Categorize and structure database - php

Question

I've been pondering the best way to approach the structure of this database. What I have so far is:
table category
cat_id (PK)
title
table sub_cat
sc_id (PK)
cat_id (FK)
title
This is all fine since I could use it as follows:
Car -> Mazda
computer hardware -> CPU
clothing -> Male :: Pants
Car Parts -> Mazda :: Spoilers
...
The problem is how could I best structure the database to further utilize the best of each category. The cars data will require a lot of fields suitable for cars alone which another category may require something completely different.
It should be said there will be a lot of categories.

Answer 1

Possible is to create a table 'Details', built something like this
= ItemId === DetailId === DetailValue =
| Somecar1 | 1 | Blue |
| Somecar2 | 2 | Four |
| Somecar2 | 1 | Pink |
| Somecar2 | 2 | Two |
=======================================
Where DetailId refers to something like this, detailreference;
= CategoryId === DetailId === DetailString =
| 1 | 1 | Color |
| 1 | 2 | Doors |
============================================
If you want to get the info of Somecar1, you should query the Details table for the data, then query detailreference to get the type of detail stored inside of a certain number, for a certain category.