44How to Write a custom Twig Extension
55====================================
66
7- `Twig Extensions `_ allow to create custom Twig functions, filters and more to
8- use them in your templates.
7+ `Twig Extensions `_ allow to create custom functions, filters and more to use
8+ them in your Twig templates. Before writing your own Twig extension, check if
9+ the filter/function that you need is already implemented in:
910
10- Before writing your own Twig extension, check if the filter/function that you
11- need is already implemented in the `default Twig filters and functions `_ or the
12- :doc: `Twig filters and functions added by Symfony </reference/twig_reference >`.
13- Check also the `official Twig GitHub organization `_, which contains some extra
14- repositories that provide extensions for common needs (such as ``string-extra ``,
15- ``html-extra ``, ``intl-extra ``, etc.)
16-
17- .. code-block :: terminal
18-
19- $ composer require twig/extensions
11+ * The `default Twig filters and functions `_;
12+ * The :doc: `Twig filters and functions added by Symfony </reference/twig_reference >`;
13+ * The `official Twig extensions `_ related to strings, HTML, Markdown, internationalization, etc.
2014
2115Create the Extension Class
2216--------------------------
@@ -178,5 +172,5 @@ for this class and :doc:`tag your service </service_container/tags>` with ``twig
178172
179173.. _`Twig Extensions` : https://twig.symfony.com/doc/2.x/advanced.html#creating-an-extension
180174.. _`default Twig filters and functions` : https://twig.symfony.com/doc/2.x/#reference
181- .. _`official Twig GitHub organization ` : https://github.com/twigphp
175+ .. _`official Twig extensions ` : https://github.com/twigphp?q=extra
182176.. _`global variables` : https://twig.symfony.com/doc/2.x/advanced.html#id1
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