Symfony\Installer\DownloadCommand::checkInstallerVersion PHP Метод

    protected function checkInstallerVersion()
    {
        // check update only if installer is running via a PHAR file
        if ('phar://' !== substr(__DIR__, 0, 7)) {
            return $this;
        }
        if (!$this->isInstallerUpdated()) {
            $this->output->writeln(sprintf("\n <bg=red> WARNING </> Your Symfony Installer version (%s) is outdated.\n" . ' Execute the command "%s selfupdate" to get the latest version (%s).', $this->localInstallerVersion, $_SERVER['PHP_SELF'], $this->latestInstallerVersion));
        }
        return $this;
    }