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To decouple a Laravel app, keep application rules behind clear boundaries and put framework, database, queue, mail, and third-party details in replaceable adapters. Laravel’s service container can wire those pieces together; hexagonal architecture is a design choice, not a framework-mandated folder structure or a requirement to add an interface for every class.
What hexagonal architecture means in a Laravel app
Hexagonal architecture separates the application’s meaningful behavior from the technologies it uses. The application core contains use cases and rules. It defines ports—interfaces that describe what the core needs or offers. Adapters connect those ports to particular technologies, such as a payment provider, database, queue, or mail service.
The dependency direction matters: application behavior depends on the port, not on a vendor SDK or Laravel implementation. An adapter implements the port and translates between the application’s terms and the external system’s terms. Laravel can still start the app, resolve classes, and connect the adapter; the goal is to avoid letting those framework details dictate the application rules.
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How to use an application-owned port
Put an interface at a boundary when it expresses a genuine application need—for example, charging a payment or sending a receipt. Keep it in a namespace your application owns. The following is illustrative PHP; adapt namespaces and method signatures to your project.
<?php
namespace AppApplicationPayments;
interface PaymentGateway
{
public function charge(int $amountInCents, string $currency): string;
}
final class PlaceOrder
{
public function __construct(private PaymentGateway $payments) {}
public function handle(int $amountInCents, string $currency): string
{
return $this->payments->charge($amountInCents, $currency);
}
}An infrastructure adapter implements that port and contains the provider-specific call. Keep vendor request objects, response parsing, and provider error handling inside the adapter where practical, translating the result into values or exceptions the application understands.
Bind the port to an adapter in Laravel
Laravel’s 13.x service-container documentation describes the container as a tool for managing dependencies and dependency injection. It supports binding an interface to an implementation and resolving dependencies for framework-managed classes such as controllers, listeners, middleware, and queued jobs. See Laravel’s service-container documentation.
Register the binding in a service provider that Laravel loads:
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<?php
namespace AppProviders;
use AppApplicationPaymentsPaymentGateway;
use AppInfrastructurePaymentsProviderPaymentGateway;
use IlluminateSupportServiceProvider;
final class AppServiceProvider extends ServiceProvider
{
public function register(): void
{
$this->app->bind(PaymentGateway::class, ProviderPaymentGateway::class);
}
}When Laravel resolves a class such as a controller that type-hints PlaceOrder, it can construct the use case and supply the bound PaymentGateway. The controller can then invoke the use case without constructing the provider adapter itself. For a long-lived, stateless adapter, a singleton binding may be appropriate; use a regular binding when you want a fresh instance per resolution. Choose based on the adapter’s state and lifecycle, not as an architecture rule.
Application-owned ports and Laravel contracts are different
Laravel contracts are interfaces naming services supplied by the framework. An application-owned port instead names a capability the application needs, such as charging a payment. Either can appear in application code, but they serve different purposes: a framework contract is part of Laravel’s vocabulary, while an application port puts the boundary in the application’s vocabulary. Choosing the latter for a particular boundary is an architectural recommendation, not a Laravel requirement.
For example, injecting a Laravel contract can make sense when a class genuinely needs a framework service. If a business use case should stay independent of a framework-specific service, define an application-owned port and adapt it at the edge. Avoid wrapping every framework facility automatically: abstraction is useful when it clarifies a real boundary, makes a volatile dependency replaceable, or protects meaningful behavior.
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Laravel supports both contracts and facades. Contracts make dependencies explicit in constructors; facades offer convenient access without constructor injection. Laravel’s 12.x contracts documentation says the choice depends on personal and team preference and that either can support robust, well-tested applications. Its 13.x package guidance says they provide essentially equal testability when writing an application. See Laravel’s contracts documentation and Laravel’s package-development guidance.
| Consideration | Contracts or constructor injection | Facades |
|---|---|---|
| Dependency visibility | The constructor shows the dependency directly. | The dependency is accessed through a static-looking facade call. |
| Convenience | Requires declaring and injecting the dependency. | Can avoid adding constructor injection for a quick framework-service call. |
| Team conventions | Fits teams that prefer explicit dependencies. | Fits teams that prefer Laravel’s facade style. |
| Context | Useful when an explicit dependency is part of a boundary or class design. | Can be convenient in application code; package authors should also follow package-oriented testing guidance. |
Neither option automatically produces better architecture. Decide whether the dependency should be visible in the constructor, follow established conventions, and keep business boundaries clear. Package development has additional testing considerations; consult Laravel’s package guidance rather than assuming application-level advice covers every package concern.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Test behavior separately from the integration
Test the use case with a fake implementation of its port to check application behavior without making a real external request. Then test the production adapter at an integration boundary, using the project’s chosen strategy for verifying its interaction with the provider. This divides the question “does the application make the right decision?” from “does this adapter communicate correctly?”
Laravel’s service-container documentation notes that injected services can be mocked or replaced with dummy implementations, which supports substituting dependencies during tests. See the container documentation. A simple fake might retain the requested amount and return a stable transaction identifier; the use-case test can assert that the result and relevant application behavior are correct without exercising provider code.
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You do not need to reorganize an entire Laravel codebase before benefiting from this approach. Start where an external dependency changes often, where business behavior deserves focused tests, or where provider details are leaking into application rules. Extract a port, move integration-specific translation into an adapter, bind the implementation, and test the use case with a substitute.
Keep ordinary internal code direct when an interface would add indirection without improving changeability, clarity, or testability. Laravel remains the application’s framework; hexagonal architecture helps ensure that a framework or integration change does not automatically force a rewrite of the rules that matter to the application.
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