Array para XML

array_to_xml.php

<?php
/**
 * Transforma um array em xml
 */
$test_array = array (
  'bla'           => 'blub',
  'foo'           => 'bar',
  'another_array' => array (
    'stack'       => 'overflow',
  ),
);
$xml = new SimpleXMLElement('<root/>');
array_walk_recursive($test_array, array ($xml, 'addChild'));
print $xml->asXML();