Jetpack::implode_frontend_css PHP Method

    public function implode_frontend_css($travis_test = false)
    {
        $do_implode = true;
        if (defined('SCRIPT_DEBUG') && SCRIPT_DEBUG) {
            $do_implode = false;
        }
        /**
         * Allow CSS to be concatenated into a single jetpack.css file.
         *
         * @since 3.2.0
         *
         * @param bool $do_implode Should CSS be concatenated? Default to true.
         */
        $do_implode = apply_filters('jetpack_implode_frontend_css', $do_implode);
        // Do not use the imploded file when default behaviour was altered through the filter
        if (!$do_implode) {
            return;
        }
        // We do not want to use the imploded file in dev mode, or if not connected
        if (Jetpack::is_development_mode() || !self::is_active()) {
            if (!$travis_test) {
                return;
            }
        }
        // Do not use the imploded file if sharing css was dequeued via the sharing settings screen
        if (get_option('sharedaddy_disable_resources')) {
            return;
        }
        /*
         * Now we assume Jetpack is connected and able to serve the single
         * file.
         *
         * In the future there will be a check here to serve the file locally
         * or potentially from the Jetpack CDN
         *
         * For now:
         * - Enqueue a single imploded css file
         * - Zero out the style_loader_tag for the bundled ones
         * - Be happy, drink scotch
         */
        add_filter('style_loader_tag', array($this, 'concat_remove_style_loader_tag'), 10, 2);
        $version = Jetpack::is_development_version() ? filemtime(JETPACK__PLUGIN_DIR . 'css/jetpack.css') : JETPACK__VERSION;
        wp_enqueue_style('jetpack_css', plugins_url('css/jetpack.css', __FILE__), array(), $version);
        wp_style_add_data('jetpack_css', 'rtl', 'replace');
    }