<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2017/4/5
 * Time: 9:37
 */
$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();