Attention

TYPO3 v12 has reached end-of-life as of April 30th 2026 and is no longer being maintained. Use the version switcher on the top left of this page to select documentation for a supported version of TYPO3.

Need more time before upgrading? You can purchase Extended Long Term Support (ELTS) for TYPO3 v12 here: TYPO3 ELTS.

Events and hooks

Events and hooks provide an easy way to extend the functionality of the TYPO3 Core and its extensions without blocking others to do the same.

Changed in version 12.0

Signals and slots and all related classes have been removed from the Core. Use PSR-14 events instead.

Contents: