code: public function getCommentBlockIndices(Tokens $tokens, $index)
      {
          if (!$tokens[$index]->isGivenKind(T_COMMENT)) {
              throw new \InvalidArgumentException('Given index must point to a comment.');
          }
  
          $commentType = $this->getCommentType($tokens[$index]->getContent());
          $indices = [$index];
  
          if (self::TYPE_SLASH_ASTERISK === $commentType) {
              return $indices;
          }
  
          $count = \count($tokens);
          ++$index;
  
          for (; $index < $count; ++$index) {
              if ($tokens[$index]->isComment()) {
                  if ($commentType === $this->getCommentType($tokens[$index]->getContent())) {
                      $indices[] = $index;
  
                      continue;
                  }
  
                  break;
              }
  
              if (!$tokens[$index]->isWhitespace() || $this->getLineBreakCount($tokens, $index, $index + 1) > 1) {
                  break;
              }
          }
  
          return $indices;
      }
docs: Return array of indices that are part of a comment started at given index.
  
  @param Tokens $tokens
  @param int    $index  T_COMMENT index
  
  @return null|array