You could use a 3rd-party solution such as MagpieRSS. (There are quite a few others, this is just the first one I remembered someone else mentioning that he used.)
If you want to write your own, the SimpleXML or DOM extension is the way I'd approach it.
"Please give us a simple answer, so that we don't have to think, because if we think, we might find answers that don't fit the way we want the world to be."
~ Terry Pratchett in Nation
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