try2 for prestashop

//1) My module is emptystockproducts

//2) my main admin page  : emptystockproducts.php

class EmptyStockProducts extends Module
{
...
//array for display
	public function getEmptyStockProducts($id_lang, $id_category = true)
	{

	 	return $myarray;
	}
}

//3) My display page in the /module/emptystockproducts/
named : displayemptystockproducts.php

<?php
include_once(dirname(__FILE__).'/../../config/config.inc.php');
include_once(dirname(__FILE__).'../../../init.php');
include_once(dirname(__FILE__).'/emptystockproducts.php');

include_once(dirname(__FILE__).'/../../header.php');
global $link, $smarty, $cookie;
$smarty->assign(array(
	'emptystockproducts' => EmptyStockProducts::getEmptyStockProducts((int)($cookie->id_lang), false)
));
$smarty->display(dirname(__FILE__).'/emptystockproducts.tpl');
include_once(dirname(__FILE__).'/../../footer.php');


//4) and in my footer.tpl i set a link to /modules/emptystockproducts/displayemptystockproducts.php

But it doesn't work : i can't access to the class ( fatal error  for EmptyStockProducts::getEmptyStockProducts )