Gpf_Rpc_Params::exists PHP Method

        public function exists($name)
        {
            if (!is_object($this->params) || !array_key_exists($name, $this->params)) {
                return false;
            }
            return true;
        }

 /**
  * returns available plugins
  *
  * @service plugin read
  * @param $fields
  */
 public function load(Gpf_Rpc_Params $params)
 {
     $availablePlugins = Gpf_Plugins_Engine::getInstance()->getAvailablePlugins();
     if ($params->exists("type")) {
         $type = $params->get("type");
     } else {
         $type = Gpf_Plugins_Definition::PLUGIN_TYPE_NORMAL;
     }
     $response = new Gpf_Data_RecordSet();
     $response->addColumn(Gpf_Plugins_Definition::CODE);
     $response->addColumn(Gpf_Plugins_Definition::NAME);
     $response->addColumn(Gpf_Plugins_Definition::URL);
     $response->addColumn(Gpf_Plugins_Definition::DESCRIPTION);
     $response->addColumn(Gpf_Plugins_Definition::VERSION);
     $response->addColumn(Gpf_Plugins_Definition::AUTHOR);
     $response->addColumn(Gpf_Plugins_Definition::AUTHOR_URL);
     $response->addColumn(Gpf_Plugins_Definition::ACTIVE);
     $response->addColumn(Gpf_Plugins_Definition::HELP);
     $response->addColumn(Gpf_Plugins_Definition::CONFIG_CLASS_NAME);
     foreach ($availablePlugins as $plugin) {
         if ($plugin->getPluginType() == $type) {
             $response->addRecord($plugin->toRecord($response));
         }
     }
     $response = $this->setActivePlugins($response);
     return $response;
 }