symfony:interfaces-and-autowiring

Interface binding in Symfony maps an abstraction to a concrete class by configuring the service container, allowing autowiring to resolve the correct implementation automatically when the interface is type-hinted.

Service decoration is the best way to extend a Symfony service, allowing you to wrap an existing service with new logic while preserving the original implementation and maintaining core application stability.

Autowiring with tagged services automatically collects and injects all services sharing a common tag, typically grouping multiple implementations of a single interface into an iterator for streamlined dependency management.

You need interface binding when decoupling your architecture, allowing you to swap implementations easily for testing or production changes without modifying the consuming services that rely on the interface abstraction.

Yes, you can use readonly properties with constructor injection in Symfony services to enforce immutability, ensuring that dependencies remain unchanged after instantiation for robust service management.

Symfony recommends minimal interfaces to prevent tight coupling, ensuring that service contracts remain narrow and focused, which simplifies dependency injection and makes architectural refactoring safer.