Demonstrating possible Router usage ...

NoCrupht_Router.php

<?php

namespace NoCrupht;

class Router
{
    /**
     * Holds array of routes
     *
     * @var array
     */
    protected $routes = array();
    
    /**
     * Holds closure for action execution
     * 
     * @var \Closure
     */
    protected $executeClosure;

    /**
     * Construct method
     *
     * @param array $routes
     * @param \Closure $executeClosure Any closure that accepts action and params
     */
    public function __construct(array $routes, \Closure $executeClosure)
    {
        foreach ($routes as $route) {
            $this->addRoute($route);
        }

        $this->executeClosure = $executeClosure;
    }

    /**
     * Executes action for given url
     * 
     * @param string $url
     */
    public function execute($url)
    {
        $route = $this->getRoute($url);
        return $this->executeClosure($route->getAction, $route->getParams($url));
    }

    /**
     * Finds route matching url
     *
     * @param string $url
     *
     * @return \WorkoutTracker\Web\Route
     */
    protected function getRoute($url)
    {
        foreach ($this->routes as $route) {
            if ($route->isMatch($url)) {
                return $route;
            }
        }
    }

    /**
     * Adds route
     *
     * @param \WorkoutTracker\Web\Route $route
     */
    protected function addRoute(Route $route)
    {
        $this->routes[] = $route;
    }
}

router_usage.php

<?php

// instantiate Router with array of route arrays
// perhaps a closure can be used for action execution
$router = new \NoCrupht\Router(
    array(
        // new Route(pattern, action, params)
        new Route('/program/create', 'Program\Create'),
        new Route('/program/:id/edit', 'Program\Create', array('id' => '\d+')),
    ),
    function ($action, $params) {
        $class = sprintf('\WorkoutTracker\Web\Action\%s', $action);
        $object = new $class();
        // this could be a chance to do other work on the object, such as injecting 
        // dependencies without having to pass them through the Router interface
        return call_user_func_array(array($object, 'execute'), $params);
    }
);

// and finally, executing an action
$router->execute('/program/create');
$router->execute('/program/1/edit');