Inserting PHP/MYSQL in a XML Type signature...

I run an internet based game and I was wondering if it was possible to make a type of signature for forums and things that grabs things from the game, and inputs it into an area, and updates every once in a while. Like, somone could use a signature in any forum, and it would display their character name, Level, Gold, all that stuff, would this be possible to do in XML, or is there an easier way to do it securily in some other language, if so how, if xml is the best way, how would I start. I have seen Counter-Strike people can do this in forums, and wonddered how they did it. It would need to connect to the database, is that possible, I have never done this before. Would it work with PHP, embedded or anything? Thank you whoever helps me out with this.