README

Simple and fast configuration solution

Installation

Install with composer:

$ composer require progphil1337/simple-react-app

Compatibility

ProgPhil1337\SimpleReactApp requires PHP 8.1 (or better).

Usage

Basic example

Run your app

$ php app.php 

Example output

[INFO] Registering GET /
[INFO] Server running on 127.0.0.1:1337

app.php

use Progphil1337\Config\Config;
use ProgPhil1337\DependencyInjection\ClassLookup;
use ProgPhil1337\DependencyInjection\Injector;
use ProgPhil1337\SimpleReactApp\App;
use ProgPhil1337\SimpleReactApp\FileSystem\Pipeline\FileSystemPipelineHandler;
use ProgPhil1337\SimpleReactApp\HTTP\Request\Pipeline\DefaultRequestPipelineHandler;
use ProgPhil1337\SimpleReactApp\HTTP\Request\Pipeline\RoutingPipelineHandler;

require_once 'vendor/autoload.php';

const PROJECT_PATH = __DIR__;

$config = Config::create(__DIR__ . '/config.yml');

$classLookup = (new ClassLookup())
    ->singleton($config)
    ->singleton(Injector::class)
    ->register($config);

$container = new Injector($classLookup);

$app = new App($config, $container);

return $app->run([
    FileSystemPipelineHandler::class,
    RoutingPipelineHandler::class,
    DefaultRequestPipelineHandler::class
]);

config.yml

host: 127.0.0.1
port: 1337
public_dir: public
routing:
  cache: route.cache
handlers: App/Handler

App/Handler/IndexHandler.php

#[Route(HttpMethod::GET, '/')]
class IndexHandler implements HandlerInterface
{
    public function process(ServerRequestInterface $serverRequest, RouteParameters $parameters): ResponseInterface
    {
        return new JSONResponse(['message' => 'Hello World']);
    }
}

Interface binding example

If you type-hint an interface in your handler's or service's constructor , you must register two additional things in your ClassLookup bootstrap:

1. ->alias(Interface::class, Concrete::class) — maps the interface to its concrete implementation
2. ->register($classLookup) — registers the configured instance itself, so the injector doesn't create a blank one at request time

Without these, you will get the following runtime error when a request hits the endpoint:

Cannot instantiate interface App\Service\SomeInterface

⚠️ This error only appears at request time, not on startup — making it easy to miss.

app.php

use Progphil1337\Config\Config;
use ProgPhil1337\DependencyInjection\ClassLookup;
use ProgPhil1337\DependencyInjection\Injector;
use ProgPhil1337\SimpleReactApp\App;
use ProgPhil1337\SimpleReactApp\FileSystem\Pipeline\FileSystemPipelineHandler;
use ProgPhil1337\SimpleReactApp\HTTP\Request\Pipeline\DefaultRequestPipelineHandler;
use ProgPhil1337\SimpleReactApp\HTTP\Request\Pipeline\RoutingPipelineHandler;
use App\Service\SomeInterface;
use App\Service\SomeConcreteClass;

require_once 'vendor/autoload.php';

const PROJECT_PATH = __DIR__;

$config = Config::create(__DIR__ . '/config.yml');

$classLookup = (new ClassLookup());
$classLookup
    ->singleton(ClassLookup::class)
    ->alias(SomeInterface::class, SomeConcreteClass::class)
    ->singleton($config)
    ->singleton(Injector::class)
    ->register($config)
    ->register($classLookup); // ← must be THIS instance, not a new one

$container = new Injector($classLookup);

$app = new App($config, $container);

return $app->run([
    FileSystemPipelineHandler::class,
    RoutingPipelineHandler::class,
    DefaultRequestPipelineHandler::class
]);

App/Handler/SomeHandler.php

use App\Service\SomeInterface;

#[Route(HttpMethod::GET, '/some-route')]
class SomeHandler implements HandlerInterface
{
    public function __construct(
        private readonly SomeInterface $service // ← injected via alias
    ) {}

    public function process(ServerRequestInterface $serverRequest, RouteParameters $parameters): ResponseInterface
    {
        return new JSONResponse(['result' => $this->service->doSomething()]);
    }
}