checking for registered variables.

[Anon]

I have a register form and after the client enters his information the database is updated and the user is directed into the password protected pages. I want to stop the user from hitting his back button and returning to the register screen after he has entered his information. I tried using this code to check to see if the username is registered but this code does not work. How do you keep users from getting back to your register screens after they have registered?

if (session_is_registered ( "username" ) )
{
header( "Location: /warning.php" );
}

thanks.

[Anon]

You cannot prevent a user from going back to the login page. The only thing you can do is like you indicated, checking if the user is logged in. What is there that doesn't work in your example? Have you registerd the $username variable properly? Is there a session being made (check your session directoy, which one is depending on your os and php settings; if you use a database for your sessions, check the database)