ช่วยแนะนำเรื่องการทำ report to excel หน่อยนะครับ ^^

$objPHPExcel = new PHPExcel();
header('Content-Type: application/vnd.ms-excel');
header('Content-Disposition: attachment;filename="your_name.xls"');
header('Cache-Control: max-age=0');  

$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel2007');		
// This line will force the file to download    
$objWriter->save('php://output');

$strFileName = "save/myData.xlsx";    #<------------พาทที่คุณต้องการบันทึก
$objWriter->save($strFileName);

$part = $_POST['part']; #<------------พาทที่คุณต้องการบันทึก ซึ่งรับชื่อโฟลเดอร์จากฟอร์ม หรืออะไรก็ว่าไป

$strFileName = "$part/myData.xlsx";    
$objWriter->save($strFileName);

<?php
/**
 * PHPExcel
 *
 * Copyright (C) 2006 - 2011 PHPExcel
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * @category   PHPExcel
 * @package    PHPExcel
 * @copyright  Copyright (c) 2006 - 2011 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
 * @version    1.7.6, 2011-02-27
 */

/** Error reporting */
error_reporting(E_ALL);

date_default_timezone_set('Europe/London');

/** PHPExcel */
require_once ('PHPExcel/Classes/PHPExcel.php');


// Create new PHPExcel object
//echo date('H:i:s') . " Create new PHPExcel object\n";
$objPHPExcel = new PHPExcel();

// Set properties
//echo date('H:i:s') . " Set properties\n";
$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");


// Add some data
//echo date('H:i:s') . " Add some data\n";
$objPHPExcel->setActiveSheetIndex(0)
            ->setCellValue('A1', 'INV.NO')
            ->setCellValue('B1', 'Vendor')
            ->setCellValue('C1', 'Description')
			->setCellValue('D1', 'Quantity');

// Write data from MySQL result
include("config.php");
$strSQL = "SELECT * FROM datamain";
$objQuery = mysql_query($strSQL);
$i = 2;
while($objResult = mysql_fetch_array($objQuery))
{
	$objPHPExcel->getActiveSheet()->setCellValue('A' . $i, $objResult["invoice_no"]);
	$objPHPExcel->getActiveSheet()->setCellValue('B' . $i, $objResult["supname"]);
	$objPHPExcel->getActiveSheet()->setCellValue('C' . $i, $objResult["desciption"]);
	$objPHPExcel->getActiveSheet()->setCellValue('D' . $i, $objResult["quantity"]);

	$i++;
}
mysql_close();

// Rename sheet
//echo date('H:i:s') . " Rename sheet\n";
$objPHPExcel->getActiveSheet()->setTitle('My Customer');


// Set active sheet index to the first sheet, so Excel opens this as the first sheet
$objPHPExcel->setActiveSheetIndex(0);


// Save Excel 2007 file
//echo date('H:i:s') . " Write to Excel2007 format\n";
//$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel2007');
//$strFileName = "myData.xlsx";
//$objWriter->save($strFileName);

header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
header('Content-Disposition: attachment;filename="myData.xlsx"');
header('Cache-Control: max-age=0');  

$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel2007');
$objWriter->save('php://output');


// Echo memory peak usage
//echo date('H:i:s') . " Peak memory usage: " . (memory_get_peak_usage(true) / 1024 / 1024) . " MB\r\n";

// Echo done
//echo date('H:i:s') . " Done writing file.\r\n";
?>