building upon the code RE: Differences

I hope I'm not being a pest. I've played with the return and echo so much today I've finally realized I'm going in circles. But I can say I understand it more than ever. Now whats on my mind is breaking out of this circle and doing more with this code. What I am trying to do now is instead of having ALL the images display, I want to try and group them by their name. If I were using SQL I'd simply use a where clause and be done with it, but I'm not sure what would acomplish the same thing or similiar to a where clause in php. -- David M.