category.' . 'imgordering', 'imgordering', $image_ordering, 'int'));
    }
    return true;
}