找不到空名

Question

完全可以理解，找不到“xxx”类。

但是我在下面粘贴了一个空的className，发生在一个简单的REST身份验证的上下文中

PHP Fatal Error
Class '' not found

yii\base\ErrorException
/home/genie/yii-app/vendor/yiisoft/yii2/rest/IndexAction.php

下面的一些代码，但为什么那个人抛出一个像这样的空类名????

处理登录的控制器（用户模型实现identityInterface：

<?php
namespace api\controllers;
use yii;
use yii\rest\ActiveController;
use common\models\User;

class RestController extends ActiveController
{

	public $modelClass = '';
	// public $modelClass = 'common\models\User';

	public function behaviors()
	{
	$behaviors = parent::behaviors();
	$behaviors['verbs'] = [
	'class' => \yii\filters\VerbFilter::className(),
	'actions' => [
	'index' => ['get', 'head'],
	],
	];

	$behaviors['access'] = [
    'class' => \yii\filters\AccessControl::className(),
    'only' => ['index'],
    'rules' => [
        [
            'actions' => ['index'],
            'allow' => true,
            'roles' => ['@'],
        ],
    ],
];




$behaviors['authenticator'] = [

	'class' => \yii\filters\auth\HttpBasicAuth::className(),

	'auth' => function ($username, $password) {

	    $user = \common\models\User::findByUsername($username);

	    if ($user ) {


			$pass = \common\models\User::validatePassword($password);

			if($pass)
				return $user;

	    }

	}

];

	return $behaviors;
	}



}