$_SESSION not available when using jqUploader

I am using PHP and jQuery for an uploader. I am having a huge problem though and would like some input as to how best handle these two together.

I am using a PHP session variable that I am using to change the filename after the jquery uploader has finished. The jquery "url" is pointing to a PHP function that handles the actual upload. When I use the jquery uploader to upload an image, the session variable is never available. I'm assuming because the uploader itself is not using a session.

How can I resolve this issue? I need to have that session variable to change the filename.

EDIT: I am using jqUploader

Here is the code

function jqUploadPhoto( ){
    $picSize = '50550500';
    $picDir  = '/photos';

    $temp = $_FILES['uploadfile']['name'];
    ... substr开发者_C百科()... convert old name to new name

    $file = $_SESSION['name'].$ext; // This is set and can be echoed when this func is used from a browser. Not available in JQ

    if (move_uploaded_file($_FILES['uploadfile']['tmp_name'], $file) == false){ // This dies because the filename isn't available.
      echo 'NOTOK';
    }

}

I had this issue with Uploadify.

The problem

Your browser makes a request to your site, the session is started and a cookie containing your session ID is set.

You then make an upload using Flash, note that Flash is not your browser and it acts as a new request. So a new session id is created and a new cookie is created, giving you two different sessions.

The solution

I got around this by setting the session id in the page, eg. in a hidden input and appening this session id to the request when Flash makes the upload. You need to detect this session id when you upload and set it using session_id() - http://php.net/manual/en/function.session-id.php . This will then replicate the session that the browser created.

Hope that helps.