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Yaf_Controller_Abstract::redirect() is a method in the PHP Yaf framework that is used to redirect the user to a different URL.

Here's how you can use it:

php
$this->redirect($url);


In this code, $url is the URL where you want to redirect the user.

For example, if you want to redirect the user to the homepage of your website, you can use:

php
$this->redirect('/');


If you want to redirect the user to another controller and action, you can use:

php
$this->redirect('/controller/action');


You can also specify additional query parameters when redirecting by passing them in an associative array as the second parameter:

php
$this->redirect('/controller/action', ['param1' => 'value1', 'param2' => 'value2']);


This will append the query string to the redirected URL.

I hope this explanation helps! Let me know if you have any further questions.