如何遍历cURL simpleXML对象？

I have retrieved the xml file successfully and printed it out as an array but what I want to do is loop through the file and perform some operations on each record. I tried a foreach loop with ->children but I just can;t seem to print anything

$curl = curl_init();
curl_setopt_array($curl, Array(
        CURLOPT_URL            => 'http://www.test.co.uk/test.xml',
        CURLOPT_USERAGENT      => 'spider',
        CURLOPT_TIMEOUT        => 120,
        CURLOPT_CONNECTTIMEOUT => 30,
        CURLOPT_RETURNTRANSFER => TRUE,
        CURLOPT_ENCODING       => 'UTF-8'
));
$data = curl_exec($curl);
curl_close($curl);
$xml = simplexml_load_string($data, 'SimpleXMLElement', LIBXML_NOCDATA);
//die('<pre>' . print_r($xml, TRUE) . '</pre>');
echo $xml->row[0]['user'];
die();

Data looks like this in the array:

<pre>SimpleXMLElement Object
(
    [row] => Array
        (
            [0] => SimpleXMLElement Object
                (
                    [user] => aaa
                    [enabled] => 1
                    [email_address] => aaa@gmail.com
                    [OrderDate] => 2018-08-01 10:25:04
                    [products_id] => 381
                    [NewOrder] => 0
                    [ResendKeys] => 0
                    [LastUpdate] => 2018-12-19 02:36:26
                )

            [1] => SimpleXMLElement Object
                (
                    [user] => bbb
                    [enabled] => 1
                    [email_address] => bbb@gmail.com
                    [OrderDate] => 2018-12-19 02:50:27
                    [products_id] => 380
                    [NewOrder] => 0
                    [ResendKeys] => 1
                    [LastUpdate] => 2018-12-19 02:50:27
                )