Some random routing idea...

gistfile1.php

<?
class ToroRoute {
  function __construct($route, $patterns) { 
    
  }
  
  public function matches_url($url) { 
  
  }
  
  public static function prepare_route() {
    
  }
}

class SomeHandler {
  public function get($username, $action) {
    echo "hi $username - you want to call $action";
  }
}

/////////////////////////////////////////////

function prepare_named_routes($matches) {
  return "([a-zA-Z0-9-_]+)";
}

// Have a URL
$url = "/user/dude/rug";

// Prepare the route
$route = "user/:username/:action";
$route_regex = str_replace('/', '\/', $route);
$route_regex = preg_replace_callback("|:[a-zA-Z_]+|", "prepare_named_routes", $route_regex);

// Match the route to the url
if (preg_match('/^\/' . $route_regex . '\/?$/', $url, $matches)) {
  $handler_instance = new SomeHandler();
  $request_method = "get";
  unset($matches[0]);
  $method_arguments = $matches;
  call_user_func_array(array($handler_instance, $request_method), $method_arguments);
}