Get namespaces with php

[deezerd]

Hi
I'm using the SimpleXMLElement class to get some info of an rss feed
The thing is I get nothing about the info included in the namespaces (<media:title> <media:content> <media:credit>) when I write
print_r($xml)

For example in this code, what should I do to get the info in the media node:

<media:player url="http://youtube.com/?v=hjlQfMECSdA"/>
<media:thumbnail url="http://sjl-static10.sjl.youtube.com/vi/hjlQfMECSdA/2.jpg" width="120" height="90"/>

thanks!