PressBooks\Modules\Export\Xhtml\Xhtml11::endnoteShortcode PHP Метод

    function endnoteShortcode($atts, $content = null)
    {
        global $id;
        if (!$content) {
            return '';
        }
        $this->endnotes[$id][] = trim($content);
        return '<sup class="endnote">' . count($this->endnotes[$id]) . '</sup>';
    }