code: public function renderInclude($name, $path = null)
      {
          if (!isset($this->view)) {
              throw new ViewException('Please Define view engine in app/View.php', 500);
          }
  
          if (!is_null($this->dir)) {
              $this->view->setTemplateDir($this->dir);
          }
  
          return $this->view->renderInclude($name, $path);
      }
docs: File including
  
  @param string $name
  @param null   $path
  
  @return mixed