openBrowser example

if ($binary === FALSE) {
      throw new \RuntimeException('Unable to find the PHP binary.');
    }

    $io->writeln("<info>Drupal development server started:</info> <http://{$host}:{$port}>");
    $io->writeln('<info>This server is not meant for production use.</info>');
    $one_time_login = "http://$host:$port{$this->getOneTimeLoginUrl()}/login";
    $io->writeln("<info>One time login url:</info> <$one_time_login>");
    $io->writeln('Press Ctrl-C to quit the Drupal development server.');

    if (!$input->getOption('suppress-login')) {
      if ($this->openBrowser("$one_time_login?destination=" . urlencode("/"), $io) === 1) {
        $io->error('Error while opening up a one time login URL');
      }
    }

    // Use the Process object to construct an escaped command line.     $process = new Process([
      $binary,
      '-S',
      $host . ':' . $port,
      '.ht.router.php',
    ], $kernel->getAppRoot(), [], NULL, NULL);