Drupal 7 Form Redirect with added Parameters.

gistfile1.txt

 // This will redirect the page on form load to: $base_url/node?search=FOO&reset
        $form_state['redirect'] = array(
            'node',
            array(
                'query' => array(
                    // adds to url: ?search=FOO
                    'search' => $var,
                    // adds to url: &reset
                    'reset' => NULL,
                ),
            ),
        );