php downlaod script

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My download script only gives me empty (0kb) xls files. They are being 
uploaded as blobs and seem ok. Can someone shed some light on why the 
downoad is not working.

Many Thanks,


R.


<?php
if(isset($_GET['id']))
{
// if id is set then get the file with the id from database

$id    = $_GET['id'];
$query = "SELECT id, file_name, size, type, content FROM results WHERE id = 
'$id'";

$result = mysql_query($query) or die(mysql_error());
list($id, $file_name, $type, $size, $content) = mysql_fetch_array($result);

header("Content-Type: application/vnd.ms-excel");
header("Content-Disposition: attachment; filename=$file_name");
header("Content-Length: ".filesize($size));
header("Accept-Ranges: bytes");
header("Pragma: no-cache");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Content-transfer-encoding: binary");


exit;
}

?> 

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