Airplane_Mode_Core::toggle_css PHP Method

        public function toggle_css()
        {
            // Don't display CSS on the front-end if the admin bar is not loading.
            if (!is_admin() && !is_admin_bar_showing()) {
                return;
            }
            // Set a suffix for loading the minified or normal.
            $file = defined('SCRIPT_DEBUG') && SCRIPT_DEBUG ? 'airplane-mode.css' : 'airplane-mode.min.css';
            // Set a version for browser caching.
            $vers = defined('SCRIPT_DEBUG') && SCRIPT_DEBUG ? time() : AIRMDE_VER;
            // Load the CSS file itself.
            wp_enqueue_style('airplane-mode', plugins_url('/lib/css/' . $file, __FILE__), array(), $vers, 'all');
        }