สอบถามเรื่อง PHPexcel ครับ มัป๊ญหาเรื่องการสร้าง border

$excel = new PHPExcel();
$sheet = $excel->getActiveSheet();

$sheet->getStyle('A1')->applyFromArray(array(
    'borders' => array(
        'left' => array(
            'style' => PHPExcel_Style_Border::BORDER_THICK,
            'color' => array(
                'rgb' => 'FF0000',
            ),
        ),
    ),
));

$writer = new PHPExcel_Writer_Excel2007($excel);
$writer->save('test.xlsx');

$styleArray = array(
  'borders' => array(
    'allborders' => array(
      'style' => PHPExcel_Style_Border::BORDER_THIN
    )
  )
);

$objPHPExcel->getActiveSheet()->getStyle('A1:B2')->applyFromArray($styleArray);
unset($styleArray);