[Silmarillion]

Hey there! My first post here and I'm already asking for something.

I've been scouring the net for a program and can't seem to find what I need. Or, maybe I'm just not recognizing it when I see it.

First, I am capable with both PHP and MySQL, so they are obviously my preferred languages.

I need a program that does the following:

~ Allows me to insert information into a database
~ Displays said information on a webpage
~ Has a good search function
~ Has customizable fields for input/display
~ Has customizable templates so I can match my current design
~ User friendly for guests who are searching for said information
~ Has customizable categories
~ Has deep subcategories (unlimited would be nice, but at least 4 deep)

(I think those are the key points)

I'm building a database of information that is divided into several categories, then multiple layers of subcategories. You can see here what I've started and get some idea what I'm going for. Currently I'm using this program: http://classifieds.phpoutsourcing.com/features.php but there are a few problems with it (as far as my use is concerned). It's not very easy to customize, for one thing. The code is difficult to understand and modify. If I have something that belongs in more than one category, it requires that I put it in each category individually. This means more work (for me) and also means that search results on an item will result in 3 or 4 of the same thing coming up....just in different categories. This could be misleading/confusing. (for users) And, the search function keeps giving me errors that I can't seem to isolate and fix (due to the functions being difficult to track)

The closest thing I can find to what I need are some classified ads programs, hence what I'm currently using. But I'm just wondering if anyone else might have a good idea of something else that could be better to use?