headings = array(); $used = array(); $content = preg_replace_callback('/]*)>(.*?)<\/h\1>/is', function ($m) use (&$used) { $level = (int) $m[1]; $attrs = $m[2]; $inner = $m[3]; $text = trim(wp_strip_all_tags($inner)); if ($text === '') return $m[0]; // Build a unique id $base = $this->slugify($text); $id = $base; $i = 2; while (isset($used[$id])) { $id = $base . '-' . $i; $i++; } $used[$id] = true; $this->headings[] = array('level' => $level, 'text' => $text, 'id' => $id); // Only add id if the heading doesn't already have one if (stripos($attrs, 'id=') !== false) { return $m[0]; } return '' . $inner . ''; }, $content); return $content; } public function render_toc() { if (count($this->headings) < 2) return ''; $out = ''; return $out; } public function shortcode($atts) { // Ensure content has been processed so headings are collected. if (empty($this->headings) && is_singular()) { $post = get_queried_object(); if ($post && isset($post->post_content)) { $this->process($post->post_content); } } return $this->render_toc(); } public function styles() { echo "\n\n"; } } add_action('init', array('CA_Table_Of_Contents', 'init'));