Twinkle

Contextual Binding for Better Dependency Injection

When working with Laravel's service container, you can use contextual binding to inject different implementations of an interface based on which class is requesting it:

$this->app->when(PhotoController::class)
          ->needs(StorageInterface::class)
          ->give(CloudStorage::class);

$this->app->when(DocumentController::class)
          ->needs(StorageInterface::class)
          ->give(LocalStorage::class);

This approach allows you to maintain clean dependency injection in your classes while letting the container handle the complexity of determining which implementation to provide. Your controllers can simply type-hint the interface in their constructors, and Laravel will automatically inject the appropriate implementation based on the context.