note 21357 added to function.is-a

Any implementation of is_a that relies on empty() to test whether the object parameter is empty will not work (as I painfully discovered...), since empty returns true for an object with no attributes (ie. only methods). While it generally may not be useful to have an object with no attributes, there are some cases where it is necessary (eg. since call_user_func() doesn't work with classes, only objects...) This last version by php@electricsurfer.com seems to work for me... -- http://www.php.net/manual/en/function.is-a.php http://master.php.net/manage/user-notes.php?action=edit+21357 http://master.php.net/manage/user-notes.php?action=delete+21357 http://master.php.net/manage/user-notes.php?action=reject+21357