KnowbaseItem::getAnswer PHP Method

    public function getAnswer()
    {
        if (KnowbaseItemTranslation::canBeTranslated($this)) {
            $answer = KnowbaseItemTranslation::getTranslatedValue($this, 'answer');
        } else {
            $answer = $this->fields["answer"];
        }
        $answer = Toolbox::unclean_html_cross_side_scripting_deep($answer);
        $callback = function ($matches) {
            //1 => tag name, 2 => existing attributes, 3 => title contents
            $tpl = '<%tag%attrs id="%slug"><a href="#%slug">%icon</a>%title</%tag>';
            $title = str_replace(['%tag', '%attrs', '%slug', '%title', '%icon'], [$matches[1], $matches[2], Toolbox::slugify($matches[3]), $matches[3], '<svg aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"/></svg>'], $tpl);
            return $title;
        };
        $pattern = '|<(h[1-6]{1})(.?[^>])?>(.+)</h[1-6]{1}>|';
        $answer = preg_replace_callback($pattern, $callback, $answer);
        return $answer;
    }