public function exportExcel(){
    require_once 'include/PHPExcel.php';
    $objPHPExcel = new PHPExcel();      //实例化Excel类
    //第一个sheet填入主标题
    $first_sheet_title = '入职';
    $objPHPExcel->getActiveSheet()->setCellValue('A1', $title.$first_sheet_title);
    //合并单元格
    $objPHPExcel->getActiveSheet()->mergeCells('A1:D1');
    //设置居中
    $objPHPExcel->getActiveSheet()->getStyle('A1:D1')->getAlignment()->setHorizontal(PHPExcel_Style_Alignment::HORIZONTAL_CENTER);
 
    //设置单元格宽
    $objPHPExcel->getActiveSheet()->getColumnDimension('A')->setWidth(6);
    $objPHPExcel->getActiveSheet()->getColumnDimension('B')->setWidth(15);
    $objPHPExcel->getActiveSheet()->getColumnDimension('C')->setWidth(15);
    $objPHPExcel->getActiveSheet()->getColumnDimension('D')->setWidth(15);
    $objPHPExcel->getActiveSheet()->getColumnDimension('E')->setWidth(15);
    //字体加粗
    $objPHPExcel->getActiveSheet()->getStyle('A1')->getFont()->setName('宋体') //字体
    ->setBold(true); //字体加粗
    $objPHPExcel->getActiveSheet()->getStyle('A2')->getFont()->setName('宋体') //字体
    ->setBold(true); //字体加粗
    $objPHPExcel->getActiveSheet()->getStyle('B2')->getFont()->setName('宋体') //字体
    ->setBold(true); //字体加粗
    $objPHPExcel->getActiveSheet()->getStyle('C2')->getFont()->setName('宋体') //字体
    ->setBold(true); //字体加粗
    $objPHPExcel->getActiveSheet()->getStyle('D2')->getFont()->setName('宋体') //字体
    ->setBold(true); //字体加粗
    $objPHPExcel->getActiveSheet()->getStyle('E2')->getFont()->setName('宋体') //字体
    ->setBold(true); //字体加粗
    //第一sheet入职
    $array = array(
            array("序号","部门","职位","姓名",'入职时间'),
    );
    $field = "id,department,post_title,real_name,CONCAT(entry_date_Y,'-',entry_date_M,'-',entry_date_D) as date";
    //入职人员：入职时间+3个月时间 > 当前时间
    $thirty_month = 3*30*24*3600;
    $where = " unix_timestamp(now()) < UNIX_TIMESTAMP(CONCAT(entry_date_Y,'-',entry_date_M,'-',entry_date_D))+$thirty_month ".$where_1;
    $array1 = M('files')->field($field)->where($where)->select();
    $data = array();
    if(is_array($array1)){
        foreach($array1 as $key=>$value){
            $data[$key][]=$value['id'];
            $data[$key][]=$value['department'];
            $data[$key][]=$value['post_title'];
            $data[$key][]=$value['real_name'];
            $data[$key][]=$value['date'];
        }
    }
    //合并title
    $new_arr = array_merge($array,$data);
 
    //写入到第一个sheet
    $k = 1;
    foreach ($new_arr as $val){
        $k = $k+1;
        $objPHPExcel->getactivesheet()->setcellvalue('A'.$k, $val[0]);//第A列 第$k行  
        $objPHPExcel->getactivesheet()->setcellvalue('B'.$k, $val[1]);
        $objPHPExcel->getactivesheet()->setcellvalue('C'.$k, $val[3]);
        $objPHPExcel->getactivesheet()->setcellvalue('D'.$k, $val[4]);
        $objPHPExcel->getactivesheet()->setcellvalue('E'.$k, $val[5]);
    }
 
    /*保存到第一个sheet*/
    $objPHPExcel->getActiveSheet()->setTitle($first_sheet_title);
    // Set active sheet index to the first sheet, so Excel opens this as the first sheet
    $objPHPExcel->setActiveSheetIndex(0);
    //第一sheet入职 -end
 
 
 
    //第二sheet转正
    $objPHPExcel->createSheet();
    $objPHPExcel->setActiveSheetIndex(1);
    $second = 1;
    $sheet_title = '转正';
    $A1_title = $title;
    $A2_title = array(
            array("序号","部门","职位","姓名",'入职时间','转正时间'),
    );
    $where  = 'transfer_type = 6';
    $where .= $where_2;
    $this->makeData($objPHPExcel,$second,$sheet_title,$A1_title,$A2_title,$where);
    //写入到第二个sheet-end
    
    
    //最后通过浏览器输出
    $fn = getUniName()."导出信息.xls"; 
    header('Content-Type: application/vnd.ms-excel; charset=utf-8');
    header("Content-Disposition: attachment;filename=$fn");
    header('Cache-Control: max-age=0');
    $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel5');
    $objWriter->save('php://output');
    exit;
}
 
        
/*
 * 封装
 * @ $objPHPExcel   phpexcel 对象
 * @ $num  int       第n个工作空间
 * @ $sheet_title    工作空间sheet名称
 * @ param string   $A1_title 大标题
 * @ param array    $A2_title 每个字段名
 * @ where sting or array 查询的条件
 * @ return true or false;
 */
protected  function makeData($objPHPExcel,$num,$sheet_title,$A1_title,$A2_title,$where){
    $objPHPExcel->createSheet();
    $objPHPExcel->setActiveSheetIndex($num);
    $objPHPExcel->getActiveSheet()->setCellValue('A1', $A1_title);
    //合并单元格
    $objPHPExcel->getActiveSheet()->mergeCells('A1:F1');
    //设置居中
    $objPHPExcel->getActiveSheet()->getStyle('A1:F1')->getAlignment()->setHorizontal(PHPExcel_Style_Alignment::HORIZONTAL_CENTER);
    
    //设置单元格宽
    $objPHPExcel->getActiveSheet()->getColumnDimension('A')->setWidth(6);
    $objPHPExcel->getActiveSheet()->getColumnDimension('B')->setWidth(15);
    $objPHPExcel->getActiveSheet()->getColumnDimension('C')->setWidth(15);
    $objPHPExcel->getActiveSheet()->getColumnDimension('D')->setWidth(15);
    $objPHPExcel->getActiveSheet()->getColumnDimension('E')->setWidth(15);
    $objPHPExcel->getActiveSheet()->getColumnDimension('F')->setWidth(15);
    //字体加粗
    $objPHPExcel->getActiveSheet()->getStyle('A1')->getFont()->setName('宋体') //字体
    ->setBold(true); //字体加粗
    $objPHPExcel->getActiveSheet()->getStyle('A2')->getFont()->setName('宋体') //字体
    ->setBold(true); //字体加粗
    $objPHPExcel->getActiveSheet()->getStyle('B2')->getFont()->setName('宋体') //字体
    ->setBold(true); //字体加粗
    $objPHPExcel->getActiveSheet()->getStyle('C2')->getFont()->setName('宋体') //字体
    ->setBold(true); //字体加粗
    $objPHPExcel->getActiveSheet()->getStyle('D2')->getFont()->setName('宋体') //字体
    ->setBold(true); //字体加粗
    $objPHPExcel->getActiveSheet()->getStyle('E2')->getFont()->setName('宋体') //字体
    ->setBold(true); //字体加粗
    $objPHPExcel->getActiveSheet()->getStyle('F2')->getFont()->setName('宋体') //字体
    ->setBold(true); //字体加粗
    
    
    $field = "id,department_at,post_title_at,real_name,CONCAT(entry_date_Y,'-',entry_date_M,'-',entry_date_D) date_1,CONCAT(effective_date_Y,'-',effective_date_M,'-',effective_date_D) date_2";
    // transfer_type 调动类型，1为调岗，2为晋升，3为加薪，4为降职，5为离职,6为转正
    $array_3 = M('fer')->field($field)->where($where)->select();
    $data = array();
    if(is_array($array_3)){
        foreach($array_3 as $key=>$value){
            $data[$key][]=$value['id'];
            $data[$key][]=$value['department'];
            $data[$key][]=$value['post_title'];
            $data[$key][]=$value['real_name'];
            $data[$key][]=$value['date_1'];
            $data[$key][]=$value['date_2'];
        }
    }
    $new_arr = array_merge($A2_title,$data);
    //写入到第n个sheet
    $i = 1;
    foreach ($new_arr as $val){
        $i = $i+1;
        $objPHPExcel->getactivesheet()->setcellvalue('A'.$i, $val[0]);//第A列 第$k行
        $objPHPExcel->getactivesheet()->setcellvalue('B'.$i, $val[1]);
        $objPHPExcel->getactivesheet()->setcellvalue('C'.$i, $val[2]);
        $objPHPExcel->getactivesheet()->setcellvalue('D'.$i, $val[3]);
        $objPHPExcel->getactivesheet()->setcellvalue('E'.$i, $val[4]);
        $objPHPExcel->getactivesheet()->setcellvalue('F'.$i, $val[5]);
    }
    $objWriter=PHPExcel_IOFactory::createWriter($objPHPExcel,"Excel2007");
    /*保存到本地*/
    $objPHPExcel->getActiveSheet()->setTitle($sheet_title);
    return true;
}

原文：https://blog.csdn.net/u011341352/article/details/70211962