如何使用三元运算符编写这些“if..else”条件语句答案

【问题标题】：How to write these `if..else` conditional statements with Ternary Operators如何使用三元运算符编写这些“if..else”条件语句
【发布时间】：2021-09-10 02:20:54
【问题描述】：

我想用三元运算符编写这些if..else 语句：

if((($request->city)=="98")&&($cartPrice >= 300000)&&($request->province)=="8")){
    "ort_free_delivery" => 'City sending free delivery'
}elseif((($request->city)!="98")&&($cartPrice >=300000)&&($request->province)!="8")){
    "ort_free_delivery" => 'Country sending free delivery'
}else{
    "ort_free_delivery" => '',
}

这是我的尝试：

( ( ($request->city)=="98" ) ? ($cartPrice>=300000) ? ( ( ($request->province)=="8" ) ? "ort_free_delivery" == "City sending free delivery" ) ); 

( ( ($request->city)!="98" ) ? ($cartPrice>=300000) ? ( ( ($request->province)!="8" ) ? "ort_free_delivery" == "Country sending free delivery" : "ort_free_delivery" == "" ) );

但这是错误的，因为有两行三元运算符，我需要在一行中使用这个条件（因为我在 Laravel 中插入了一些带有 DB 类的数据）：

    DB::table('order_detail')->insert([
        "ort_ord_id" => $orderId,
        "ort_amount" => $value->price,
        "ort_total" => $value->discounted * $value->quantity,
        "ort_discount" => ($value->price * $value->quantity) - $value->discounted * $value->quantity,
        "ort_type" => "product",
        "ort_number" => $value->quantity,
        "ort_reference_id" => $value->id,
        ( ( ($request->city)=="98" ) ? ($cartPrice>=300000) ? ( ( ($request->province)=="8" ) ? "ort_free_delivery" == "City sending free delivery" ) )
        ( ( ($request->city)!="98" ) ? ($cartPrice>=300000) ? ( ( ($request->province)!="8" ) ? "ort_free_delivery" == "Country sending free delivery" : "ort_free_delivery" == "" ) )
        "created_at" => now(),
        "updated_at" => now()
    ]);

所以我的问题是，如何在一行中添加这个带有三元运算符的条件语句？

【问题讨论】：

标签： php laravel if-statement laravel-8 conditional-operator

【解决方案1】：

一个选项是构建数组然后插入

$data=[
        "ort_ord_id" => $orderId,
        "ort_amount" => $value->price,
        "ort_total" => $value->discounted * $value->quantity,
        "ort_discount" => ($value->price * $value->quantity) - $value->discounted * $value->quantity,
        "ort_type" => "product",
        "ort_number" => $value->quantity,
        "ort_reference_id" => $value->id,
        "created_at" => now(),
        "updated_at" => now()
    ];

对于条件数据

if($request->city==98&&$cartPrice >= 300000&&$request->province==8){
    $data["ort_free_delivery"] = 'City sending free delivery';
}elseif($request->city!=98&&$cartPrice >=300000&&$request->province!=8){
     $data["ort_free_delivery"] = 'Country sending free delivery';
}else{
    $data["ort_free_delivery"] = '';
}

然后查询

  DB::table('order_detail')->insert($data);

或

DB::table('order_detail')->insert([
    "ort_ord_id" => $orderId,
    "ort_amount" => $value->price,
    "ort_total" => $value->discounted * $value->quantity,
    "ort_discount" => ($value->price * $value->quantity) - $value->discounted * $value->quantity,
    "ort_type" => "product",
    "ort_number" => $value->quantity,
    "ort_reference_id" => $value->id,
    "ort_free_delivery" =>($request->city==98&&$cartPrice >= 300000&&$request->province==8)?'City sending free delivery':
        (($request->city!=98&&$cartPrice >=300000&&$request->province!=8)?'Country sending free delivery':null),
    "created_at" => now(),
    "updated_at" => now()
]);

【讨论】：

【解决方案2】：

你可以试试这个。这个想法是用第二个三元组替换第一个 : 之后的语句。只有当第一个条件为假时，才会评估第二个三元组。

    DB::table('order_detail')->insert([
        "ort_ord_id" => $orderId,
        "ort_amount" => $value->price,
        "ort_total" => $value->discounted * $value->quantity,
        "ort_discount" => ($value->price * $value->quantity) - $value->discounted * $value->quantity,
        "ort_type" => "product",
        "ort_number" => $value->quantity,
        "ort_reference_id" => $value->id,
        "ort_free_delivery" => ( ( ($request->city)=="98" ) &&  ($cartPrice>=300000) && ( ($request->province)=="8" ) ) ? "City sending free delivery" : ( ( ($request->city)!="98" ) && ($cartPrice>=300000) && ( ($request->province)!="8" ) ) ? "Country sending free delivery" : "" ) ),
        "created_at" => now(),
        "updated_at" => now()
    ]);

【讨论】：

【解决方案3】：

使用var_dump 进行测试，而不是你拥有的，这是我想出的：

(((($request->city=="98")&&($cartPrice>=300000)&&($request->province=="8"))?var_dump('1'):((($request->city!="98")&&($cartPrice>=300000)&&($request->province=="8"))?var_dump('2'):var_dump('3'))))

以更易读的方式：

(
    (
        (
            ($request->city == "98") && 
            ($cartPrice >= 300000) && 
            ($request->province == "8")
        )
        ? var_dump('1') 
        : (
            (
                ($request->city != "98") && 
                ($cartPrice >= 300000) && 
                ($request->province == "8") 
            )
            ? var_dump('2')
            : var_dump('3')
          )
    )
)

【讨论】：

【解决方案4】：

"ort_free_delivery" => ($cartPrice >= 300000 ? ( $request->city=="98" && $request->province=="8" ? 'City sending free delivery' : 'Country sending free delivery' ) : '')

人工阅读代码：

如果 cartPrice 低于 300000 总是 ''

否则，如果两个城市是 98 并且省份同时是 8 (AND)...

是“城市发送..”

其他

是“国家发送..”

因为：

主要区分规则似乎是 city=98 和 Province=8 都必须为 True 才能成为“发送城市”...

...所以所有其他情况都是“国家发送”...

...当购物车价格 >= 300000

【讨论】：