code: protected function applyFix(\SplFileInfo $file, Tokens $tokens)
      {
          $tokenCount = $tokens->count();
  
          for ($index = 1; $index < $tokenCount; ++$index) {
              if (!$tokens[$index]->isGivenKind(T_ISSET) || $tokens[$tokens->getPrevMeaningfulToken($index)]->equals('!')) {
                  continue;
              }
  
              $issetInfo = $this->getIssetInfo($tokens, $index);
              $issetCloseBraceIndex = end($issetInfo); // ')' token
              $insertLocation = prev($issetInfo) + 1; // one index after the previous meaningful of ')'
  
              $booleanAndTokenIndex = $tokens->getNextMeaningfulToken($issetCloseBraceIndex);
  
              while ($tokens[$booleanAndTokenIndex]->isGivenKind(T_BOOLEAN_AND)) {
                  $issetIndex = $tokens->getNextMeaningfulToken($booleanAndTokenIndex);
                  if (!$tokens[$issetIndex]->isGivenKind(T_ISSET)) {
                      $index = $issetIndex;
  
                      break;
                  }
  
                  // fetch info about the 'isset' statement that we're merging
                  $nextIssetInfo = $this->getIssetInfo($tokens, $issetIndex);
  
                  // clone what we want to move, do not clone '(' and ')' of the 'isset' statement we're merging
                  $clones = $this->getTokenClones($tokens, \array_slice($nextIssetInfo, 1, -1));
  
                  // clean up no the tokens of the 'isset' statement we're merging
                  $this->clearTokens($tokens, array_merge($nextIssetInfo, [$issetIndex, $booleanAndTokenIndex]));
  
                  // insert the tokens to create the new statement
                  array_unshift($clones, new Token(','), new Token([T_WHITESPACE, ' ']));
                  $tokens->insertAt($insertLocation, $clones);
  
                  // correct some counts and offset based on # of tokens inserted
                  $numberOfTokensInserted = \count($clones);
                  $tokenCount += $numberOfTokensInserted;
                  $issetCloseBraceIndex += $numberOfTokensInserted;
                  $insertLocation += $numberOfTokensInserted;
  
                  $booleanAndTokenIndex = $tokens->getNextMeaningfulToken($issetCloseBraceIndex);
              }
          }
      }
docs: {@inheritdoc}