static function updateShowTitleOptions()
{
if (check_ajax_referer('pb-update-book-show-title')) {
$post_id = absint($_POST['post_id']);
if (current_user_can('edit_post', $post_id)) {
$valid_meta_keys = array('pb_show_title');
$meta_key = in_array($_POST['type'], $valid_meta_keys) ? $_POST['type'] : false;
if ($meta_key) {
$meta_value = $_POST['chapter_show_title'] ? 'on' : 0;
update_post_meta($post_id, $meta_key, $meta_value);
static::deleteBookObjectCache();
}
}
}
}