note 117705 added to function.isset

I found something interesting while working with isset() in PHP5.5+ <?php $a = "foo"; $b = "bar"; var_dump(isset($a, $b)); //returns true unset($b); var_dump(isset($a,$b)); // returns false (as expected); ...BUT... var_dump(!isset($a,$b)); // STILL returns true! ---- Server IP: 72.52.91.14 Probable Submitter: 67.174.223.79 ---- Manual Page -- http://php.net/manual/en/function.isset.php Edit -- https://master.php.net/note/edit/117705 Del: integrated -- https://master.php.net/note/delete/117705/integrated Del: useless -- https://master.php.net/note/delete/117705/useless Del: bad code -- https://master.php.net/note/delete/117705/bad+code Del: spam -- https://master.php.net/note/delete/117705/spam Del: non-english -- https://master.php.net/note/delete/117705/non-english Del: in docs -- https://master.php.net/note/delete/117705/in+docs Del: other reasons-- https://master.php.net/note/delete/117705 Reject -- https://master.php.net/note/reject/117705 Search -- https://master.php.net/manage/user-notes.php