Starting with version 3.0.7 PHP has XML stream-parsing support (via James Clark's expat library). 
Documentation in the PHP 5 Manual is in CXXIX. XML Parser Functions.

<p>
Still works with PhP 4.3.4 [DKS March 2004]. Still works with PHP 5.0.x [DKS Feb 2005].
<P>
<pre>
  <A HREF="list-xml-elements.php">list-xml-elements.php</A>: lists all the XML elements

  <A HREF="map-x-html.php">map-x-html.php</A>: Maps each XML tag to ONE html tag

  <A HREF="map-x-html2.php">map-x-html2.php</A>: Maps each XML tag to arbitrary html/text (best looking version)

</pre>
<P>
  The <A HREF="choco-chip.xml">XML example</A> is stolen from
Jay Greespan's 
<A HREF="http://www.hotwired.com/webmonkey/98/41/index1a_page6.html?tw=html">http://www.hotwired.com/webmonkey/98/41/index1a_page6.html?tw=html</A>
</P>
<hr>
<ADDRESS>
  <A NAME="Signature"
     HREF="http://tecfa.unige.ch/tecfa-people/schneider.html">D.K.S.</A>
</ADDRESS>