public static function init() { add_filter('theme_options_save', __CLASS__ . '::options_save'); add_filter('theme_options_default', __CLASS__ . '::options_default'); add_action('base_settings', __CLASS__ . '::display_backend'); if (theme_functions::$link_target !== self::get_target()) { theme_functions::$link_target = self::get_target(); } }