building Role based application

Question

I have to make a small website

where I have 7 type of users. which can login into system.

some of users have permissions to only add equipments and others ca

Answer 1

It sounds like you are going to need a role-based access control system. Developing one is not really a trivial task, so as already suggested, finding a framework or ready-made class that does the job would be a worthwhile start.

However, there's plenty of information out there on how to create one. Here's a few links to get you started:

Stackoverflow

Role Based Access Control
Role-based access to pages in PHP (dead link)

Other sites

A Role-Based Access Control (RBAC) system for PHP
Fine Grained Role Based Access Control (RBAC) system
Patterns Tutorial Series (part 1): RBAC Domain Model

A search for PHP RBAC will no doubt reveal many more.