Add SKU to end of Magento URL - magento

Question

I have searched for days trying to find a way of doing this but cannot find an answer, hopefully someone here can help me.
Essentially we want to insert the SKU into the product page url
Example
SKU = ST500DM002
So
domain.co.uk/seagate-barracuda-500gb-sata3.html
Would become
domain.co.uk/seagate-barracuda-500gb-sata3-ST500DM002.html
I had a look at this How to customize product URL?
It kind of works but it creates a path like this http://www.domain. co.uk/catalog/product/ST500DM002/seagate-barracuda-500gb-sata3.html rather than add it onto the end
Also we have a lot of SKUs with # in them which causes problems and throws 404
Is there a way to programmatically add the SKU and strip out #
Thanks

Answer 1

Copy the code and paste it to the file "script.php" and move it to magento root folder and try to run it in browser by using the following url,
http://localhost.com/script.php
<?php
require 'app/Mage.php';
Mage::app();
$amount = 0;
$model = Mage::getModel('catalog/product');
$products = $model->getCollection();
foreach ($products as $product) {
$model->load($product->getId());
$urlkey = $product->getUrlKey();
$sku = $product->getSku();
$product->setUrlKey($urlkey."/".$sku)->save();
set_time_limit();
$amount++;
}
When you run the file, All the urls will be rewritten with the new url keys.
You can find updated keys everywhere.

Answer 2

Create observer to catch event catalog_product_save_after_handler
$product = $observer->getProduct();
$urlkey = $product->getUrlKey();
$sku = $product->getSku();
if(substr($urlkey, strlen($sku) * (-1)) != $sku){
$product->setUrlKey($urlkey."/".$sku)->save();
}