Twig/extra/cssinliner-extra/CssInlinerExtension.php

<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Twig\Extra\CssInliner;

use TijsVerkoyen\CssToInlineStyles\CssToInlineStyles;
use Twig\Extension\AbstractExtension;
use Twig\TwigFilter;

class CssInlinerExtension extends AbstractExtension
{
    public function getFilters()
    {
        return [
            new TwigFilter('inline_css', 'Twig\\Extra\\CssInliner\\twig_inline_css', ['is_safe' => ['all']]),
        ];
    }
}

function twig_inline_css(string $body, string ...$css): string
{
    static $inliner;
    if (null === $inliner) {
        $inliner = new CssToInlineStyles();
    }

    return $inliner->convert($body, implode("\n", $css));
}