Yii2框架中如何动态增加对相同顶级域名跨域的支持？

/**

     * @inheritdoc

     */

    public function behaviors()

    {

        $tempu = parse_url(Yii::$app->request->getReferrer());

        $host = ArrayHelper::getValue($tempu, 'scheme')."://".ArrayHelper::getValue($tempu, 'host');

        if(substr($host,-11) == ".zkbhj.com"){

            $host_arr = [$host];

        }else{

            $host_arr = ["http://www.zkbhj.com"];

        }

        if (YII_DEBUG) {

            $host_arr = ['*'];

        }

        return [

            'corsFilter' => [

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

                'cors' => [

                    'Origin' => $host_arr,

                    'Access-Control-Allow-Credentials' => true,

                ]

            ],

        ];

    }