Introduced in version 10.0
The aforementioned goal to use robust and established standards and PHP packages throughout the TYPO3 core is also evident in another area of paramount importance: “dependency injection” (DI). This technique comes into play when one object supplies the dependencies of another object. PHP objects that do not contain state are called services and are logically encapsulated in service containers.
By applying Symfony’s Service Containers architecture we take dependency management and dependency injection for PHP classes to a new level. This approach aims to replace the Extbase dependency injection container and object manager which means we can do without both GeneralUtility::makeInstance() to retrieve singletons and static methods like getInstance() in the future.
Developers are encouraged to read the Symfony documentation and to keep an eye on the PSR-11 Initiative and its sub-tasks.