Magento, can't display getSku() on success page - php

Question

I'm trying to echo getSku() on the success page, but it returns 0. I can use getGrandTotal() or getId(), but I can't get getSku() to work. Any ideas?
The code:
$customer_email = Mage::getSingleton('customer/session')->getCustomer()->getEmail();
$collection = Mage::getModel('sales/order')
->getCollection()
->getItemsCollection()
->addFieldToFilter('status', 'pending_payment')
->addAttributeToFilter('customer_email',array('like'=>$customer_email));
foreach($collection as $order){
//do something
//echo round($order->getGrandTotal(),2) . " ";
$sum += $order->getSku();
} echo $sum;

Answer 1

This is because the full product isn't being loaded. The following code should do the trick for you:
foreach($collection as $order){
// load the product from the ID
$product = Mage::getModel('catalog/product')->load($order->getProductId());
//do something
//echo round($order->getGrandTotal(),2) . " ";
$sum += $product->getSku();
}
I'm not sure if adding the SKU is what you want to do though as the SKU would usually be alphanumeric? Sorry if I've misunderstood!

Answer 2

so you can load that product using that id and then get sku as well.
$productModel = Mage::getModel('catalog/product')->load($id);
echo $productModel->getSku();
don't forget to like my answer if it was helpful

Answer 3

Don't do what the other questions are suggesting, loading models in loops is bad an should be avoided at all cost. Neither should you call getItemsCollection inside your loop.
Your current code doesn't even run, because there is no method called getItemsCollection inside an order collection. That's part of the order object.
Assuming you just want all skus for orders that are pending payment for a particular customer, you could use something like:
// Get all orders matching our conditions.
$orderCollection = Mage::getModel('sales/order')->getCollection()
->addFieldToFilter('status', 'pending_payment')
->addFieldToFilter('customer_email', array('like' => $customer_email));
// Get all items associated with those orders.
$itemCollection = Mage::getModel('sales/order_item')->getCollection()
->addFieldToFilter('order_id', array('in' => $orderCollection->getAllIds()));
// Now do whatever you want with your order item.
foreach ($itemCollection as $item) {
var_dump($item->getSku());
}

Answer 4

Load order by using session on success.phtml
$lastOrderId = Mage::getSingleton('checkout/session')->getLastOrderId();
Now load order
$order = Mage::getModel('sales/order');
$order->load($lastOrderId);
ordered_items = $order->getAllItems();
foreach($ordered_items as $item){
//item detail
echo $item->getItemId(); //product id
echo $item->getSku();
echo $item->getQtyOrdered();
//ordered qty of item
echo $item->getName();
// etc.
}