code: private function writePageMargins(XMLWriter $objWriter, PhpspreadsheetWorksheet $pSheet)
      {
          // pageMargins
          $objWriter->startElement('pageMargins');
          $objWriter->writeAttribute('left', StringHelper::formatNumber($pSheet->getPageMargins()->getLeft()));
          $objWriter->writeAttribute('right', StringHelper::formatNumber($pSheet->getPageMargins()->getRight()));
          $objWriter->writeAttribute('top', StringHelper::formatNumber($pSheet->getPageMargins()->getTop()));
          $objWriter->writeAttribute('bottom', StringHelper::formatNumber($pSheet->getPageMargins()->getBottom()));
          $objWriter->writeAttribute('header', StringHelper::formatNumber($pSheet->getPageMargins()->getHeader()));
          $objWriter->writeAttribute('footer', StringHelper::formatNumber($pSheet->getPageMargins()->getFooter()));
          $objWriter->endElement();
      }
docs: Write PageMargins.
  
  @param XMLWriter $objWriter XML Writer
  @param PhpspreadsheetWorksheet $pSheet Worksheet