code: private function renderRow(array $row)
      {
          $output = [];
          $output[] = $this->charVertical;
          $columnNumber = 0;
          foreach ($row as $column => $value) {
              $output[] = $this->renderCell($columnNumber, $value, ' ');
              $output[] = $this->charVertical;
              $columnNumber++;
          }
          return implode('', $output);
      }
docs: Render row.
  
  @param array $row
  @return string