Router.php

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<?php
class Slim_Router implements IteratorAggregate {

    protected $request;

    protected $routes;

    protected $namedRoutes;

    protected $matchedRoutes;

    protected $notFound;

    protected $error;

    public function __construct( Slim_Http_Request $request ) {
        $this->request = $request;
        $this->routes = array();
    }

    public function getIterator() {
        return new ArrayIterator($this->getMatchedRoutes());
    }

    public function getRequest() {
        return $this->request;
    }

    public function setRequest( Slim_Http_Request $req ) {
        $this->request = $req;
    }

    public function getMatchedRoutes( $reload = false ) {
        if ( $reload || is_null($this->matchedRoutes) ) {
            $this->matchedRoutes = array();
            foreach ( $this->routes as $route ) {
                if ( $route->matches($this->request->getResourceUri()) ) {
                    $this->matchedRoutes[] = $route;
                }
            }
        }
        return $this->matchedRoutes;
    }

    public function map( $pattern, $callable ) {
        $route = new Slim_Route($pattern, $callable);
        $route->setRouter($this);
        $this->routes[] = $route;
        return $route;
    }

    public function cacheNamedRoute( $name, Slim_Route $route ) {
        if ( isset($this->namedRoutes[(string)$name]) ) {
            throw new RuntimeException('Named route already exists with name: ' . $name);
        }
        $this->namedRoutes[$name] = $route;
    }

    public function urlFor( $name, $params = array() ) {
        if ( !isset($this->namedRoutes[(string)$name]) ) {
            throw new RuntimeException('Named route not found for name: ' . $name);
        }
        $pattern = $this->namedRoutes[(string)$name]->getPattern();
        $search = $replace = array();
        foreach ( $params as $key => $value ) {
            $search[] = ':' . $key;
            $replace[] = $value;
        }
        $pattern = str_replace($search, $replace, $pattern);
        //Remove remnants of unpopulated, trailing optional pattern segments
        return preg_replace(array(
            '@\(\/?:.+\/??\)\??@',
            '@\?|\(|\)@'
        ), '', $this->request->getRootUri() . $pattern);
    }

    public function notFound( $callable = null ) {
        if ( is_callable($callable) ) {
            $this->notFound = $callable;
        }
        return $this->notFound;
    }

    public function error( $callable = null ) {
        if ( is_callable($callable) ) {
            $this->error = $callable;
        }
        return $this->error;
    }

}