How does the Router in the php MVC framework work (with code)

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MVC Router or Dispatcher will detect the URL of the HTTP request and try to match a single URL component with the controller and the method defined in the controller, while passing all parameters into the method .

A simple router class is given below to roughly illustrate how the router works. However, in a real project, the router is much more complex than the example router below because it has to deal with more things. The

routes[$route] = $closure; } // 执行特定的路由 function execute() { $path = $_SERVER['PATH_INFO']; /** * 检测给定路由是否被定义， * 或者执行默认的 '/' 首页路由。 */ if (array_key_exists($path, $this->route)) { $this->route[$path](); } else { $this->route['/](); } } }

SimpleRouterclass is a simplified model of an MVC router. Its main function is to add each user-defined route to an array and execute it. To understand how it works, copy the code below into theindex.phpfile.

routes[$route] = $closure; } // 执行特定的路由 function execute() { $path = $_SERVER['PATH_INFO']; /** * 检测给定路由是否被定义， * 或者执行默认的 '/' 首页路由。 */ if (array_key_exists($path, $this->route)) { $this->route[$path](); } else { $this->route['/](); } } } /* 创建 Router 实例 */ $router = new SimpleRouter(); /* 添加首页闭包值路由器 */ $router->add_route('/', function(){ echo 'Hello World'; }); /* 添加另一个闭包路由 */ $router->add_route('/greetings', function(){ echo 'Greetings, my fellow men.'; }); /* 添加可回调函数作为路由 */ $router->add_route('/callback', 'myFunction'); /* 回调函数处理程序 */ function myFunction(){ echo "This is a callback function named '" . __FUNCTION__ ."'"; } /* 执行路由 */ $router->execute();

Now go to your browser and visit the following urls:

http://localhost/index.php/ http://localhost/index.php/greetings http://localhost/index.php/callback

For each url, you should see a different message defined in our route. So how does the router work?

In our example, theadd_routemethod adds the path name (route) of the url to the routing array and defines the corresponding processing operation. This processing operation can be a simple function or callback function, passed in as a closure. Now when we execute the router'sexecutemethod, it will detect whether a route is matched in the current$routesarray, and if so, execute this function or callback function.

If you usevar_dumpthis$routesarray, you can see the specific contents of the array. For each defined route a closure is stored associated with it.

array (size=3) '/' => object(Closure)[2] '/greetings' => object(Closure)[3] '/callback' => string 'myFunction' (length=10)

Execution processing is completed by the following lines.$this->routes[$path]** statement returns a closure, which is stored in the **\$routesarray and is used to specify the execution of the route. Note the().

$this->routes[$path](); // 或 $this->routes['/']();

The above example simply demonstrates how the router works. For the sake of simplicity, we do not handle any errors and do not consider routing security issues.

Related recommendations:

PHP MVC framework routing study notes, mvc framework routing study notes

##PHP learning MVC framework routing

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