Pressbooks\Modules\Export\Mpdf\Pdf::addFrontMatter PHP Method

    function addFrontMatter(array $contents)
    {
        $first_iteration = true;
        $page_options = array('pagenumstyle' => 'i', 'margin-left' => 15, 'margin-right' => 15);
        foreach ($contents as $front_matter) {
            // safety
            $type = \Pressbooks\Taxonomy::getFrontMatterType($front_matter['ID']);
            if ('dedication' == $type || 'epigraph' == $type || 'title-page' == $type || 'before-title' == $type) {
                continue;
                // Skip
            }
            // only reset the page number on first iteration
            true == $first_iteration ? $page_options['resetpagenum'] = 1 : ($page_options['resetpagenum'] = 0);
            // assumes the array of book contents is in order
            if ('front-matter' != $front_matter['post_type']) {
                return;
            }
            if (!empty($front_matter['post_content'])) {
                $this->addPage($front_matter, $page_options, true, true);
                $first_iteration = false;
            }
        }
    }