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php - Accessing session data outside Joomla

I am trying to run an application outside Joomla (not as a plugin) and I would like to access the logged in user's information (userid). I am wondering how should I go about doing that? Is there a file which I can include? I tried using $_SESSION but it shows empty.

Is there a simple solution to my problem? Thank you for your time.

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Actually that's not as easy as it sounds. Joomla uses its own session handling with come unique session-id-generation and some encryption in place, so the only way to get into the Joomla session data is to use the appropriate Joomla functions (as others have suggested). I recently had a project where we needed to transfer a Joomla authenticated user into a separate application. We did this by adding a Joomla adapter which instantiates the Joomla user classes, reads the user data, puts everything into an encrypted cookie and redirects back to our application. In there we read the encrypted cookie, instantiate our own user object and discard the cookie. As this is not 100% secure we're changing the system to write the user data in a database table and read it from our application - we avoid the unsecure way through a cookie that way, because even though the cookie is encrypted (and contains sensitive user information which suffice to authenticate a user) it'll be transfered on wire and could be sniffed.

define( '_JEXEC', 1 );
define('JPATH_BASE', dirname(dirname(__FILE__)));
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');

The above is the basic script required to access Joomla resources.


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