How to create rss feeds (.xml) for our own dynamic site while using php and mysql?

I've tried every method that I knows but didn't got the solution on "How to create an rss feeds and sitemap for a dynamic site that get upda开发者_运维问答ted automatically".

The basic idea is to have your php file generate a valid RSS (xml) based on your database results. So, select the data you want to show from the MySQL db, and output them, conforming to the rss standard.

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For the sitemap it will be a little harder, and it greatly depends on your structure, which is unknown to us. But the principle is the same - output a valid xml file conforming to the sitemap standard, based on the pages you want to show.