phpexcel.net make excel using php part 2

<?php
if($_POST)
{
    $aData=$_POST['txt'];
    $sType='2007 XLSX';
    error_reporting(E_ALL);
    date_default_timezone_set('Europe/London');
    require_once 'Classes/PHPExcel.php';
    $objPHPExcel = new PHPExcel();
    $objPHPExcel->getProperties()->setCreator("Nasgor")
     ->setLastModifiedBy("Gunawan")
     ->setTitle("Office  Test Document")
     ->setSubject("Office $sType Test Document")
     ->setDescription("Test document for Office $sType, generated using PHP classes.")
     ->setKeywords("office $sType openxml php")
     ->setCategory("Test result file");

    foreach($aData as $posY=>$aData2)
    {
        for($i=1;$i<6;$i++){ //count($aData2)
            $pos=chr(64+$i).($posY+1);
            $aData2[$i]?$dt=addslashes($aData2[$i]):$dt='';
            $objPHPExcel->setActiveSheetIndex(0)
                ->setCellValue($pos,$dt );
        }
    }

    $objPHPExcel->getActiveSheet()->setTitle('Testing');

    $writeAs='Excel2007';
    $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, $writeAs);

    $objWriter->save('tmp/003data.xlsx');

    header('location:?stat=open');
    die();
}
if($_GET['stat']=='open')
{
    header('Content-type:application/vnd.openxmlformats-officedocument.spreadsheetml.sheet') ;
    $fName='tmp/003data.xlsx';
    header('Content-Disposition: attachment; filename="003.xlsx"');
    $f=file_get_contents($fName);
    echo $f;

    die();
}
?><form method="post"  enctype='multipart/form-data'>
<table border=1>
<tr><th>&nbsp;</th><th>A</TH><TH>B</TH><TH>C</TH><TH>D</TH><TH>E</TH></TR>
<?php
for($i=0;$i<5;$i++)
{
    $s.='<tr><td>'.++$n."</td>";
    for($j=1;$j<6;$j++)
    {
        $s.="<td><input type=text
        name='txt[$i][$j]' size=6 />";
    }
    $s.="<tr>\\n";
}
echo $s;
?>

</table>
<br><input name=stat type=submit value='input' />
</form>