With this guide I will try to go through the very basic techniques of making a simple php script that can handle login authorization of website users.

The guide will be based on common Linux installations of both MySQL and PHP.

Step 1 – the database

Create a table…

Have you ever had the need to check if a specific coordinate (point) is located inside or outside a polygon shaped area? I never did, so I had to found out how to automate this process, so I didn’t have to do this by hand.

The problem with this…