Изменение в формате возврата токена FB

    public function getAccessToken( $code )
    {
        $url = self::ACCESS_TOKEN_URL . '?client_id=' . $this->_appId . '&redirect_uri=' . urlencode( $this->_callBackUrl ) . '&client_secret=' . $this->_appSecret . '&code=' . rawurlencode( $code );

        /* Send it and hope to receive access_token=blah */
        $result = $this->_send( $url, 'GET' );

        $params = null;

        parse_str($result, $params);


        if ( $params['access_token'] )
        {
            return $params['access_token'];
        }
        else
        {
            /* Likely to be an error in json */
            $params = json_decode( $result );
            return $params->access_token;
        }
    }