PHP and MySQL Web Development 4th Ed-tqw-_darksiderg

Implementing Authentication with Session Control
523
Listing 23.5
Continued
echo ‘You are not logged in.’;
echo ‘Only logged in members may see this page.’;
}
echo ‘Back to main page’;
?>
This code simply starts a session and checks whether the current session contains a registered
user by checking whether the value of $_SESSION[‘valid_user’] is set. If the
user is logged in, you show her the members’ content; otherwise, you tell her that she is
not authorized.
Finally, the logout.php script signs a user out of the system.The code for this script
is shown in Listing 23.6.
Listing 23.6 logout.php—This Script Deregisters the Session Variable and Destroys
the Session
Log out
Back to main page