html_classes
html_classes 函数通过有条件地将类名连接在一起来返回字符串
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<p class="{{ html_classes('a-class', 'another-class', {
'errored': object.errored,
'finished': object.finished,
'pending': object.pending,
}) }}">How are you doing?</p>注意
html_classes 函数是 HtmlExtension 的一部分，默认情况下未安装。请先安装它
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$ composer require twig/html-extra然后，在 Symfony 项目上，安装 twig/extra-bundle
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$ composer require twig/extra-bundle否则，在 Twig 环境中显式添加扩展
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use Twig\Extra\Html\HtmlExtension;
$twig = new \Twig\Environment(...);
$twig->addExtension(new HtmlExtension());