Slim Dependency Injection

When to use

• The user needs to register service definitions in the Slim container so classes get their dependencies.
• The user wants Slim to resolve an invokable controller class from the container instead of a closure.
• The user wants to configure a PSR-11 container for a Slim app via AppFactory::setContainer.

When NOT to use

• Do not reach for this skill to pull services out of the container inside handlers on demand; that is a service-locator anti-pattern, not injection.
• Do not introduce a container for a trivial Slim app with a couple of routes and no shared services.

Core guidance