Docs for Twig version 3.x
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Twig Documentation

Read the online documentation to learn more about Twig.

Twig Reference

Browse the online reference to learn more about built-in features.

Tip

Use short URLs to quickly find docs for any built-in tag, filter, function, or test:https://twig.symfony.com/XXX.

in
is
Math (+, -, /, %, //, *, **)
Logic (and, or, not, (), b-and, b-xor, b-or)
Comparisons (==, !=,<, >, >=,<=,===,
starts with, ends with, has some, has every, matches)
Others (.., |, ~, ., [], ?:, ??)

Symfony provides many more features via thesymfony/twig-bridge Composer package.