yii 验证码的使用

  public function actions(){

        return array(
            // captcha action renders the CAPTCHA image displayed on the contact page
            ‘captcha‘=>array(
                ‘class‘=>‘CCaptchaAction‘,
                ‘backColor‘=>0xFFFFFF,  //背景颜色
                ‘minLength‘=>4,  //最短为4位
                ‘maxLength‘=>4,   //是长为4位
                ‘transparent‘=>true,  //显示为透明
            ),
        );
    }

　public function actionIndex(){
　　　　$this->layout = false;
　　　　$this->render(‘index‘);
　}