note 86138 added to function.isset

It has been remarked by various people that isset is the opposite of is_null "in all but buggy cases". This is not true: <?php $str = "hi"; var_dump(isset($str[1])); var_dump(@!is_null($str[1])); var_dump(isset($str[2])); var_dump(@!is_null($str[2])); ?> outputs bool(true) bool(true) bool(false) bool(true) ---- Server IP: 212.108.64.191 Probable Submitter: 89.100.142.134 ---- Manual Page -- http://www.php.net/manual/en/function.isset.php Edit -- https://master.php.net/note/edit/86138 Del: integrated -- https://master.php.net/note/delete/86138/integrated Del: useless -- https://master.php.net/note/delete/86138/useless Del: bad code -- https://master.php.net/note/delete/86138/bad+code Del: spam -- https://master.php.net/note/delete/86138/spam Del: non-english -- https://master.php.net/note/delete/86138/non-english Del: in docs -- https://master.php.net/note/delete/86138/in+docs Del: other reasons-- https://master.php.net/note/delete/86138 Reject -- https://master.php.net/note/reject/86138 Search -- https://master.php.net/manage/user-notes.php