Secure .php

[smithveg]

Hello,

From my additional works, i have add an enquiry form in my sites [url=http://www.halalproductsonline.com]http://www.halalproductsonline.com
[/url]
By now, i would like to keep track every enquiry in the database, i will use the same database.
Actually, i haven't done it yet, because i don't know how to write the php code to open the database and access it.
Is i need to write some configuration? I'm not sure.

Ok, after i have keep all the things in database, i would like to retrive it out. To retrieve the information from database is not hard if i know how to open and connect to database.

If all the things is ok, I need to add the security. I had follow the step in the url below, but it seems not works. Is there anything wrong? Because i just paste paste the code in plain text and save as .php.
http://www.devshed.com/c/a/PHP/Creating ... in-Script/

Can anyone helps me fix this secure php problem first?
If you want to see how i combine the code from the url about, you can reply me here.

smith