[TYPO3-core] Signals vs. Hooks

Philipp Gampe philipp.gampe at typo3.org
Mon Aug 25 18:46:54 CEST 2014

Hi Markus,

Markus Klein wrote:

> The new hook mechanism shall be based on Interfaces and shall allow data
> manipulation (preferably via data objects

Careful with that one. You might get what you ask for ;) We had this before 
(interfaces on hooks). This breaks all extensions subscribing to a hook as 
soon as you have to modify the list of arguments. Or to state that 
otherwise: As soon as you use interfaces on hook data, you must never ever 
change the hook again.
This makes refactoring a nightmare. And it is against the design principle 
of PHP.

I am really a fan of the simple DTO data structure that is part of the PHP 
core: array(). We should make is of this in such situations.

Best regards
Philipp Gampe – PGP-Key 0AD96065 – TYPO3 UG Bonn/Köln
Documentation – Active contributor TYPO3 CMS
TYPO3 .... inspiring people to share!

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