note 28568 added to function.session-is-registered

isset($_SESSION[]) and session_is_registered() are not equivalent --- $_SESSION['UID'] = 'temp'; print (int)session_is_registered('UID'); // false print (int)isset($_SESSION['UID']); // true --- Using session_register() there is an implicit call to session_start(), but it seems that using $_SESSION variables without explicity calling session_start() will not initiate a session. So it's possibled for this code to throw an error. $_SESSION['var'] = 'blah'; if(isset($_SESSION['var'])) { session_destroy(); } Minorly dodgy, because there is no guaranteed way of avoiding it, given that they tell you not to use session_is_registered() with $_SESSION. There should maybe be a session_is_started() function. -- http://www.php.net/manual/en/function.session-is-registered.php http://master.php.net/manage/user-notes.php?action=edit+28568 http://master.php.net/manage/user-notes.php?action=delete+28568 http://master.php.net/manage/user-notes.php?action=reject+28568