I've been having an issue with php variables recently. I don't have much experience working with sessions, but I know that domain.com and www.domain.com are viewed differently when working with sessions. The problem I have is with included files. I am calling .../logbook/header.php from ...logbook/Graphs/index.php. When I use include_once('header.php') from files within logbook/, I am able to use the session variables, but when I include the full path in the include_once() command, I can't access the session. How can I set the session so that it is accessible to both 'header.php' and '.../full path/header.php'?