yii处理cookie

/**
     * 设置用户cookie会话
     */
    public function setCookie() {

        //set loginName
        $cookies  = Yii::app()->request->cookies['username'];
        if ( !($cookies instanceof CHttpCookie) || $cookies->value!=Yii::app()->request->getPost('loginName') ) {
            $CookieUserName         = new CHttpCookie( 'username', Yii::app()->request->getPost('loginName') );
            $CookieUserName->domain = DOMAIN;
            $CookieUserName->expire = strtotime( '+7 day', time() );
            Yii::app()->request->cookies->add( 'username', $CookieUserName );
        }
    }