u

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License

Twig documentation is licensed under the new BSD license.

`u`

The u filter wraps a text in a Unicode object (a Symfony UnicodeString instance) that exposes methods to "manipulate" the string.

Let's see some common use cases.

Wrapping a text to a given number of characters:

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        {{ 'Symfony String + Twig = <3'|u.wordwrap(5) }}
Symfony
String
+
Twig
= <3
    

Here, u is the filter and wordwrap(5) is a method called on the result of the filter; it's equivalent to (text|u).wordwrap(5).

Truncating a string:

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        {{ 'Lorem ipsum'|u.truncate(8) }}
Lorem ip

{{ 'Lorem ipsum'|u.truncate(8, '...') }}
Lorem...
    

The truncate method also accepts a third argument to preserve whole words:

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        {{ 'Lorem ipsum dolor'|u.truncate(10, '...', false) }}
Lorem ipsum...
    

Converting a string to snake case or camelCase:

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        {{ 'SymfonyStringWithTwig'|u.snake }}
symfony_string_with_twig

{{ 'symfony_string with twig'|u.camel.title }}
SymfonyStringWithTwig
    

You can also chain methods:

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        {{ 'Symfony String + Twig = <3'|u.wordwrap(5).upper }}
SYMFONY
STRING
+
TWIG
= <3
    

Note

The u filter is part of the StringExtension which is not installed by default. Install it first:

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        $ composer require twig/string-extra
    

Then, on Symfony projects, install the twig/extra-bundle:

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        $ composer require twig/extra-bundle
    

Otherwise, add the extension explicitly on the Twig environment:

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        use Twig\Extra\String\StringExtension;

$twig = new \Twig\Environment(...);
$twig->addExtension(new StringExtension());
    