code: private function prepareCountryCodes($blockedCountries)
      {
          $result = '';
  
          if ($blockedCountries != null) {
              $blockedCountriesPieces = explode(",", $blockedCountries);
              foreach ($blockedCountriesPieces as $code) {
                  $result .= ' client.geo.country_code == "' . $code . '" ||';
              }
          }
  
          return $result;
      }
docs: Prepares blocked countries VCL snippet
  
  @param $blockedCountries
  @return string