code: private function isEndOfLine($i) {
          $ch = $this->data[$i];
  
          if ($this->getLineEndingModeCrlf()) {
              if ($ch=="\r") {
                  $more_ch = $i + 1 < strlen($this->data);
  
                  if ($more_ch) {
                      $next_n = $this->data[$i + 1] == "\n";
  
                      if ($next_n) return true;
                  }
              }
          } else {
              if ($ch=="\n") return true;
          }
          return false;
      }
docs: Checks if the data at the index is on an EOL marker.
  
  @param $i The index on which to check
  @return bool true if the index points to an EOL marker, false otherwise
  
  @internal