How to use Yii::app()->end() method and how is it different from exit()?

Question

In form validating,I find such codes

if(isset($_POST['ajax']) && $_POST['ajax']==='login-form')
    {
        echo CActiveForm::validate($model);
        Yii::app()->end();
    }

The manual says that the end() method will terminate the application. Why to terminate the app? The following codes will not execute?

Answer 1

Yes, it's an Ajax request and the code is supposed to return the validation results and then stop code execution. It's the same idea as the Php die function, but allows Yii to run onApplicationEnd cleanup code (if any)