MySQL Admin Tool

Ello all! Whazzup? Ok, I'm over it. Now... Does anyone know how to set up MySQL, or phpMyAdmin to restrict users to a single database? For instance, the user JoeBlow... Joe has a database called JB, I want him to have full access to it and nothing else. How would I go about doing this? I'd also like him to have access to it via PHP, so he can write his own PHP script that'll let him manipulate his database. I just need to lock him out of averything else. And also... How do I go about securing PHP functions. For example, at the moment Joe can upload a PHP script that deletes /etc/named.conf. NOT GOOD! Is there some options you can parse to PHP at compile tim that will deactivate these features, or maybe some other way I can give users full access to all of the PHP functions, but they're restricted to their home dir. Thanks for your help! - Liam