How to write a custom Twig Extension should explain how to add a Twig function

[gagarine]

Their is any information on http://symfony.com/doc/current/cookbook/templating/twig_extension.html how to add custom functions (and register global).

Worst, information on http://stackoverflow.com/questions/13277444/using-a-custom-function-in-twig are outdated.

[stof]

Well, it links to the Twig documentation which explains it.

[wouterj]

Closing this. It's documented in the twig docs and our docs contain a link to that. We can't documented features of 3th party stuff, as it makes our docs hard to maintain