Adding CAPTCHA

Nowadays, on the Internet, if you leave a form without a spam protection, you will get a ton of spam data entered in a short time. Yii includes a CAPTCHA component that makes adding such a protection a breeze. The only problem is that there is no systematic guide on how to use it.

In the following example, we will add a CAPTCHA protection to a simple form.

Getting ready

1. Create a fresh application using yiic webapp.

2. Create a form model named protected/models/EmailForm.php as follows:

   <?php
   class EmailForm extends CFormModel
   {
      public $email;
   
      function rules(){
           return array(
             array('email', 'email'),
           );
       }
   }

3. Create a controller named protected/controllers/EmailController.php as follows:

   <?php
   class EmailController extends Controller
   {
      public function actionIndex()
      {
         $success = false;
   
         $model = new EmailForm();
         if(!empty($_POST['EmailForm']))
         {
            $model->setAttributes($_POST['EmailForm']);
            if($model...