*/
function mod($data, $op = null) {
if (!($this->data instanceof Expr)) {
*/
function mod($data, $op = null) {
if (!($this->data instanceof Expr)) {
if (!isset($this->data)) {
$this->data = new Expr($this->name);
} elseif (is_numeric($this->data)) {
if (!isset($this->data)) {
$this->data = new Expr($this->name);
} elseif (is_numeric($this->data)) {