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‘);
　}

   <?php $this->widget(‘CCaptcha‘); ?>