original_string: private static function getProxyString(): ?string
      {
          $proxyString = null;
          if (\getenv('HTTP_CLIENT_IP')) {
              $proxyString = \getenv('HTTP_CLIENT_IP');
          } elseif (\getenv('HTTP_X_FORWARDED_FOR')) {
              $proxyString = \getenv('HTTP_X_FORWARDED_FOR');
          } elseif (\getenv('HTTP_X_FORWARDED')) {
              $proxyString = \getenv('HTTP_X_FORWARDED');
          } elseif (\getenv('HTTP_X_COMING_FROM')) {
              $proxyString = \getenv('HTTP_X_COMING_FROM');
          } elseif (\getenv('HTTP_FORWARDED_FOR')) {
              $proxyString = \getenv('HTTP_FORWARDED_FOR');
          } elseif (\getenv('HTTP_FORWARDED')) {
              $proxyString = \getenv('HTTP_FORWARDED');
          } elseif (\getenv('HTTP_COMING_FROM')) {
              $proxyString = \getenv('HTTP_COMING_FROM');
          }
          return $proxyString;
      }
code: private static function getProxyString(): ?string
      {
          $proxyString = null;
          if (\getenv('HTTP_CLIENT_IP')) {
              $proxyString = \getenv('HTTP_CLIENT_IP');
          } elseif (\getenv('HTTP_X_FORWARDED_FOR')) {
              $proxyString = \getenv('HTTP_X_FORWARDED_FOR');
          } elseif (\getenv('HTTP_X_FORWARDED')) {
              $proxyString = \getenv('HTTP_X_FORWARDED');
          } elseif (\getenv('HTTP_X_COMING_FROM')) {
              $proxyString = \getenv('HTTP_X_COMING_FROM');
          } elseif (\getenv('HTTP_FORWARDED_FOR')) {
              $proxyString = \getenv('HTTP_FORWARDED_FOR');
          } elseif (\getenv('HTTP_FORWARDED')) {
              $proxyString = \getenv('HTTP_FORWARDED');
          } elseif (\getenv('HTTP_COMING_FROM')) {
              $proxyString = \getenv('HTTP_COMING_FROM');
          }
          return $proxyString;
      }
code_tokens: private static function getProxyString ( ) : ? string { $ proxyString = null ; if ( \ getenv ( 'HTTP_CLIENT_IP' ) ) { $ proxyString = \ getenv ( 'HTTP_CLIENT_IP' ) ; } elseif ( \ getenv ( 'HTTP_X_FORWARDED_FOR' ) ) { $ proxyString = \ getenv ( 'HTTP_X_FORWARDED_FOR' ) ; } elseif ( \ getenv ( 'HTTP_X_FORWARDED' ) ) { $ proxyString = \ getenv ( 'HTTP_X_FORWARDED' ) ; } elseif ( \ getenv ( 'HTTP_X_COMING_FROM' ) ) { $ proxyString = \ getenv ( 'HTTP_X_COMING_FROM' ) ; } elseif ( \ getenv ( 'HTTP_FORWARDED_FOR' ) ) { $ proxyString = \ getenv ( 'HTTP_FORWARDED_FOR' ) ; } elseif ( \ getenv ( 'HTTP_FORWARDED' ) ) { $ proxyString = \ getenv ( 'HTTP_FORWARDED' ) ; } elseif ( \ getenv ( 'HTTP_COMING_FROM' ) ) { $ proxyString = \ getenv ( 'HTTP_COMING_FROM' ) ; } return $ proxyString ; }
docstring: Check and returns proxy string
  
  @return null|string
docstring_tokens: Check and returns proxy string