三元忽略第一个条件

Question

为什么我的三元组忽略了第一个条件 ($order->status === "prepairing")？

它总是在检查订单状态时跳过第一个条件并立即转到第二个（并且总是认为它是真的）

$messageMiddle = (  ($order->status === "prepairing") ? " your prder is being prepared. Make your way towards the store." 
                  : ($order->status === "complete")   ?' your order is done! Please show your order-code at the store.' 
                  : ' thank you for ordering ');

Answer 1

您需要对括号中的每个下一个表达式进行分组，如下所示。您忘记将第二个三元表达式括在括号中。

$messageMiddle = ($order->status === "prepairing") ? " your order is being prepared. Make your way towards the store." : 
                 (($order->status === "complete")  ? ' your order is done! Please show your order-code at the store.'  : ' thank you for ordering ');

但是无论如何你应该避免这种方法。

Answer 2

对订单状态做出反应的更好方法是switch statement。像这样：

switch ($order->status) {
    case "preparing" : $messageMiddle = " your order is being prepared. Make your way towards the store.";
                       break;
    case "complete"  : $messageMiddle = " your order is done! Please show your order-code at the store.";
                       break;
    default          : $messageMiddle = " thank you for ordering ";
                       break;
}

很容易看出如何扩展它以对其他状态词做出反应。

请注意，我将 `"prepairing" 更改为 "preparing"。

程序员追求的一件事就是简洁的代码。然而，更短的代码并不总是更好的代码。它可能不太可读并且更难维护和扩展。

三元忽略第一个条件

Ternary ignores first condition

php

ternary-operator