session is not working in uploadify plugin of jquery

Flash doesn't forward cookies from the browser, so $_SESSION will not work correctly. (The code is most likely failing when you require_once the session file.)

To summarize the concept:

1. Pass the session_id as a POST variable with Uploadify using scriptData
2. Manually call session_id($_POST['session_id']) prior to calling session_start();

this will also work..

         'scriptData': {'ts' : <?= time() ?>}