public function add_hook()
{
add_action('init', array($this, 'update_rules'));
add_action('add_option_cptp_version', array($this, 'update_rules'));
add_action('update_option_cptp_version', array($this, 'update_rules'), 20);
add_action('wp_loaded', array(__CLASS__, 'dequeue_flush_rules'), 200);
}