Pressbooks\Modules\Export\Epub\Epub201::createToc PHP Method

    protected function createToc($book_contents, $metadata)
    {
        $vars = array('post_title' => '', 'stylesheet' => $this->stylesheet, 'post_content' => '', 'isbn' => @$metadata['pb_ebook_isbn'], 'lang' => $this->lang);
        $options = get_option('pressbooks_theme_options_global');
        foreach (array('copyright_license') as $requiredGlobalOption) {
            if (!isset($options[$requiredGlobalOption])) {
                $options[$requiredGlobalOption] = 0;
            }
        }
        // Start by inserting self into correct manifest position
        $array_pos = $this->positionOfToc();
        $file_id = 'table-of-contents';
        $filename = "{$file_id}.{$this->filext}";
        $vars['post_title'] = __('Table Of Contents', 'pressbooks');
        $this->manifest = array_slice($this->manifest, 0, $array_pos + 1, true) + array($file_id => array('ID' => -1, 'post_title' => $vars['post_title'], 'filename' => $filename)) + array_slice($this->manifest, $array_pos + 1, count($this->manifest) - 1, true);
        // HTML
        $li_count = 0;
        $i = 1;
        $html = '<div id="toc"><h1>' . __('Contents', 'pressbooks') . '</h1><ul>';
        foreach ($this->manifest as $k => $v) {
            // We only care about front-matter, part, chapter, back-matter
            // Skip the rest
            $subtitle = '';
            $author = '';
            $license = '';
            $title = Sanitize\strip_br($v['post_title']);
            if (preg_match('/^front-matter-/', $k)) {
                $class = 'front-matter ';
                $class .= \Pressbooks\Taxonomy::getFrontMatterType($v['ID']);
                $subtitle = trim(get_post_meta($v['ID'], 'pb_subtitle', true));
                $author = trim(get_post_meta($v['ID'], 'pb_section_author', true));
                $license = $options['copyright_license'] ? get_post_meta($v['ID'], 'pb_section_license', true) : '';
            } elseif (preg_match('/^part-/', $k)) {
                $class = 'part';
                if (get_post_meta($v['ID'], 'pb_part_invisible', true) == 'on') {
                    $class .= ' display-none';
                }
            } elseif (preg_match('/^chapter-/', $k)) {
                $class = 'chapter';
                $class .= \Pressbooks\Taxonomy::getChapterType($v['ID']);
                $subtitle = trim(get_post_meta($v['ID'], 'pb_subtitle', true));
                $author = trim(get_post_meta($v['ID'], 'pb_section_author', true));
                $license = $options['copyright_license'] ? get_post_meta($v['ID'], 'pb_section_license', true) : '';
                if ($this->numbered && \Pressbooks\Taxonomy::getChapterType($v['ID']) !== 'numberless') {
                    $title = " {$i}. " . $title;
                }
                if (\Pressbooks\Taxonomy::getChapterType($v['ID']) !== 'numberless') {
                    ++$i;
                }
            } elseif (preg_match('/^back-matter-/', $k)) {
                $class = 'back-matter ';
                $class .= \Pressbooks\Taxonomy::getBackMatterType($v['ID']);
                $subtitle = trim(get_post_meta($v['ID'], 'pb_subtitle', true));
                $author = trim(get_post_meta($v['ID'], 'pb_section_author', true));
                $license = $options['copyright_license'] ? get_post_meta($v['ID'], 'pb_section_license', true) : '';
            } else {
                continue;
            }
            $html .= sprintf('<li class="%s"><a href="%s"><span class="toc-chapter-title">%s</span>', $class, $v['filename'], Sanitize\decode($title));
            if ($subtitle) {
                $html .= ' <span class="chapter-subtitle">' . Sanitize\decode($subtitle) . '</span>';
            }
            if ($author) {
                $html .= ' <span class="chapter-author">' . Sanitize\decode($author) . '</span>';
            }
            if ($license) {
                $html .= ' <span class="chapter-license">' . $license . '</span> ';
            }
            $html .= '</a>';
            if (\Pressbooks\Modules\Export\Export::isParsingSubsections() == true) {
                $sections = \Pressbooks\Book::getSubsections($v['ID']);
                if ($sections) {
                    $html .= '<ul class="sections">';
                    foreach ($sections as $id => $title) {
                        $html .= '<li class="section"><a href="' . $v['filename'] . '#' . $id . '"><span class="toc-subsection-title">' . Sanitize\decode($title) . '</span></a></li>';
                    }
                    $html .= '</ul>';
                }
            }
            $html .= "</li>\n";
            ++$li_count;
        }
        if (0 == $li_count) {
            $html .= '<li></li>';
        }
        $html .= "</ul></div>\n";
        // Create file
        $vars['post_content'] = $html;
        file_put_contents($this->tmpDir . "/OEBPS/{$filename}", $this->loadTemplate($this->dir . '/templates/epub201/html.php', $vars));
    }