session working on localhost and not working on the web - php

Question

I've a script that assigns varibale to a specific session. It works perfectly on localhost but after uploading online, it just wouldn't work on the web. i.e
Here is the link that sends the variable through $_GET to the script
Register for this course
Here's the script meant to assign variable to the session
if (isset($_REQUEST['pubc_req'])) {
$c_id = $_GET['c_id'];
session_name("pubc_cart");
session_start();
$pubc_cart = $_SESSION[pubc_cart];
if ($pubc_cart) {
//$get_pub_arr[] = array();
$pubc_cart = $_SESSION[pubc_cart];
$get_pubc_arr[] = array();
$get_pubc_arr = $_SESSION[pubc_cart];
if(in_array($c_id, $get_pubc_arr)){
//$_SESSION['inh_cart'] = array();
?>
<script language="javascript">
window.location = "user_allc_booking.php?ex_pub_cid=<?php echo $c_id; ?>";
</script>
<?php
}
else {
//$_SESSION['pubc_cart'] = array();
$_SESSION[pubc_cart][] = $c_id;
//$pubc_cart[] = array();
//$pubc_cart = $_SESSION['pubc_cart'];
}
} else {
$_SESSION[pubc_cart][] = $c_id;
//$pubc_cart[] = array();
//$pubc_cart = $_SESSION['pubc_cart'];
}
//$_SESSION['pubc_cart'] = $pubc_cart;
?>
<script language="javascript">
window.location = "user_allc_booking.php";
</script>
<?php
$pub_query_course_info = #mysql_query("select * from public_courses where id='".$c_id."'");
$pub_course_det = array();
$pub_course_det = #mysql_fetch_assoc($pub_query_course_info);
$pub_course_title = $pub_course_det['title'];
}
In addition:
There's another session that works perfectly both locally and on the web for the same application.
This session is $_SESSION['member_id']
The member_id session handles the login id for all users while registering for courses. It's working fine except for the pubc_cart which holds the course id.
Im really puzzled. Is there another way to assign variable to session different from this or do you have to write a different script locally and then a different one for the web...
Pls I'm really confused here.. Would be glad to get help.

Answer 1

It can be due to the reason that your session expires too fast on another server. Start by making sure you're setting the session variable correctly. It's possible that sessions either aren't enabled or aren't configured correctly in the php.ini file on your server.
You can try putting this in front of the file to see any errors. When you see the error you can figure out where you have gone wrong.
error_reporting(E_ALL);
ini_set('display_errors', 1);