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:
class UserLogin extends CFormModel
{
public $username;
public $password;
public $rememberMe;
public $verifyCode;
public function rules()
{
return array(
// username and password are required
array('username, password,verifyCode', 'required'),
// rememberMe needs to be a boolean
array('rememberMe', 'boolean'),
// password needs to be authenticated
array('password', 'authenticate'),
// verifyCode needs to be entered correctly
array('verifyCode', 'captcha', 'allowEmpty'=>!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
public function actions()
{
return array(
// captcha action renders the CAPTCHA image displayed on the contact page
'captcha'=>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
$this->redirect(Yii::app()->controller->module->returnUrl);
}
在验证用户名密码前，检查验证码：
if($this->createAction('captcha')->validate($model->verifyCode, false))
{
3. view
在视图中显示验证码图片,输入框
<?php $this->widget('CCaptcha'); ?>
<?php echo CHtml::activeTextField($model,'verifyCode',array('tabindex'=>1)); ?>
<img src="http://www.XXXX.net/uploads/123456.jpg" alt="">
希望本文所述对大家基于Yii框架的PHP程序设计有所帮助。