html_classes

New in version 2.12: The html_classes function was added in Twig 2.12.

The html_classes function returns a string by conditionally joining class names together:

<p class="{{ html_classes('a-class', 'another-class', {
    'errored': object.errored,
    'finished': object.finished,
    'pending': object.pending,
}) }}">How are you doing?</p>

Note

The html_classes function is part of the HtmlExtension which is not installed by default. Install it first:

$ composer require twig/html-extra

Then, use the twig/extra-bundle on Symfony projects or add the extension explicitly on the Twig environment:

use Twig\Extra\Html\HtmlExtension;

$twig = new \Twig\Environment(...);
$twig->addExtension(new HtmlExtension());
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https://twig.symfony.com/doc/2.x/functions/html_classes.html