I am trying to migrate to the Shopping.com API 3 but am having trouble parsing the XML.

I am using PHP and wanting to use simplexml_load_file() function.

Code:
<? 

$xml = simplexml_load_file("http://sandbox.api.shopping.com/publisher/3.0/rest/GeneralSearch?apiKey=authorized-key&trackingId=7000610&keyword=bosch%20wae28364"); 
 
echo $xml;
foreach($GeneralSearchResponse->offer as $product) {   }
  





?>
This is not working.

What is the best method of parsing this XML feed in PHP?