Problems downloading a PDF

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Hi,

I'm building this site that has several PDFs to download, but only to registered users.

To prevent people to insert the full URL to the documents, i moved them outside Apache's DocumentRooot, which is /var/www.

My site is in /var/www/telbit and i put the PDFs in /var/www

I've coded in order to do the trick, but it's failing.
I can't get the name of the file.
Notice that the page which has the code is products-teststudio.php itself.

The code follows my signature.

Any help would be appreciated.

Warm Regards
--
:wq! Mário Gamito
--

<?php
 if (isset($_SESSION['email'])) {
echo"<a href=\"products-teststudio.php?file=testudio.pdf\" rel=\"external\">Download TESTUDIO flyer</a>";

  $file = $_GET['file'];

  // try to sanitize the filename
  if (preg_match('/[^A-Za-z0-9._]/', $file))
   die("Invalid filename.");

  $path = '/var/www/';
  $full = $path . $file;

  header('Content-type: application/pdf');
  header("Content-Length: " . filesize($full));
header('Content-disposition: attachment; filename="'. basename($file) .'"');
  readfile($full);
 }

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