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function arr2xml($data, $rootNodeName = 'response', $xml = null) {

                    if ($xml == null) {
                              $xml = simplexml_load_string("<$rootNodeName />");
                    }

                    // loop through the data passed in.
                    foreach($data as $key => $value) {
            // no numeric keys in our xml please!
            if (is_numeric($key)) {
                // make string key...
                $key = "unknownNode_". (string) $key;
            }

            // replace anything not alpha numeric
            $key = preg_replace('/[^a-z_0-9]/i', '', $key);

            // if there is another array found recrusively call this function
            if (is_array($value)) {
                $node = $xml->addChild($key);
                // recrusive call.
                arr2xml($value, $rootNodeName, $node);
            } else {
                // add single node.
                $value = $value;
                $xml->addChild($key,$value);
            }
        }

                    // pass back as string. or simple xml object if you want!
        $res = substr($xml->asXML(), 22);
        return $res;

    }