public function display_thread_page() { $thread_id = null; if (isset($_POST['thread_id'])) { $thread_id = htmlspecialchars($_POST['thread_id']); } $thread_list = $this->models->get_thread_list($thread_id); $max = ceil(count($thread_list) / $this->disp_num); return Page::paging_thread($this->page, $max); }