Use PHP to define the services and routes of the app

symfony/framework-bundle/5.1/config/bootstrap.php

@@ -0,0 +1 @@
+../../4.2/config/bootstrap.php

symfony/framework-bundle/5.1/config/packages

@@ -0,0 +1 @@
+../../4.2/config/packages/

symfony/framework-bundle/5.1/config/routes/dev/framework.yaml

@@ -0,0 +1,3 @@
+_errors:
+    resource: '@FrameworkBundle/Resources/config/routing/errors.xml'
+    prefix: /_error

symfony/framework-bundle/5.1/src/Kernel.php

@@ -4,6 +4,7 @@
 
 use Symfony\Bundle\FrameworkBundle\Kernel\MicroKernelTrait;
 use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;
+use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\Kernel as BaseKernel;
 use Symfony\Component\Routing\Loader\Configurator\RoutingConfigurator;
 
@@ -15,14 +16,41 @@ protected function configureContainer(ContainerConfigurator $container): void
     {
         $container->import('../config/{packages}/*.yaml');
         $container->import('../config/{packages}/'.$this->environment.'/*.yaml');
-        $container->import('../config/{services}.yaml');
-        $container->import('../config/{services}_'.$this->environment.'.yaml');
+
+        // Put parameters here that don't need to change on each machine where the app is deployed
+        // https://symfony.com/doc/current/best_practices/configuration.html#application-related-configuration
+        //$parameters = $container->parameters();
+        //$parameters->set(...);
+
+        $services = $container->services();
+
+        // makes classes in src/ available to be used as services
+        $services
+            ->load('App\\', './*')
+            ->exclude('./{DependencyInjection,Entity,Migrations,Tests,Kernel.php}');
+
+        // controllers are imported separately to make sure services can be injected
+        // as action arguments even if you don't extend any base controller class
+        $services
+            ->load('App\\Controller\\', './Controller')
+            ->tag('controller.service_arguments');
+
+        // add more service definitions when explicit configuration is needed
+        // please note that last definitions always *replace* previous ones
+        //$services->set(...);
     }
 
     protected function configureRoutes(RoutingConfigurator $routes): void
     {
         $routes->import('../config/{routes}/'.$this->environment.'/*.yaml');
         $routes->import('../config/{routes}/*.yaml');
-        $routes->import('../config/{routes}.yaml');
+
+        $routes->add('hello', '/hello')
+            ->controller([$this, 'helloAction']);
+    }
+
+    public function helloAction()
+    {
+        return new Response('Hello World');
     }
 }

symfony/routing/5.1/config/packages

@@ -0,0 +1 @@
+../../4.2/config/packages/

symfony/routing/5.1/manifest.json

@@ -0,0 +1,6 @@
+{
+    "copy-from-recipe": {
+        "config/": "%CONFIG_DIR%/"
+    },
+    "aliases": ["router"]
+}