Hello Yii friends I am going to write an article. ThatMany times we write asame code on every ajax call, but writing a single code in one controller is sufficient in ajax post with csrf security which is very easy. At first go to components and open the controller.php Simply add the following code:-
 
 
```php 
// this function will be initialize in every controller call which will call initAjaxCsrfToken function
 
 
public function init() { parent::init(); $this->initAjaxCsrfToken(); }     // this function will work to post csrf token.
 
protected function initAjaxCsrfToken() {

Yii::app()->clientScript->registerScript('AjaxCsrfToken', ' $.ajaxSetup({cache:false
});', CClientScript::POS_HEAD);
}
 
```
Enjoy coding