After adding parent::initialize();, an error is reported

Question

protected function _initialize(){

parent::initialize();//Inherit the initialization operation in the parent class

define('USER_ID', Session::get('user_id '));

}

In the Base controller, an error is reported after adding parent::initialize();. Why is this?

Answer 1

protected function _initialize(){

parent::_initialize();    //修改这里

define('USER_ID', Session::get('user_id'));

}

Answer 2

Is there a parent class?