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。