function addToCart($product_id, $session_id, $user_id = null) { $time = new TimeHelper(); $this->data['Cart']['product_id'] = $product_id; $this->data['Cart']['ct_date'] = $time->format("Y-m-d H:i:s", $time->gmt()); $this->data['Cart']['ct_qty'] = 1; $this->data['Cart']['ct_session_id'] = $session_id; $this->data['Cart']['user_id'] = $user_id; $this->save(); }