Our API is REST(ish..). Our SDK is built on top in PHP but you can access via any SDK. For instance try directly in your browser : http://ws.maniaplanet.com/foobar/ or http://ws.maniaplanet.com/foobar/index.json I don't understand your second question about ranking. Well sh..t thats my bad! I jumpe...

1) Why is the API not json restful unified instead of php? Is there any chance you are changing this?
2) When you look under stats you can see your friends rank, but u cant see your own? Also would be nice to see their various ranks based on geo like in the game when finnishing a race.