社团活动报名简要代码

简要前端：
<div>
    <div id="title">社团活动报名系统</div>
    <div>
        <form action="{:url('index/baoming')}" METHOD="post"  ACCEPT-CHARSET="utf-8">
        <table  width="20%" border="0" cellpadding="0" cellspacing="2" align='center' valign='middle'>
            <tr>
                <td>姓名:</td>
                <td><input type="text"  name="username"></td>
            </tr>
            <tr>
                <td>手机号:</td>
                <td><input type="text"  name="tel"></td>
            </tr>
            <tr>
                <td>邮箱:</td>
                <td><input type="text"  name="email"></td>
            </tr>
            <tr>
                <td>专业:</td>
                <td><input type="text"  name="subject"></td>
            </tr>
            <tr>
                <td>学号:</td>
                <td><input type="text"  name="studentid"></td>
            </tr>
            <tr>
                <td height="26" colspan="2" align="center" valign="middle"><input type="submit" name="tijiao" value="报名" style="width:60px; height:30px" ></td>
            </tr>
        </table>
        </form>
        <div id="excel">
            <a style="text-decoration:none"  href="{:url('excel')}" class="btn btn-info radius" id="daochu"><i class="fa fa-search"></i>导出数据</a>
        </div>
    </div>
</div>

    public function baoming()
    {
        $request=request();
        $username = $request->param('username');
        $tel = $request->param('tel');
        $email = $request->param('email');
        $subject = $request->param('subject');
        $studentid = $request->param('studentid');

        $data =[
            'username'=>$username,
            'tel'=>$tel,
            'email'=>$email,
            'subject'=>$subject,
            'studentid'=>$studentid
            ];
        $a = Db::table('user')->insert($data);

        $b = Db::table('user')->getLastInsID();
        if($a){
           $this->success('报名成功,您的识别码为：0000'.$b);
        }
        else{
            echo '输入信息有误';
        }

    }

public function excel()
    {
        //导出
        //##########################################################################
        $list = Db::name("user")->select();
        $file_name = date('Y-m-d_His').'.xls';
        $path = dirname(__FILE__);
        Loader::import('PHPExcel.Classes.PHPExcel');
        Loader::import('PHPExcel.Classes.PHPExcel.IOFactory.PHPExcel_IOFactory');

        $PHPExcel = new \PHPExcel();
        // print_r($PHPExcel);die;
        $PHPSheet = $PHPExcel->getActiveSheet();
        $PHPSheet->setTitle("报名信息");
        $PHPSheet->setCellValue("A1","ID");
        $PHPSheet->setCellValue("B1","姓名");
        $PHPSheet->setCellValue("C1","手机号");
        $PHPSheet->setCellValue("D1","邮箱");
        $PHPSheet->setCellValue("E1","专业");
        $PHPSheet->setCellValue("F1","学号");
        $i = 2;
        foreach($list as $key => $value){
            $PHPSheet->setCellValue('A'.$i,''.$value['Id']);
            $PHPSheet->setCellValue('B'.$i,''.$value['username']);
            $PHPSheet->setCellValue('C'.$i,''.$value['tel']);
            $PHPSheet->setCellValue('D'.$i,''.$value['email']);
            $PHPSheet->setCellValue('E'.$i,''.$value['subject']);
            $PHPSheet->setCellValue('F'.$i,''.$value['studentid']);
            $i++;
        }
        $PHPWriter = \PHPExcel_IOFactory::createWriter($PHPExcel,"Excel2007");
        header('Content-Disposition: attachment;filename='.$file_name);
        header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
        $PHPWriter->save("php://output");
    }