phpExcel设置单元格所有加边框

    $styleThinBlackBorderOutline = array(
        'borders' => array(
            'allborders' => array( //设置所有边框
                'style' => \PHPExcel_Style_Border::BORDER_THIN //粗的是thick
            ),

        ),
    );
    $objPHPExcel->getActiveSheet()->getStyle( 'A1:K12')->applyFromArray($styleThinBlackBorderOutline);

　　 说明：将坐标A1 到 K12 的地方所有加边框