code: public static function createServerSocket($socketAddress, $socketContext = null)
      {
          try {
              return self::doCreateServerSocket($socketAddress, $socketContext);
          } catch (Exception\BindOrListenException $e) {
              if (($socketFile = IdentificationHelper::getSocketFile($socketAddress)) !== null) {
                  try {
                      fclose(self::createClientSocket($socketAddress, 1, $socketContext));
                      // Really in use
                      throw $e;
                  } catch (Exception\ConnectException $e2) {
                      // False positive due to a residual socket file
                      unlink($socketFile);
  
                      return self::doCreateServerSocket($socketAddress, $socketContext);
                  }
              } else {
                  throw $e;
              }
          }
      }
docs: @param string        $socketAddress
  @param resource|null $socketContext
  
  @throws Exception\BindOrListenException
  
  @return resource