code: protected function applyFix(\SplFileInfo $file, Tokens $tokens)
      {
          foreach ($tokens as $index => $token) {
              if (!$token->isNativeConstant()) {
                  continue;
              }
  
              if (
                  $this->isNeighbourAccepted($tokens, $tokens->getPrevMeaningfulToken($index)) &&
                  $this->isNeighbourAccepted($tokens, $tokens->getNextMeaningfulToken($index))
              ) {
                  $tokens[$index] = new Token([$token->getId(), strtolower($token->getContent())]);
              }
          }
      }
docs: {@inheritdoc}