php__silex__book/src/demo/Controllers/BlogControllerProvider.php

<?php

namespace demo\Controllers;

use Silex\Api\ControllerProviderInterface;
use Silex\Application;
use Silex\ControllerCollection;

class BlogControllerProvider implements ControllerProviderInterface {
  const MAGIC = 'xyzzy';

  /**
   * Returns routes to connect to the given application.
   *
   * @param Application $app An Application instance
   *
   * @return ControllerCollection A ControllerCollection instance
   */
  public function connect(Application $app): ControllerCollection {
    // This is a factory service, producing a new instance every time.
    $collection = $app['controllers_factory'];
    $blog = BlogController::class;

    $collection->get('/',             "$blog::index")
      ->bind('blog_list');
    $collection->get('/{id}',         "$blog::index2")
      ->assert('id', static::MAGIC)
      // Serve '(mount)/xyzzy' when asked for '(mount)'.
      ->value('id', static::MAGIC)
      ->bind('blog_mount');

    $collection->get('/json',         "$blog::json");
    $collection->get('/json-view',    "$blog::jsonView");

    $collection->get('/{id}',         "$blog::fifiAction")
      ->assert('id', '\d+')
      // See Symfony expression language.
      ->when("request.headers.get('User-Agent') matches '/firefox/i'");

    $collection->get('/{id}',         "$blog::show")
      ->assert('id', '\d+')
      // Serve '(mount)/1' when asked for '(mount)/'.
      ->value('id', 1)
      ->bind('blog_post');

    return $collection;
  }

}