header setting

hi every body.
I want to download an excel file in php.it has 3 sheet with some row and col.
I use this code to do it:

header('Pragma: public');
header('Cache-Control: no-store, no-cache, must-revalidate'); header('Cache-Control: pre-check=0, post-check=0, max-age=0');
header ("Pragma: no-cache");
header("Expires: 0");
header('Content-Transfer-Encoding: none');
header("Content-type: application/x-msexcel");
header("Content-disposition: attachment; filename=MapFeaturesExcel.xls");
readfile("$Folder / $export_file");
exit(0);

but after I look MapFeaturesExcel.xls I see only one sheet,and all of data show in one cell.it is very different from the source file.where is my wrong?

What you want??
1) copy data form excel file to database
2) database to excel file

i give code,which can export sql data to exel file(csv format)...

$SQL="Select * from student";
$tot=mysql_query($SQL,$rs);
if($tot==0)
{
$msg="No records found with such roll number"."<br>"."Please enter valid starting & ending roll no.!";
export_show($msg);
print "$data[roll_no]\"";
die();
}
header("Content-type: text/html");
header("Content-Disposition: attachment; filename=student_data.csv");
print "NAME, AGE, SEX, COUNTRY, ABOUT, IMAGE_PATH, EMAIL, QUALIFICATION1, QUALIFICATION2, QUALIFICATION3, QUALIFICATION4, ROLL_NO, DATE_JOIN";
while($data = mfa($rs))
{
$row="$data[name]";
$row.=",\"$data[age]\"";
$row.=",\"$data[sex]\"";
$row.=",\"$data[country]\"";
$row.=",\"$st[about]\"";
$row.=",\"$data[image_path]\"";
$row.=",\"$data[email]\"";
$row.=",\"$data[qualification1]\"";
$row.=",\"$data[qualification2]\"";
$row.=",\"$data[qualification3]\"";
$row.=",\"$data[qualification4]\"";
$row.=",\"$data[roll_no]\"";
$row.=",\"$data[date_join]\"";
print $row."\n";
}

header("Content-type: text/html");
header("Content-Disposition: attachment; filename=filename.csv");