<?php

$router = new Yaf_Router();

$route  = new Yaf_Route_Supervar('r');

$router->addRoute("supervar", $route);

var_dump($router->getRoute('supervar')->assemble(
        array(
              ':a' => 'yafaction',
              'tkey' => 'tval',
              ':c' => 'yafcontroller',
              ':m' => 'yafmodule'
        ),
        array(
              'tkey1' => 'tval1',
              'tkey2' => 'tval2'
        )
));

try {
var_dump($router->getRoute('supervar')->assemble(
        array(
              ':a' => 'yafaction',
              'tkey' => 'tval',
              ':m' => 'yafmodule'
        ),
        array(
              'tkey1' => 'tval1',
              'tkey2' => 'tval2',
              1 => array(),
        )
));
} catch (Exception $e) {
    var_dump($e->getMessage());
}

The above example will output something similar to: