php excel,该如何处理

php excel
<?php
error_reporting(E_ALL);
date_default_timezone_set('Europe/London');
/** PHPExcel */
require_once '../Classes/PHPExcel.php';

// Create new PHPExcel object
$objPHPExcel = new PHPExcel();

// Set properties
$objPHPExcel->getProperties()->setCreator("Maarten Balliauw")
                             ->setLastModifiedBy("Maarten Balliauw")
                             ->setTitle("Office 2007 XLSX Test Document")
                             ->setSubject("Office 2007 XLSX Test Document")
                             ->setDescription("Test document for Office 2007 XLSX, generated using PHP classes.")
                             ->setKeywords("office 2007 openxml php")
                             ->setCategory("Test result file");
$objPHPExcel->getActiveSheet()->mergeCells('A1:G1');
$objPHPExcel->getActiveSheet()->mergeCells('H1:W1');
$objPHPExcel->getActiveSheet()->getStyle('A1')->getAlignment()->setHorizontal(PHPExcel_Style_Alignment::HORIZONTAL_CENTER);
$objPHPExcel->getActiveSheet()->getStyle('H1')->getAlignment()->setHorizontal(PHPExcel_Style_Alignment::HORIZONTAL_CENTER);
$objPHPExcel->getActiveSheet()->getColumnDimension('C')->setAutoSize(true);
$objPHPExcel->getActiveSheet()->getColumnDimension('A')->setWidth(20);
$objPHPExcel->getActiveSheet()->getColumnDimension('E')->setWidth(20);

// Add some data


$objPHPExcel->setActiveSheetIndex(0)
            ->setCellValue('A1', 'user-data')
            ->setCellValue('A2', 'username')
            ->setCellValue('B2', 'password')
            ->setCellValue('C2', 'sex')
            ->setCellValue('D2', 'grade')
            ->setCellValue('E2', 'age')
            ->setCellValue('F2', 'weight')
            ->setCellValue('G2', 'height')
            ->setCellValue('H1', 'Module1')
            ->setCellValue('I2', 'Q2')
            ->setCellValue('J2', 'Q3')
            ->setCellValue('K2', 'Q4')
            ->setCellValue('L2', 'Q5')
            ->setCellValue('M2', 'Q6')
            ->setCellValue('N2', 'Q7')
            ->setCellValue('O2', 'Q2')
            ->setCellValue('P2', 'Q3')
            ->setCellValue('Q2', 'Q4')
            ->setCellValue('R2', 'Q5')
            ->setCellValue('S2', 'Q6')
            ->setCellValue('T2', 'Q7')
            ->setCellValue('U2', 'Q2')
            ->setCellValue('V2', 'Q3')
            ->setCellValue('W2', 'Q4')
            ->setCellValue('X1', 'Module2')
            ->setCellValue('Y2', 'Q1')
            ->setCellValue('Z2', 'Q2');    

//数据库连接
$db = mysql_connect("localhost", "root", "");
mysql_select_db("test",$db);  //选择数据库，这里为"ywcl"。
mysql_query("SET NAMES UTF8"); //设定编码方式为UTF8

$sqlgroups="select * from user order by username";
$resultgroups=mysql_query($sqlgroups);