[PHP] Array to XML

helpers.php

private function arrayToXML($data, &$xml)
{
    foreach ($data as $key => $value) {
        if (is_array($value)) {
            if (is_numeric($key)) {
                $key = 'item'.$key; //dealing with <0/>..<n/> issues
            }
            $subnode = $xml->addChild($key);
            array_to_xml($value, $subnode);
        } else {
            $xml->addChild("$key", htmlspecialchars("$value"));
        }
    }
}

private function prepareXML(array $array)
{
    $xml = new SimpleXMLElement('<?xml version="1.0"?><data></data>');
    $this->array_to_xml($data, $xml);
    return $xml; # Get XML with $->asXML(), save it with $->asXML({path})
}