function uploadFile()
{


    $userDetail = getUserDetails();
    $valid_file = false;

    $code = 0;
    //if they DID upload a file...
    if ($_FILES['myFile']['name']) {
        //if no errors...
        if (!$_FILES['myFile']['error']) {
            //now is the time to modify the future file name and validate the file
            $new_file_name = strtolower($_FILES['myFile']['tmp_name']); //rename file
            if ($_FILES['myFile']['size'] > (1024000)) //can't be larger than 1 MB
            {
                $valid_file = false;
                $message = 'Oops!  Your file\'s size is to large.';
            }

            //if the file has passed the test
            if ($valid_file) {
                //move it to where we want it to be
                move_uploaded_file($_FILES['myFile']['tmp_name'], 'files/' . $userDetail['user_id'] . "/" . $new_file_name);
                $message = 'Congratulations!  Your file was accepted.';
                $code = 1;
            }
        } //if there is an error...
        else {
            //set that to be the returned message
            $message = 'Ooops!  Your upload triggered the following error:  ' . $_FILES['myFile']['error'];
            respondJSON($code, $message);
        }

    }

    function getFileList()
    {


        setUserDetails(3, "michael");///testing
        $userDetail = getUserDetails();


        $dir_list = scandir('files/' . $userDetail['user_id'] . "/");


        respondJSON(1, $dir_list);

    }

    function getUserDetails()
    {
        $details = array();

        $details['user_id'] = isset($_SESSION['user_id']) ? $_SESSION['user_id'] : null;

        $details['username'] = isset($_SESSION['username']) ? $_SESSION['username'] : null;

        return $details;
    }

    function setUserDetails($user_id, $username)
    {
        $_SESSION['user_id'] = $user_id;
        $_SESSION['username'] = $username;
    }


    function respondJSON($code = 1, $data = array())
    {
        $r = array();

        $r['code'] = $code;
        $r['data'] = $data;


        header("Content-type: application/json");
        print json_encode($r);

        exit;


    }
}