本文實例講述了Yii使用Captcha驗證碼的方法。分享給大家供大家參考，具體如下：
詳細代碼可參考:yii自帶的示例代碼post項目，里面有一個contact表單用到了驗證碼.
1. Model:
將驗證碼加入UserLogin的一個屬性:
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控制器加入映射動作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'];//在此核對驗證碼 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 {//提示錯誤 $model->addError('verifyCode','驗證碼不對'); } } // display the login form $this->render('/user/login',array('model'=>$model)); } else $this->redirect(Yii::app()->controller->module->returnUrl);} 在驗證用戶名密碼前，檢查驗證碼：
if($this->createAction('captcha')->validate($model->verifyCode, false)){ 3. view
在視圖中顯示驗證碼圖片,輸入框
<?php $this->widget('CCaptcha'); ?> <?php echo CHtml::activeTextField($model,'verifyCode',array('tabindex'=>1)); ?><img src="http://www.XXXX.net/uploads/123456.jpg" alt=""> 希望本文所述對大家基于Yii框架的PHP程序設計有所幫助。
