extract url from xml response and redirect

Hi,
I submit form data as an xml string - $strXML - using curl:

curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, ‘1’);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, array(‘lead’=>$strXML));
$strResult = curl_exec($ch);
// close cURL resource, and free up system resources
curl_close($ch);

The xml response is:

0 0 1 http://www.xxx.com

and I need to redirect the user to <redirect_url>.

I am trying the following:

$xml = new SimpleXMLElement($strResult);
header(“Location:” . $xml->result->redirect_url);

but with no joy.
Could anyone suggest how I can achieve what I want?
Thanks.

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