MenuExampleDynamicRoutes.php

<?php

namespace Drupal\menu_example\Routing;

use Symfony\Component\Routing\Route;

/**
 * Defines dynamic routes for our tab menu items.
 *
 * These routes support the links created in menu_example.links.task.yml.
 *
 * @see menu_example.links.task.yml
 * @see https://www.drupal.org/docs/8/api/routing-system/providing-dynamic-routes
 */
class MenuExampleDynamicRoutes {
    
    /**
     * Returns an array of route objects.
     *
     * @return \Symfony\Component\Routing\Route[]
     *   An array of route objects.
     */
    public function routes() {
        $routes = [];
        $tabs = [
            'tabs' => 'Default primary tab',
            'tabs/second' => 'Second',
            'tabs/third' => 'Third',
            'tabs/fourth' => 'Fourth',
            'tabs/default/second' => 'Second',
            'tabs/default/third' => 'Third',
        ];
        foreach ($tabs as $path => $title) {
            $machine_name = 'examples.menu_example.' . str_replace('/', '_', $path);
            $routes[$machine_name] = new Route('/examples/menu-example/' . $path, [
                '_controller' => '\\Drupal\\menu_example\\Controller\\MenuExampleController::tabsPage',
                '_title' => $title,
                'path' => $path,
                'title' => $title,
            ], [
                '_access' => 'TRUE',
            ]);
        }
        return $routes;
    }

}