note 89193 deleted from book.session by danbrown

Note Submitter: John Walker ---- This is a caution to those attempting to use session features for the first time. The documentation might lead one to believe that sessions are relatively easy to implement; they probably are...once you have succeeded once. However, the notes below should be a warning that the documentation is definitely "lite" on key details to get you over that first hurdle. I still haven't managed to keep sessions working (I had them working last night but it stopped working this morning) after 3 days of trying, and I have 10 years of experience with PHP. Be very clear what triggers sending of headers (because that will mess you up) and where $_SESSION becomes unavailable (see below).