title: Get key value from xml string 2 dimensional
body: <p>I want to read some values from a string. The string is in xml format now.
  How do I get the Artist from this? </p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8" ?&gt;
  &lt;song&gt;
  &lt;filename&gt;c699da47ed08bd80927ae148c1b5b0fd.mp3&lt;/filename&gt;
  &lt;title&gt;Interlude (Imam Siraj)&lt;/title&gt;
  &lt;artist&gt;Native Deen&lt;/artist&gt;
  &lt;album&gt;Not Afraid To Stand Alone&lt;/album&gt;
  &lt;year&gt;2007&lt;/year&gt;
  &lt;genre&gt;R&amp;B&lt;/genre&gt;
  &lt;duration&gt;0:01:20 (approx)&lt;/duration&gt;
  &lt;/song&gt;
  </code></pre>
  
  <p>I have tried using simplexml but cannot figure out how to get the elements within.</p>
  
  <p>$xml = simplexml_load_string($strXML);
  $strArtist = ???</p>