I encountered an error when outputting html files using php

Question

Fatal error: Call to undefined method Home::index2.html() in D:\qiangjunwang\core\App.php on line 13

equire_once'/application/controller/'.$controller.'.php';
//1、实例化控制器
$class=new $controller;
$class->$action();

Answer 1

Shouldn’t it be require_once

Answer 2

Prompt that this method is not defined