code: private function hasChangingContent(Tokens $tokens)
      {
          static $operatorsPerId = [
              T_DEC,
              T_INC,
              T_STRING,
              T_YIELD,
          ];
  
          foreach ($tokens as $token) {
              if ($token->isGivenKind($operatorsPerId) || $token->equals('(')) {
                  return true;
              }
          }
  
          return false;
      }
docs: Check if the `isset()` content may change if called multiple times.
  
  @param Tokens $tokens The original token list
  
  @return bool