<?php

$router = new Yaf_Router();

$route  = new Yaf_Route_Simple('m', 'c', 'a');

$router->addRoute("simple", $route);

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

The above example will output something similar to: