yii\twig\ViewRenderer::render PHP Method

    public function render($view, $file, $params)
    {
        $this->twig->addGlobal('this', $view);
        $loader = new \Twig_Loader_Filesystem(dirname($file));
        if ($view instanceof View) {
            $this->addFallbackPaths($loader, $view->theme);
        }
        $this->addAliases($loader, Yii::$aliases);
        $this->twig->setLoader($loader);
        return $this->twig->render(pathinfo($file, PATHINFO_BASENAME), $params);
    }

 public function run()
 {
     Url::remember('', $this->generateKey());
     // create temporary file
     $model = $this->_model;
     $twigCode = $model ? $model->value : null;
     $tmpFile = \Yii::getAlias('@runtime') . '/' . md5($twigCode);
     file_put_contents($tmpFile, $twigCode);
     $render = new ViewRenderer();
     try {
         $html = $render->render('renderer.twig', $tmpFile, []);
     } catch (\Twig_Error $e) {
         \Yii::$app->session->addFlash('warning', $e->getMessage());
         $html = '';
     }
     if (\Yii::$app->user->can(self::ACCESS_ROLE)) {
         $link = Html::a('prototype module', $model ? $this->generateEditRoute($model->id) : $this->generateCreateRoute());
         if ($this->enableFlash) {
             \Yii::$app->session->addFlash($html ? 'success' : 'info', "Edit contents in {$link}, key: <code>{$this->generateKey()}</code>");
         }
         if (!$model && $this->renderEmpty) {
             $html = $this->renderEmpty();
         }
     }
     \Yii::trace('Twig widget rendered', __METHOD__);
     return $html;
 }