Issue #3228576 by Dave Reid: Fix variable errors when including settings file the second time

    $app_root = $this->kernel->getAppRoot();

    $site_path = $this->kernel->getSitePath();

    if (is_readable($app_root . '/' . $site_path . '/settings.php')) {

      // Reset the "global" variables expected to exist for settings.

      $settings = [];

      $config = [];

      $databases = [];

      require $app_root . '/' . $site_path . '/settings.php';

    }