PHPExcel 导出可选 sheet

/* 
 * 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) as date_1,CONCAT(effective_date_Y,'-',effective_date_M,'-',effective_date_D) as 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]);  
    }  
    // 生成2007Excel文件（.xlsx）
    $objWriter=PHPExcel_IOFactory::createWriter($objPHPExcel,"Excel2007");  
    /*保存到本地*/  
    $objPHPExcel->getActiveSheet()->setTitle($sheet_title);  
    return true;  
} 

实例化上面的方法之后，可选择输出到浏览器

    $fn = getUniName()."导出信息.xls";   
    header('Content-Type: application/vnd.ms-excel; charset=utf-8');  
    header("Content-Disposition: attachment;filename=$fn");  
    header('Cache-Control: max-age=0');  
    $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel2007');  
    $objWriter->save('php://output');  
    exit;