PHP Headers and Popular Mime Types
Like my Create a Basic Web Service Using PHP, MySQL, XML, and JSON illustrates, even though a file's extension ends in PHP, you can still tell the browser that you're outputting a different content type. Here are a few of the more popular content types used on the internet.
header('Content-Type: application/rss+xml; charset=ISO-8859-1');
Just because a file ends in .PHP doesn't mean it responds with XHTML -- respond however you'd like!
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