download not working

["Ross" <ross@xxxxxxxxxxxxx>]

working form this example

http://www.php-mysql-tutorial.com/php-mysql-upload.php


my code is as follows, all I get is a corrupt pdf file.....

$query= "SELECT * FROM publications WHERE alphabet='a'";

 $result= mysql_query($query);
   while  ($row = @mysql_fetch_array($result, MYSQL_ASSOC)){

    $row['pdf_size'] = $row['pdf_size']/ 1024;
 $row['pdf_size']= number_format($row['pdf_size'], 0);
 $size= $row['pdf_size'];
$name = str_replace("_", " ", $row['pdf_name']);
$name = str_replace(".pdf", "", $name);
$link= $row['content'];

echo "<span class=\"pdflinks\">$name</span>";
echo "&nbsp;&nbsp;";
echo "<span class=\"sizes\">($size kb)</span>";
//<a href="#">ross</a>
?>
download is here......
<a href="a-z.php?id=<?=$row['id'];?>">link</a> <br>
<?

if(isset($_GET['id']))
{
 echo "id is this";
$id    = $_GET['id'];
$query = "SELECT * FROM publications WHERE id = '$id'";

$result = mysql_query($query) or die('Error, query failed');

$pdf_size=$row['pdf_size'];
$pdf_type=$row['pdf_type'];
$pdf_name=$row['pdf_name'];
ob_clean();
header("Content-length: $pdf_size");
header("Content-type: $pdf_type");
header("Content-Disposition: attachment; filename=$pdf_name");
echo $content;


exit;
}
}

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