//Get Session parameters
    $myJSONRPCClient = new JsonRPCClient( LS_BASEURL );
    $sessionKey= $myJSONRPCClient->get_session_key( LS_USER, LS_PASSWORD );

    $aParticipantData = array(
        'user'=>array('firstname'=>'Christopher',
                'lastname'=>'hitchens',
                'email'=>'christopher@example.com',
                'language'=>'en',
                'emailstatus'=>'ok'),
        );

    $added_user = $myJSONRPCClient->add_participants($sessionKey, $survey_id, $aParticipantData, 1);
    $myJSONRPCClient->release_session_key($sessionKey );