Tentative +1 for the func_name::callable version. callable seems more generic, and possibly more intuitive when scan reading code that contains lots of 'function'.
class A { static function init() { $inst = new self; var_export <http://www.php.net/var_export>($inst->bar::callable); $inst->bar(); } function bar() { var_export <http://www.php.net/var_export>(B::baz::callable); }} -- Pete Boere Web Developer