$nodelist = $client->RetrieveAmenityData($params);
$accessnodelist = $nodelist->RetrieveAmenityDataResult;
$xml_amenity_result = new SimpleXMLElement($accessnodelist);
echo '<pre>';
print_r($xml_amenity_result);
echo '</pre>';
The above code can fetch the full or long description for both array keys and values.