Get item from order id

Question

My order #100000010 has 3 items. But when I used this code, it did not echo anything. Where is my mistake

<?php   
$id_order = 100000010;
$order = Mage::getModel('sales/order')->load($id_order);
$items = $order->getAllItems();
foreach($items as $i):
  echo $_product = Mage::getModel('catalog/product')
            ->load($i->getProductId())->getSku();
endforeach;?>

Answer 1

Hi 100000010 is order increment id.it is not order id.. So need to change

to

$order = Mage::getModel('sales/order')->loadByIncrementId($id_order)

from

$order = Mage::getModel('sales/order')->load($id_order);

Answer 2

The long number is the order's increment_id, which is different from its entity_id (which is what load() expects).

Use loadByIncrementId() to load by increment ID:

$order = Mage::getModel('sales/order')->loadByIncrementId($id_order);