我已经使用prepared语句将订单插入到订单表中，但是现在我想根据订单表中插入的最后一个ID将订单项插入到订单表中：

if (isset($_POST['process'])) {

    $order_name = $_POST['order_name'];
    //create initial order
    $stmt = $conn2->prepare("INSERT INTO orders (order_name) VALUES (?)");
    $stmt->bind_param('s', $order_name);
    $stmt->execute();

    //this gets the most recent auto incremented ID from the database - this is the order_id we have just created
    $order_id = mysql_insert_id();

    //loop over all of our order items and add to the database
    foreach ($_SESSION['order'] as $item) {

等同于mysql_insert_id();使用准备好的语句？