Contao\Messages::versionCheck PHP Метод

    public function versionCheck()
    {
        $cache = \System::getContainer()->get('contao.cache');
        if (!$cache->contains('latest-version')) {
            return '';
        }
        $strVersion = $cache->fetch('latest-version');
        if ($strVersion && version_compare(VERSION . '.' . BUILD, $strVersion, '<')) {
            $this->import('BackendUser', 'User');
            if ($this->User->hasAccess('maintenance', 'modules')) {
                return '<p class="tl_new"><a href="contao/main.php?do=maintenance">' . sprintf($GLOBALS['TL_LANG']['MSC']['updateVersion'], $strVersion) . '</a></p>';
            } else {
                return '<p class="tl_new">' . sprintf($GLOBALS['TL_LANG']['MSC']['updateVersion'], $strVersion) . '</p>';
            }
        }
        return '';
    }