PHP Session Variables

Question

A user will click on a link which will open a new page (code below). My problem is that when this new page is opened, it creates a NEW session ID. How do I stop this from happening?

require_once('../../config.php');    //Database connection details
require_once('../../connect.php');   //Connect to database

session_start();  <----------- HERE


if(isset($_GET['id'])) 
{

$id = $_GET['id'];
$tbl_uploads = $_SESSION['COMPANY_ID'].'_uploads';

$query = "SELECT username, type, size, content FROM $tbl_uploads WHERE id = '$id'";

$result = mysql_query($query) or die('Error, query failed');
list($username, $type, $size, $content) = mysql_fetch_array($result);

header("Content-length: $size");
header("Content-type: $type");
header("Content-Disposition: inline; filename=$username");
echo $content;

mysql_close($link);
exit;
}

Answer 1

make sure you have on the first line of the file error_reporting(E_ALL);

I think you are having some other bug here, the session_start() should not affect this.

Answer 2

Is $_GET['id'] actually set? Slap an else clause on that initial if and spit out an error of some sort if it's not. Perhaps something's turning your click into a POST.

Answer 3

Any of the required files actually send any output. If so, session_start() should go before them.

Answer 4

session_start() might be the problem. When you start a session it should make a session ID. That is the way it seems to me anyway. Could you include the code for session_start()?

Answer 5

Why don't you try this:

$sid = session_id();
if ($sid == ""){ 
       //Session should be created
       session_start();
}//else Session already exists