Help with Sessions

[jeep98]

I'm new to sessions and am having some trouble getting them to work. Here is my current code that I've scrapped together by reading a few tutorials:

<?php

$mkid = $_GET['MKID'];
if(isset($mkid)){
session_start();
$_SESSION['MKID'] = $mkid;
}

session_start();
if(!isset($_SESSION['MKID']))
$_SESSION['MKID'] = 0;

?>

My goal here is to get the variable "MKID" from an incoming url and stick that variable into a session for future use (on any page of my site). If an incoming link doesn't have an MKID value, I just want to set it to zero. The current code throws a bunch of PHP errors at me ("Cannot send session cookie - headers already sent").

Thanks.

[Kroberts]

Usually cookies need to be sent before anything else.

[jeep98]

Figured it out. I think the main problem was empty spaces before my php tag. Thanks.

[coopster]

Yep, that will do it. Thanks, Kroberts, and welcome to WebmasterWorld.