PHP empty session files generated by login system

Question

Recently I\'ve noticed that many blank sessions are being created, I\'m not sure why though as I believe I\'m doing everything the correct way.

At the moment we crea

Answer 1

Shouldn't header("Location: $_SERVER[HTTP_REFERER]"); need to be header("Location: $_SERVER['HTTP_REFERER']"); ? Or is that just something stupid.

EDIT:

According to PHP.net you should use the delete_old_session parameter. Have a look HERE