note 92155 added to function.defined

I found something out: defined() becomes probably false if a reference gets lost. <?php session_start(); // $_SESSION created define('SESSION_BACKUP', $_SESSION); if (defined('SESSION_BACKUP')) echo 'A'; session_unset(); // $_SESSION destroyed if (defined('SESSION_BACKUP')) echo 'B'; ?> You will see "A", but not "B". ---- Server IP: 69.147.83.197 Probable Submitter: 87.165.175.197 ---- Manual Page -- http://www.php.net/manual/en/function.defined.php Edit -- https://master.php.net/note/edit/92155 Del: integrated -- https://master.php.net/note/delete/92155/integrated Del: useless -- https://master.php.net/note/delete/92155/useless Del: bad code -- https://master.php.net/note/delete/92155/bad+code Del: spam -- https://master.php.net/note/delete/92155/spam Del: non-english -- https://master.php.net/note/delete/92155/non-english Del: in docs -- https://master.php.net/note/delete/92155/in+docs Del: other reasons-- https://master.php.net/note/delete/92155 Reject -- https://master.php.net/note/reject/92155 Search -- https://master.php.net/manage/user-notes.php