Service Container

Service Container and DI

// Binding in ServiceProvider
class AppServiceProvider extends ServiceProvider {
    public function register(): void {
        // Bind interface to implementation
        $this->app->bind(PaymentGateway::class, StripeGateway::class);

        // Singleton — same instance each time
        $this->app->singleton(Analytics::class, fn($app) =>
            new Analytics($app->make(HttpClient::class))
        );

        // Instance
        $this->app->instance("config.key", "value");
    }
}

// Auto-injection in controllers
class CheckoutController extends Controller {
    public function __construct(
        private PaymentGateway $gateway,  // auto-resolved!
        private OrderService $orders
    ) {}
}

// Resolve manually
$gateway = app(PaymentGateway::class);
$gateway = resolve(PaymentGateway::class);