Fix uses of session_start($_GET['id']) about website HOT 2 CLOSED

My only worry with this is that currently the session_start(); is just being ignored because its throwing a warning and its just proceeding, so currently the code doesn't do what is expected and I'm afraid changing it to be syntactically correct will drastically change how the sessions start to get handle in PHP and mess something up. We use PHP sessions to verify every single user interaction with the server so messing them up would effectively break the site. I am aware that it is syntactically incorrect and some of our new session code follows the session_id($_GET['session_id'); format.

from website.

Well you could rip out all instances of session_id and maintain current functionality since the parameter is totally ignored at the moment anyway, and therefore it's sort of pointless to be passing it around.

from website.