Why does my administrator edit and update successfully, but there is no Ajax prompt?

Question

An error will be reported in TP5 debugging state

Undefined variable: data

public function editUser(Request $request)
{
//Get the data returned by the form
// $data = $request -> param();
$param = $request -> param();

//Remove the empty data in the form, that is, the data that has not been modified Content
      foreach ($param as $key => $value ){
          if (!empty($value)){
                                                                                                 #     }
          $condition = ['id'=>$data['id']] ; ;
                                                                                                                                                      ; ##        Session::set('user_info.role', $data['role']);
      }

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}
}

Answer 1

if($request->param('name')=='admin')
{
Session::set('user_info.role',$data['role']);
}

Change it to this

Answer 2

Define data at the front of the method and assign it to empty