Redirect after PHP Login

Question

I have a subdomain

accounts.mysite.com

What i want is one login panel for that subdomain, then after a user logs in it directs them to their own page (and

Answer 1

Include a file at the top of every file that should be blocked that contains something like:

This will redirect the user to user.php everytime they try to visit another file.

Edit: And don't forget to use session_start() at the beginning of every request.