public function saveProdutoFornecedores($arr, $id_item_referencia)
 {
     $r = httpRequest::get(array('url' => $this->ps_shop_path . 'api/produto_fornecedores/' . $id_item_referencia, 'CURLOPT_USERPWD' => $this->ps_shop_path));
     if ($r->info['http_code'] != 200) {
         return false;
     }
     $suppliers = $r->response;
     foreach ($arr as $value) {
         $find = findINObj('id_supplier', $value, $suppliers);
         if ($find == false) {
             $xml = $this->webService->get(array('url' => $this->ps_shop_path . '/api/product_suppliers?schema=blank'));
             $resources = $xml->children()->children();
             $resources->id_product = $id_item_referencia;
             $resources->id_supplier = $value;
             $resources->id_product_attribute = 0;
             try {
                 $opt = array('resource' => 'product_suppliers');
                 $opt['postXml'] = $xml->asXML();
                 $xml = $this->webService->add($opt);
             } catch (PrestaShopWebserviceException $e) {
                 return json_encode(array('status' => false, 'id_fornecedor' => $value, 'errors' => $this->webService->response->errors));
             }
         }
     }
     foreach ($suppliers as $value) {
         if (!in_array($value->id_supplier, $arr)) {
             try {
                 $opt = array('resource' => 'product_suppliers');
                 $opt['id'] = $value->id_product_supplier;
                 $xml = $this->webService->delete($opt);
             } catch (PrestaShopWebserviceException $e) {
                 return json_encode(array('status' => false, 'id_fornecedor' => $value, 'errors' => $this->webService->response->errors));
             }
         }
     }
 }