<?php
$s = '<?xml version="1.0" encoding="UTF-8"?>
<product id="p02">
<name>Name 2</name>
<price currency="USD">200</price>
</product>
';
$product = simplexml_load_string($s);
echo 'id: ' .$product['id'];
echo '<br>currency: ' .$product->price['currency'];
?>
Output
id: p02
currency: USD