controller.php

<?php

class Foo
{
  public function bar($output, $model)
  {
    // magic ...
    $output->addData(["foo" => $model->getFoo()]);
  }
}

routes.php

<?php

class RouteCollection {
  public function define()
  {
    $this->route = [
      "url" => "foo",
      "method" => "GET",
      "action" => function($app) {
        $app["outputHandler"] = "view";
        $app["output.service"]->add($app["fooView"]);
        // this can be wrapped up into a service in need be
        $app["foo.controller"]->bar($app["output.service"], $app["fooModel"]);
      }
    ];
    
    $this->route = [
      "url" => "api/foo",
      "method" => "GET",
      "action" => function($app) {
        $app["outputHandler"] = "json";
        // this can be wrapped up into a service in need be
        $app["foo.controller"]->bar($app["output.service"], $app["fooModel"]);
      }
    ];
  }
}