note 46729 added to function.isset

Warning, isset() returns false for variables or array elements set to NULL! $arr[key] = 0; echo isset($arr[key]); // true $arr[key] = ""; echo isset($arr[key]); // true $arr[key] = NULL; echo count($arr); // 1 $arr[key] = NULL; echo serialize($arr); // a:1:{s:3:"key";N;} $arr[key] = NULL; echo isset($arr[key]); // false !! (Tested with PHP 4.3.2) ---- Manual Page -- http://www.php.net/manual/en/function.isset.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+46729 Delete -- http://master.php.net/manage/user-notes.php?action=delete+46729&report=yes Reason: bad code -- http://master.php.net/manage/user-notes.php?action=delete+46729&report=yes&reason=bad+code Reason: spam -- http://master.php.net/manage/user-notes.php?action=delete+46729&report=yes&reason=spam Reason: useless example -- http://master.php.net/manage/user-notes.php?action=delete+46729&report=yes&reason=useless+example Reason: contains commercial links -- http://master.php.net/manage/user-notes.php?action=delete+46729&report=yes&reason=contains+commercial+links Reason: useless note -- http://master.php.net/manage/user-notes.php?action=delete+46729&report=yes&reason=useless+note Reject -- http://master.php.net/manage/user-notes.php?action=reject+46729&report=yes Search -- http://master.php.net/manage/user-notes.php