How to use a function of a controller from another controller

Hi all,

There's a controller:

class PhotosController extends AppController {
var $name = 'Photos';

function index()
{
// I need to call the method getAllUsers() of the Users
Controller here.
}
}

================================================
And, there's another controller.

class UsersController extends AppController {
var $name = 'Users';

function index()
{

}

function getAllUsers($userid)
{
// get the array for all the users from the database
and return the same.
}
}

===============================================

Can anybody tell me how can this be done. I tried searching on the
internet, where people say that there are 2 ways of doing this.

===============================================
1. App::import('Controller', 'Posts');

class CommentsController extends AppController {
//Instantiation
$Posts = new PostsController;
//Load model, components...
$Posts->constructClasses();

function index($passArray = array(1,2,3)) {
//Call a method from PostsController with parameter
$Posts->doSomething($passArray);
}
}
===============================================
2. Making it a model.

===============================================

I get an error trying the first alternative. And I dont want to make
the function in the model. Let me know how can we do this.

regards,
Rishab

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