本文实例讲述了Yii使用Captcha验证码的方法。分享给大家供大家参考，具体如下：
详细代码可参考:yii自带的示例代码post项目，里面有一个contact表单用到了验证码.
1. Model:
将验证码加入UserLogin的一个属性:
!CCaptcha::checkRequirements()),);
}
/**
* Declares attribute labels.
*/
public function attributeLabels()
{
return array(
'rememberMe'=>Yii::t('user',"Remember me next time"),'username'=>Yii::t('user',"username or email"),'password'=>Yii::t('user',"password"),'verifyCode'=>Yii::t('user','Verification Code'),);
}
}
2. Controller
在LoginController控制器加入映射动作CCaptchaAction
array(
'class'=>'CCaptchaAction','backColor'=>0xf4f4f4,'padding'=>0,'height'=>30,'maxLength'=>4,),);
}
ublic function actionLogin()
{
if (Yii::app()->user->isGuest) {
$model=new UserLogin;
// collect user input data
if(isset($_POST['UserLogin']))
{
$model->attributes=$_POST['UserLogin'];
//在此核对验证码
if($this->createAction('captcha')->validate($model->verifyCode,false))
{
// validate user input and redirect to prevIoUs page if valid
if($model->validate()) {
//admin login only
if( Yii::app()->getModule('user')->isAdmin()==1 )
{
$this->lastViset();
if (strpos(Yii::app()->user->returnUrl,'/index.PHP')!==false)
$this->redirect(Yii::app()->controller->module->returnUrl);
else
$this->redirect(Yii::app()->user->returnUrl);
}else
{//if no admin when login out
$this->redirect(Yii::app()->controller->module->logoutUrl);
}
}
}else
{//提示错误
$model->addError('verifyCode','验证码不对');
}
}
// display the login form
$this->render('/user/login',array('model'=>$model));
} else
$this->redirect(Yii::app()->controller->module->returnUrl);
}
在验证用户名密码前，检查验证码：
createAction('captcha')->validate($model->verifyCode,false))
{
3. view
PHP;">
widget('CCaptcha'); ?>
1)); ?>
希望本文所述对大家基于Yii框架的PHP程序设计有所帮助。
