MVC 路由是如何工作的?

Note: Object-oriented programming purists, following the Single Responsibility Principle, might argue that routing components of a URL and dispatching a Controller class are two separate responsibilities. In that case, a Dispatcherclass would actually instantiate the Controller and pass one of its methods any arguments derived from the client HTTP request.

示例 1:Controller，但没有操作或参数.

Example 1: Controller, but no action or arguments.

http://localhost/contact 在 GET 请求中，这可能会显示一个表单.

http://localhost/contact On a GET request, this might display a form.

控制器 = 合约

Action = 默认(通常是 index() 方法)

Action = Default (commonly an index() method)

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示例 2:Controller 和动作，但没有参数.

Example 2: Controller and action, but no arguments.

http://localhost/contact/send 在 POST 请求中，这可能会启动服务器端验证并尝试发送消息.

http://localhost/contact/send On a POST request, this might kick of server-side validation and attempt to send a message.

控制器 = 合约

操作 = 发送

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示例 3:Controller、动作和参数.

Example 3: Controller, action, and arguments.

http://localhost/contact/send/sync 在 POST 请求中，这可能会启动服务器端验证并尝试发送消息.但是，在这种情况下，JavaScript 可能未处于活动状态.因此，为了支持优雅降级，您可以告诉 ContactController 使用支持屏幕重绘的 View 并使用 Content-Type: text/的 HTTP 标头响应html，而不是 Content-Type: application/json.sync 将作为参数传递给 ContactConroller::send().请注意，我的 sync 示例完全是随意编造的，但我认为它符合要求！

http://localhost/contact/send/sync On a POST request, this might kick of server-side validation and attempt to send a message. However, in this case, maybe JavaScript is not active. Thus, to support graceful degradation, you can tell the ContactController to use a View that supports screen redraw and responds with an HTTP header of Content-Type: text/html, instead of Content-Type: application/json. sync would be passed as an argument to ContactConroller::send(). Note, my sync example was totally arbitrary and made up, but I thought it fit the bill!

控制器 = 合约

操作 = 发送

Arguments = [sync]//是的，在数组中传递参数！

Arguments = [sync] // Yes, pass arguments in an array!

Router 类实例化请求的具体子Controller，从控制器实例调用请求的方法，并将其参数(如果有)传递给控制器​​方法.

A Router class instantiates the requested, concrete child Controller, calls the requested method from the controller instance, and passes the controller method its arguments (if any).

1) 您的 Router 类应该首先检查是否有一个具体的 Controller 可以实例化(使用找到的名称在 URL 中，加上控制器"一词).如果找到控制器，测试请求的方法是否存在(行动).

1) Your Router class should first check to see if there is a concrete Controller that it can instantiate (using the name as found in the URL, plus the word "Controller"). If the controller is found, test for the presence of the requested method (action).

2) 如果 Router 在运行时找不到并加载必要的 PHP(使用 autoloader 被建议)实例化一个具体的 Controller 子项，然后它应该检查一个数组(通常在另一个类名 Route) 以查看请求的 URL 使用正则表达式匹配 中包含的任何元素.Route 类的基本框架如下.

2) If the Router cannot find and load the necessary PHP at runtime (using an autoloader is advised) to instantiate a concrete Controller child, it should then check an array (typically found in another class name Route) to see if the requested URL matches, using regular expressions, any of the elements contained within. A basic skeleton of a Route class follows.

注意:.*? = 零个或多个任意字符，非捕获.

Note: .*? = Zero, or more, of any character, non-capturing.

class Route
{
    private $routes = [
        ['url' => 'nieuws/economie/.*?', // regular expression.
         'controller' => 'news',
         'action' => 'economie'],
        ['url' => 'weerbericht/locatie/.*?', // regular expression.
         'controller' => 'weather',
         'action' => 'location']
    ];

    public function __contstruct()
    {

    }

    public function getRoutes()
    {
        return $this->routes;
    }
}

为什么要使用正则表达式?一个不太可能在 URL 中的第二个正斜杠之后完成数据的可靠匹配.

Why use a regular expression? One is not likely to get reliable matching accomplished for data after the second forward slash in the URL.

/controller/method/param1/param2/...，其中 param[x] 可以是任何东西！

/controller/method/param1/param2/..., where param[x] could be anything!

警告:当目标数据包含模式分隔符(在本例中为正斜杠/")时，最好更改默认的正则表达式模式分隔符 ('/').几乎所有非有效的 URL 字符将是一个不错的选择.

Warning: It is good practice change the default regular expression pattern delimiter ('/') when targeting data contains the pattern delimiter (in this case, forward slashes '/'. Almost any non-valid URL character would be a great choice.

Router 类的一个方法将遍历 Route::routes 数组以查看目标 URL 和 之间是否存在正则表达式匹配string value 与第二级 url 索引相关联.如果找到匹配项，Router 然后知道要实例化哪个具体的 Controller 以及要调用的后续方法.参数将根据需要传递给方法.

A method of the Router class will iterate over the Route::routes array to see if there is a regular expression match between the target URL and the string value associated with a 2nd level url index. If a match is found, the Router then knows which concrete Controller to instantiate and the subsequent method to call. Arguments will be passed to the method as necessary.

始终警惕边缘情况，例如表示以下内容的 URL.

Always be wary of edge cases, such as URLs representing the following.

`/`   // Should take you to the home page / HomeController by default
`''`  // Should take you to the home page / HomeController by default
`/gibberish&^&*^&*%#&(*$%&*#`   // Reject

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