yii\widgets\Menu::run PHP Method

    public function run()
    {
        if ($this->route === null && Yii::$app->controller !== null) {
            $this->route = Yii::$app->controller->getRoute();
        }
        if ($this->params === null) {
            $this->params = Yii::$app->request->getQueryParams();
        }
        $items = $this->normalizeItems($this->items, $hasActiveChild);
        if (!empty($items)) {
            $options = $this->options;
            $tag = ArrayHelper::remove($options, 'tag', 'ul');
            echo Html::tag($tag, $this->renderItems($items), $options);
        }
    }

 /**
  * Renders the menu.
  */
 public function run()
 {
     // Get Module list
     $modules = array_keys(Yii::$app->modules);
     // Get sub menu for each module
     foreach ($modules as $moduleName) {
         // Get module
         $moduleObj = Yii::$app->getModule($moduleName);
         $iconClass = isset($moduleObj->iconClass) ? $moduleObj->iconClass : 'fa-dashboard';
         // Get menu
         if (property_exists($moduleObj, 'backendMenu')) {
             $getModule = Yii::$app->request->get('module');
             $item = ['label' => Icon::show($iconClass) . '<span class="nav-label">' . Yii::t($moduleName, ucfirst($moduleName)) . '</span>', 'url' => ['/' . $moduleName . '/default']];
             if (Yii::$app->controller->module->id == $moduleName and empty($getModule) or $getModule == $moduleName) {
                 $item['active'] = TRUE;
             }
             $backendMenu = $moduleObj->backendMenu;
             if (is_array($backendMenu)) {
                 foreach ($backendMenu as $itemMenu) {
                     if (isset($itemMenu['access']) and $this->checkAccess($itemMenu['access'])) {
                         $item['items'][] = ['label' => $itemMenu['label'], 'url' => $itemMenu['url']];
                     }
                 }
                 if (isset($item['items']) and !empty($item['items'])) {
                     $item['label'] .= '<span class="fa arrow"></span>';
                 }
             }
             // assign to $this->items
             $this->items[] = $item;
         }
     }
     parent::run();
 }