code: private function findNonBlankLine(DocBlock $doc, $after)
      {
          foreach ($doc->getLines() as $index => $line) {
              if ($index <= $after) {
                  continue;
              }
  
              if ($line->containsATag() || $line->containsUsefulContent() || $line->isTheEnd()) {
                  return $index;
              }
          }
      }
docs: @param DocBlock $doc
  @param int      $after
  
  @return null|int