语法错误，意外的';'落后日期（'Y / m / d'）

Question

我收到错误消息/警告我语法错误：意外的';'我无法发现出了什么问题

错误行：

$sql .= "'" . db_escape($db, date('Y/m/d') . "'";

我将语法与上面的几行进行比较（$ sql。=“'”。db_escape（$ db，$ qty）。“'”;），其中语法相似但没有错误消息。因为这是我第一次使用date函数，所以我不确定我的date语法是否错误或是否真的缺少“;”下一行是哪个代码？

if(!isset($SESSION['orderid'])){

        $sql = "INSERT INTO orderline ";
        $sql .= "(ProductID, OrderQuantity) ";
        $sql .= "VALUES (";
        $sql .= "'" . db_escape($db, $productID) . "',";
        $sql .= "'" . db_escape($db, $qty) . "'";
        $sql .= ")";
        $result = mysqli_query($db, $sql) or die ("Couldn't execute query.");

            if($result){
                $_SESSION['message'] = $qty.'item(s) have been added to the cart.';
                //maybe redirect page? redirect_to
                $_SESSION['orderid'] = mysqli_insert_id($db); //to set the orderID in db to auto increment
            }else{
                echo mysqli_error($db);
                db_disconnect($db);
                exit;
            }

        $sql = "INSERT INTO orders ";
        $sql .= "(OrderID, CustomerID, OrderDate) ";
        $sql .= "VALUES (";
        $sql .= "'" . db_escape($db, $_SESSION['orderid']) . "',";
        $sql .= "'" . db_escape($db, $_SESSION['custid']) . "',";
        $sql .= "'" . db_escape($db, date('Y/m/d') . "'";//date format consistent with database Y/m/d
        $sql .= ")";
        $result = mysqli_query($db, $sql) or die ("Couldn't execute query.");

            if($result){
                $_SESSION['orders'] = 'True';           
            }else{
                echo mysqli_error($db);
                db_disconnect($db);
                exit;
            }

    }

没有错误消息或警告