note 62197 deleted from ref.session by danbrown

Note Submitter: phpkloss at wholewheatradio dot org ---- If you're having trouble with unset($_SESSION[$something]) working, here's what I discovered (Win2K/PHP 5.x.x). Assume you want to step through $_SESSION and delete (i.e. unset) certain elements. So, foreach ($_SESSION as $key=>$value) { if (stristr($key,'something_to_delete')) { echo "Will unset $key that has value of $value"; unset($_SESSION[$key]); } What I found was that although the $_SESSION elements were deleted in memory, the actual session file was not being written out with the changes (even after using session_write_close). What fixed it for me was to COPY $_SESSION INTO A DUMMY ARRAY, THEN STEP THROUGH THAT DUMMY ARRAY TO FIGURE OUT WHICH ELEMENTS OF THE REAL $_SESSION TO DELETE. I.e. foreach($_SESSION as $key=>$value) { $dummy[$key]=$value; // copy to a dummy array } foreach ($dummy as $key=>$value) { if (stristr($key,'something_to_delete')) { echo "Will unset $key that has value of $value"; unset($_SESSION[$key]); } It appears that as you're stepping through the actual $_SESSION array in a foreach, if you unset elements of it, those changes won't be recorded to the session disk file. 'Course then again, my coffee is running low so I could be wrong. But hopefully it's something others can try who might be having a similar problem.