note 72579 deleted from function.session-start by peehaa

Note Submitter: r dot s dot goldsmith at far-blue dot co dot uk ---- If you ever want to know whether a session is open or has already been closed (e.g. with session_write_close()) when you need to open one (in my case, writing a framework and, therefore, not controlling the session directly), I have been unable to find an official check. However, I did notice that session_start() has the following behaviour: * If the session has been open before but is now closed, when you call session_start() the $_SESSION array is reset to the content of the session. * If the session is already open, the $_SESSION array is left totally untouched. Therefore, I came up with the following (obviously assuming you have already tested $_SESSION exists): <?php $_SESSION['testMe']='test'; @session_start(); if(isset($_SESSION['testMe'])) { echo "Session was open\n"; unset($_SESSION['testMe']); } else echo "Session was closed\n"; ?> Until someone can tell me the 'official' way to do it, this seems to work. Just to save some confusion, $_SESSION, session_id() and the SID define all maintain their values after a session_write_close() so are of no use in identifying if a session is currently open or not. Hence this trick.