Some crazy stuff you can do with php5.5/5.6

 
        function omg(Callable...$omgs)
        {
            foreach ($omgs as $omg) {
                var_dump($omg($omg));
            }
        }

        omg('strlen'); // 6


        function omg2(array...$omgs)
        {
            foreach ($omgs as list($omg1, $omg2)) {
                var_dump($omg1($omg2));
            }
        }

        omg2(['strlen', 'two'], ['strlen', 'bar']); // 3, 3