Q:

Custom Sessions with Joomla

I've trying to build Joomla into my existing website so I can use it for premium content.  
I've already got a custom-built authentication system that sets my own session variables.
For some reason, Joomla (which is located in a different directory) doesn't want to recognize these session variables, even when adding the session_start(); line at the top of all Joomla pages.
Any idea how I can get Joomla to recognize my custom session variables so I can limit the content located in Joomla to only premium users?
Thank you.

A:

Joomla uses their own session management so when you use php session it wont work guarantee. To get around this just try to juse joomla session management.
This may solve you problem. 

A:

I know this is an old question, but I decided to post a solution here in case someone is still looking for it.
Joomla does use its own framework and session management. You can still write your own php files and access Joomla session variables. You just need to load the joomla framework into your php script.
For J1.6 you need to include the following lines at the beginning of your php script. NOTE: these need to be included at the very top as joomla is going to call a session_start().
define( '_JEXEC', 1 );
define( 'JPATH_BASE', realpath(dirname(__FILE__).'/..' )); //you will need to update this path to represent your installation. This path works if you store all your custom php scripts in a subdirectory off the main joomla install directory.

define( 'DS', DIRECTORY_SEPARATOR );

require_once ( JPATH_BASE .DS.'includes'.DS.'defines.php' );
require_once ( JPATH_BASE .DS.'includes'.DS.'framework.php' );
$mainframe = JFactory::getApplication('site');
$mainframe->initialise();

Once you do that you can store session variables using:
$session->set('msgjson',$msgjson);

read session variables using:
$msgjson = $session->get('msgjson')

and unset session variables using:
$session->clear('msgjson');

This works for J1.6. You will probably need to change the lines that load the joomla framework for other versions. I would start with the index.php in the Joomla's root directory as it has to load the framework.
I hope this helps.

