Adding Captcha

Just learned how to add captcha to a form using Yii framework. Followed the steps specified in the Yii Book, but was not working and needed a special configuration [found in a forum post].  Here is how you add a Captcha to existing form :

Model

Add a field in the form (model) which is used to verify the captcha code

<?php
class User extends CActiveRecord {
public $verifyCode;

//other fields

public function rules() {

return array(

//my other rules

array('verifyCode', 'captcha', 'allowEmpty' => ! CCaptcha::checkRequirements()),

);

}

public function attributeLabels() {

return array(

//my other element's labels

'verifyCode' => 'Enter the text in image'

);

}

}

View

<div class="row">
 <p>
   <?php echo CHtml::activeLabelEx($model, 'verifyCode'); ?>
   <?php $this->widget('CCaptcha'); ?>
 </p>
 <p>
   <?php echo CHtml::activeTextField($model, 'verifyCode'); ?>
   <?php echo CHtml::error($model, 'verifyCode'); ?>
 </p>
 </div>

Controller

public class UserController extends CController {

public function actions() {
return array ('captcha' => array('class' => 'CCaptchaAction', 'backColor' => 0xFFFFFF));
}

public function accessRules() {
return array(
array('allow', // allow all users to perform 'index' and 'view' actions
'actions'=>array('register', 'index','view', 'login', 'captcha'), 'users'=>array('*'),
),

// other rules

);

}

}

References :

http://www.yiiframework.com/forum/index.php?/topic/23660-yii-captcha-doesnt-work/