code: public static function toArray($obj)
      {
          if ($obj instanceof \DOMNode) {
              $obj = simplexml_import_dom($obj);
          }
          if (!($obj instanceof \SimpleXMLElement)) {
              throw new \RuntimeException(Tools::poorManTranslate('fts-shared', 'The input is not instance of SimpleXMLElement, DOMDocument or DOMNode.'));
          }
          $result = [];
          $namespaces = array_merge(['' => ''], $obj->getNamespaces(true));
          self::_toArray($obj, $result, '', array_keys($namespaces));
  
          return $result;
      }
docs: Returns this XML structure as a array.
  
  @param \SimpleXMLElement|\DOMDocument|\DOMNode $obj SimpleXMLElement, DOMDocument or DOMNode instance
  @return array Array representation of the XML structure.
  @throws \RuntimeException