Yaf_Controller_Abstract::redirect

<?php
class AccountController extends Yaf_Controller_Abstract
{
    public function loginAction() {
        if (!$this->getRequest()->getParam("user")) {
            // send a Location header with HTTP status 302
            $this->redirect("http://www.example.com/account/login/");
            return false; // skip auto-rendering
        }
    }
}
?>