The DependencyInjection component allows you to standardize and centralize the way objects are constructed in your application.
A small PHP 5.3 dependency injection container
The dependency injection container for humans
Flexible, compiled and full-featured Dependency Injection Container with perfectly usable autowiring and support for all new PHP 7 features.
Small but powerful dependency injection container
Dependency Injection System
Dice - a lightweight Dependency Injection Container for PHP
Library for testing user classes related to the Symfony Dependency Injection Component
An introduction to Dependency Injection.