创建类自动加载器的实例

I have class autoloader and if i call $class = new myClass, everything is ok, class loaded, instance created.

I want to create instance of class like this $this->className->myMethod($args);` first create class className and call className's method myMethod?

Is it possible? Can someone post me example, please? Opencart script call modules like this $this->model_catalog_category->getCategory($category_id).