Can i do that?

Hi list, I have freeradius-1.1.3 doing accounting with mysql. I am thinking to create 2 or 3 new tables in the radius db for my purposes and write in them the info i want every time freeradius writes data to the other tables (nas ,radcheck ,radacct etc.). Is it possible to do that ? If yes how ? If yes is it possible to do it using php scripts and not perl (for example to call a php script to update my tables every time freeradius writting accounting data in the radius db) Thanks a lot