Detailed code explanation of routing in Laravel

Laravel is a popular PHP framework. After years of development, it has become one of the preferred frameworks for PHP developers. It has very powerful routing functions. This article will introduce how to write routes in Laravel.

In Laravel, all routes are defined in the routes/web.php file. The routes defined in this file are the main routes for the web application.

Laravel's routing is divided into two methods: GET and POST routing. The GET route is used to obtain data, and the POST route is used to send data to the server. The following describes how to define GET and POST routes in Laravel.

How to define GET route

In the routes/web.php file, use the following code to define the GET route:

Route::get('/', function () {
    return view('welcome');
});

The above code defines A route that returns the welcome view when the user accesses the project root path. In this example, / represents the project root path, and function () {} is an anonymous function that will be executed when the route is accessed.

You can also specify methods in the Controller:

Route::get('/users', 'UserController@index');

The above code defines a users route. When the user accesses the route, Laravel will call UserControllerThe index method in the controller. Methods in the Controller can perform more complex operations, such as retrieving data from the database and displaying it in the view.

How to define POST routing

In the routes/web.php file, use the following code to define the POST route:

Route::post('/users', function (Request $request) {
    $name = $request->input('name');
    $email = $request->input('email');
    // 保存到数据库中
    return view('users');
});

The above code defines A users route. When a user sends a POST request to this route, Laravel will execute the defined anonymous function. This function uses an instance of the Request class to receive the data from the POST request and then saves the data to the database.

In addition to GET and POST, there are other HTTP request methods, such as PUT, DELETE, etc. Laravel supports all HTTP request methods. The following is an example of using a PUT request:

Route::put('/users/{id}', function ($id) {
    // 根据ID更新用户
});

The above code defines a users route. When the user accesses this route using the PUT request method, Laravel will execute the defined anonymous function. This function receives a $id parameter, which is used to indicate that the user's ID is to be updated.

In Laravel, routing also supports parameters and route grouping. Here is an example of using parameters and route grouping:

Route::group(['middleware' => 'auth'], function () {
    Route::get('/dashboard', 'DashboardController@show');
    Route::get('/users/{id}', 'UserController@show');
});

The above code defines a dashboard route and a users route, both routes are in Under the protection of auth middleware. The DashboardController@show method will display the dashboard view, and the UserController@show method will display the user information based on the passed in $id parameter.

Conclusion

Laravel's routing function is very powerful. It can easily define all types of routes and provides many convenient functions, such as routing parameters, route grouping, middleware, etc. When you start using Laravel, be sure to understand these routing knowledge to better use this powerful PHP framework.

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