CakePHP : problems with controllers functions in external php files

Hi guys ! This is my situation:
 
1) a simple_php.php file in webroot folder
2) the users_controller.php in the app/controllers
3) the follow function in the users_controller.php :
 
link

<code>

<?
function login_flat($user_id){
 
        $user_data = $this->User->find('first', array('conditions' => array('User.id' => $user_id)));
   
        if($this->Auth->login($user_data)){
   
        $this->Cookie->write('User.id', $this->Auth->user('id'), true, '+2 hour');
                                                               
        $this->Session->setFlash(__('Welcome back !', true), 'default', array('class' => 'success'));
   
        $this->redirect(array('controller' => 'posts', 'action'=>'index'));
                                exit();
    }
    else{
            echo 'ERROR!!';
            exit();
    }
}  
?>

</code>
 

 
(simple function to login user. NOTE : I know it's not safe , but it's for test only)
 
Now, If I call via browser the function ( eg. www.mysite.com/users/flat_login/13 ) it WORKS ! but ...
 
I need to call it via an other file, the simple_php.php located in the webroot of my domain.
 
I try with the php "header" function. It "call" (redirect) to the flat_login function , but the login not work !!! :(
 
Have any suggestion ? thx in advance.
 
 
P.S.
I'm using cakephp 1.2.6

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