parse ebay xml response

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I am trying to parse the xml structure of the ebay website after implementing their API. I get null values for "categoryId" element and "currentPrice" elements. Please what am I doing wrong. Find my php code below:\[code\]<?php// http get url ***$url =("http://svcs.sandbox.ebay.com/services/search/FindingService/v1?OPERATION-NAME=findItemsByKeywords&SERVICE-VERSION=1.0.0&SECURITY-APPNAME=Linkserv-9a06-4300-982e-769819b827e9&RESPONSE-DATA-FORMAT=XML&REST-PAYLOAD&keywords=shirts&paginationInput.entriesPerPage=20&paginationInput.pageNumber=1");$xml = simplexml_load_file($url);foreach ($xml->searchResult->item as $entry){echo $entry->itemId;echo $entry->title;echo $entry->categoryId;echo $entry->categoryName;echo $entry->viewItemURL;echo $entry->location;echo $entry->currentPrice;// Process XML file// Opens a connection to a PostgresSQL server$connection = pg_connect("dbname=postgres user=postgres password=xxxx");$query = "INSERT INTO ebay(id, title, catid, category, image, location, price) VALUES ('" . $entry->itemId . "', '" . $entry->title . "', '" . $entry->categoryId . "', '" . $entry->categoryName . "', '" . $entry->viewItemURL . "', '" . $entry->location . "', '" . $entry->currentPrice . "')";$result = pg_query($query);pg_close();}?>\[/code\]Thanks