<?php
require_once 'app/Mage.php';  
umask(0);  
Mage::app('default');
 
try{
//début du code à tester
$id = 12;
$product = Mage::getModel ( 'catalog/product')->load ( $id );
echo $product->getSku();
}catch (Exception $e){
die($e->getMessage());
}
?>