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<?php class Foo { public static function bar() { $args = func_get_args(); var_dump($args); } } $method = array('Foo', 'bar'); $args = 123; call_user_func($method, $args) // NOT WORKING it just don't goes in the methods call call_user_func($method, 123) // NOT WORKING it just don't goes in the methods call call_user_func($method, (int) 123) // WORKING !! $method = array('Foo', 'bar'); $args = array(123, 456); call_user_func_array($method, $args) // NOT WORKING call_user_func_array($method, (array) $args) // NOT WORKING it just don't goes in the methods call call_user_func_array($method, array((array) $args)) // WORKING !!