public function cacheModifiedCheck(Smarty_Template_Cached $cached, Smarty_Internal_Template $_template, $content)
    {
        $_isCached = $_template->isCached() && !$_template->compiled->has_nocache_code;
        $_last_modified_date =
            @substr($_SERVER['HTTP_IF_MODIFIED_SINCE'], 0, strpos($_SERVER['HTTP_IF_MODIFIED_SINCE'], 'GMT') + 3);
        if ($_isCached && $cached->timestamp <= strtotime($_last_modified_date)) {
            switch (PHP_SAPI) {
                case 'cgi': // php-cgi < 5.3
                case 'cgi-fcgi': // php-cgi >= 5.3
                case 'fpm-fcgi': // php-fpm >= 5.3.3
                    header('Status: 304 Not Modified');
                    break;

                case 'cli':
                    if ( /* ^phpunit */
                    !empty($_SERVER['SMARTY_PHPUNIT_DISABLE_HEADERS']) /* phpunit$ */
                    ) {
                        $_SERVER['SMARTY_PHPUNIT_HEADERS'][] = '304 Not Modified';
                    }
                    break;

                default:
                    if ( /* ^phpunit */
                    !empty($_SERVER['SMARTY_PHPUNIT_DISABLE_HEADERS']) /* phpunit$ */
                    ) {
                        $_SERVER['SMARTY_PHPUNIT_HEADERS'][] = '304 Not Modified';
                    } else {
                        header($_SERVER['SERVER_PROTOCOL'] . ' 304 Not Modified');
                    }
                    break;
            }
        } else {
            switch (PHP_SAPI) {
                case 'cli':
                    if ( /* ^phpunit */
                    !empty($_SERVER['SMARTY_PHPUNIT_DISABLE_HEADERS']) /* phpunit$ */
                    ) {
                        $_SERVER['SMARTY_PHPUNIT_HEADERS'][] =
                            'Last-Modified: ' . gmdate('D, d M Y H:i:s', $cached->timestamp) . ' GMT';
                    }
                    break;
                default:
                    header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $cached->timestamp) . ' GMT');
                    break;
            }
            echo $content;
        }
    }