On the Wireless Developer's Network, there's an article posted with a step-by-step guide for "parsing XML with PHP".

Last week, we presented a simple framework (named XMLCast) for distributing content to a variety of devices using XML. This application was built using Microsoft's Active Server Pages (ASP) technology but we realize that many of you aren't using ASP (we aren't either).

This article will present the concept of XML parsing using the PHP scripting language. In the coming weeks, we will follow this example up with an expansion of XMLCast using other tools such as XSLT and Cocoon.

They use the expat parsing method (startElement, endElement, and characterData) to get the data out of the structure. I'm more of a DOM kind of guy, but as a good old standby, this method works just fine...