PHP SESSION data lost between page loads with WAMPserver 2.0 on localhost

Question

I have a PHP authentication system on my website using the $_SESSION variable.

A form submits a username and password to the file \"login.php\". It is handled like t

Answer 1

Try to replace

if($_POST){...}

with

if( isset($_POST['username']) && isset($_POST['password']) ){...}

... at least for debugging purposes. It's possible that some different settings are causing a non-empty $_POST array where it's not expected.

Also, your code seems to be missing exit() calls after header() redirections. Sending an HTTP Location header doesn't automatically stop your script.