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201 Symfony-Interview Questions and Answers 2024
What is Dependency Injection, and how does Symfony implement it?

What is Dependency Injection, and how does Symfony implement it?

Answer: Dependency Injection (DI) is a design pattern that allows a class to receive its dependencies from an external source rather than creating them internally, promoting loose coupling and easier testing.

In Symfony, Dependency Injection is implemented through the service container, which manages the instantiation and configuration of services. Developers define services in configuration files (like YAML, XML, or PHP attributes), and Symfony automatically injects dependencies into these services when they are instantiated. This is often done via constructor injection, setter injection, or method injection, allowing for better organization and management of dependencies in an application.

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