在 Laravel 中存储和检索常量
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Storing and retrieving constants in laravel
提问by SwiftD
I have just started playing with laravel haveing come from codeigniter and I am trying to work out the best way to define a series of constants. CI uses a constants folder under app/config and I was largely happy with this approach for most things but wanted advice as to the best way to do this in Laravel.
我刚刚开始使用来自 codeigniter 的 laravel，我正在尝试找出定义一系列常量的最佳方法。CI 在 app/config 下使用了一个常量文件夹，我对大多数情况下的这种方法非常满意，但希望就在 Laravel 中执行此操作的最佳方法提供建议。
My constants fall into 3 categories and I would like advice if possible on how best to store and retrieve each (baring in mind I'm completely new to Laravel.
我的常量分为 3 类，如果可能的话，我想就如何最好地存储和检索每个类提供建议（请记住，我对 Laravel 完全陌生。
Type 1:
Constants which need to be loaded everytime a controller is called:
e.g. I would like to start by defining a constant to tell me if the user is requesting content via ajax, this is what I used to do in CI constants file:
define('IS_AJAX', isset($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest')
类型 1：每次调用控制器时都需要加载的常量：例如，我想首先定义一个常量来告诉我用户是否通过 ajax 请求内容，这就是我过去在 CI 常量文件中所做的：
define('IS_AJAX', isset($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest')
Type 2: Constants which can be changed by the user: Are these best stored in a database or would writing to a config file be a better option? Again looking for advice on how to store and retrieve
类型 2：用户可以更改的常量：这些常量是存储在数据库中还是写入配置文件是更好的选择？再次寻求有关如何存储和检索的建议
Type 3: Constants which are only needed in specific controllers: Ideally I would like to be able to group constants into arrays or separate files and pull them out in groups as required. e.g. I could just retrieve my upload settings for my upload controller.
类型 3：仅在特定控制器中需要的常量：理想情况下，我希望能够将常量分组到数组或单独的文件中，并根据需要将它们按组拉出。例如，我可以检索上传控制器的上传设置。
Thanks for any help/advice in advance - examples would be greatly appreciated
感谢您提前提供任何帮助/建议-示例将不胜感激
回答by crynobone
Type 1You can add any constant in Bundle (or application) start.php file.
类型 1您可以在 Bundle（或应用程序）start.php 文件中添加任何常量。
Type 2 and 3I would suggest using Config for both these requirement.
类型 2 和 3我建议使用 Config 来满足这两个要求。
回答by Sebastian Gomez
My solution is create a file inside app/config folder called "constants.php" app/config/constants.php
我的解决方案是在 app/config 文件夹中创建一个名为“constants.php”的文件 app/config/constants.php
The code inside is in array way.
里面的代码是数组方式。
"某个值", 'c2'=>"某个值" ); ?>then inside each controller you can retrieve using Config::get('constants.c1');
然后在每个控制器中，您可以使用 Config::get('constants.c1'); 检索；
I think is an easy way to do it, it's more scalable.
我认为这是一种简单的方法，它更具可扩展性。
回答by Khang
<?php
//file : app/config/constants.php
return [
'IS_AJAX' => isset($_SERVER['HTTP_X_REQUESTED_WITH']
];
in anywhere:
在任何地方：
echo Config::get('constants.IS_AJAX');
