pr0gr4mm3r — Thu, 12 Apr 2007 20:50:05 +0000

Well, it depends on how you want to do it. Probably the simplest way to do it would be to use cookie authentication. I'm assuming that you know how to do the sign-in form since you said you know forms. What you need to do is set some session variable when the user logs in, like

<?php
$_SESSION['active'] = true;
?>

...and be sure to call the session_start() at the beginning of every file.

Than, to check to see is the user is signed in or not, do something like

<?php
if (!$_SESSION['active'])
{
    header('Location: sign/in/form.php');
    die();
}
?>