问PHPExcel无法从数据库生成数据

EN

<?php
require_once 'database.php';

include 'PHPExcel.php';

$phpExcel = new PHPExcel();

$phpExcel->getActiveSheet()->setTitle("My Sheet");

$phpExcel->setActiveSheetIndex(0)
     ->setCellValue('A1', 'Name.')
     ->setCellValue('B1', 'Age');

$qry_table = ("SELECT * FROM MEMBERS");

$inc=2;

while($data_array = mysql_fetch_array($qry_table))
{

$name   = $data_array['Name'];

$age    = $data_array['Age'];

$$phpExcel->setActiveSheetIndex(0)
            ->setCellValue('A'.$inc, $name)
            ->setCellValue('B'.$inc, $age);
$inc++;
}

$phpExcel->setActiveSheetIndex(0);

header("Content-Type: application/vnd.ms-excel");

header("Content-Disposition: attachment; filename=\"filename.xls\"");

header("Cache-Control: max-age=0");

$objWriter = PHPExcel_IOFactory::createWriter($phpExcel, "Excel5");

$objWriter->save("php://output");
exit;