New in Symfony 7.2: Simpler Single-File Symfony Applications
Symfony allows you to create single-file applications which are useful for
simple workers, microservices, CLI tools, minimal APIs, and more. Here’s an
example of a single-file application as it looks today:
// index.php
use AppGeneratorNumberGenerator;
use SymfonyBundleFrameworkBundleKernelMicroKernelTrait;
use SymfonyComponentDependencyInjectionLoaderConfiguratorContainerConfigurator;
use SymfonyComponentHttpFoundationJsonResponse;
use SymfonyComponentHttpFoundationRequest;
use SymfonyComponentHttpKernelKernel as BaseKernel;
use SymfonyComponentRoutingAttributeRoute;
require __DIR__.‚/vendor/autoload.php‘;
class Kernel extends BaseKernel
{
use MicroKernelTrait;
public function registerBundles(): array
{
return [
new SymfonyBundleFrameworkBundleFrameworkBundle(),
];
}
protected function configureContainer(ContainerConfigurator $container): void
{
$container->extension(‚framework‘, [
’secret‘ => ‚S0ME_SECRET‘
]);
// alternatively, define this in a configuration file and load it as:
// $container->import(__DIR__.’/../config/framework.yaml‘);
}
(‚/random/{limit}‘, name: ‚random_number‘)
public function randomNumber(int $limit, NumberGenerator $numberGenerator): JsonResponse
{
return new JsonResponse([
’number‘ => $numberGenerator->generate($limit),
]);
}
}
return static function (array $context) {
return new Kernel($context[‚APP_ENV‘], (bool) $context[‚APP_DEBUG‘]);
}
In Symfony 7.2, we’ve simplified the MicroKernelTrait. Now, the same
application looks like this:
// index.php
use AppGeneratorNumberGenerator;
use SymfonyBundleFrameworkBundleKernelMicroKernelTrait;
use SymfonyComponentHttpFoundationJsonResponse;
use SymfonyComponentHttpKernelKernel as BaseKernel;
use SymfonyComponentRoutingAttributeRoute;
require __DIR__.‚/vendor/autoload.php‘;
class Kernel extends BaseKernel
{
use MicroKernelTrait;
(‚/random/{limit}‘, name: ‚random_number‘)
public function __invoke(int $limit, NumberGenerator $numberGenerator): JsonResponse
{
return new JsonResponse([
’number‘ => $numberGenerator->generate($limit),
]);
}
}
return static function (array $context) {
return new Kernel($context[‚APP_ENV‘], (bool) $context[‚APP_DEBUG‘]);
}
The changes introduced in Symfony 7.2 are:
The config/ directory is now optional, so you can omit it entirely if you
define the configuration in the configureContainer() method;
The bundles.php file is also optional and the registerBundles() method
now defaults to yield new FrameworkBundle();. This removes the need to
define that method when no other bundles are loaded;
Support for service injection in invokable actions using the __invoke() method;
The framework.secret parameter is now optional (related to a different
pull request that will be covered in another blog post).
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