What are the commonly used middleware in laravel?

Commonly used middleware in laravel are: 1. "$middleware" global middleware. When all requests need to be processed, it is suitable to be defined in this component; 2. "$routeMiddleware" routing Middleware; 3. "$middlewareGroups" middleware group.

The operating environment of this tutorial: Windows 7 system, Laravel 6 version, Dell G3 computer.

Three middleware commonly used in laravel

$middleware attribute:

This attribute is called It is global middleware. Why is it called global middleware? Because every time you request, every middleware in it will be executed.

$routeMiddleware attribute:

This attribute is called routing middleware. Why is it called routing middleware? Because the middleware defined in this attribute can only be referenced when defining routes.
Assume this is the routing middleware we defined:

protected $routeMiddleware = [
    ...
    'auth' => \Illuminate\Auth\Middleware\Authenticate::class,
];

What if we want to use the \Illuminate\Auth\Middleware\Authenticate::class middleware?
Route::get('hello/laravel-china','XXController@index')->middleware('auth');
We called the middleware method when defining the route, and the parameter value is auth, like this When this route is accessed, the middleware will be executed. Understand! Very simple.

$middlewareGroups attribute:

This attribute is called a middleware group. Why is it called a middleware group? We talked about routing middleware before. Do you think it is troublesome to add routing middleware like this? For example, if we execute 10 middlewares, do we need to add 10 more when defining the route? With the middleware group, there is no need to be so troublesome. Let's take a look at how the middleware group is defined.

protected $middlewareGroups = [
    'web' => [
        \App\Http\Middleware\EncryptCookies::class,
        ...
    ],
    'api' => [
        ...
    ],
];

Okay, the above example is to define the format of the middleware group. For example, if we look at the key value web, it corresponds to an array, which is composed of multiple middlewares. Once we have defined it, how should we use it?
When we declare the route, we can call it like this.

Route::group(['middleware' => 'web'],function($route){
    $route->get('hello/world',function(){});
    $route->get('hello/php',function(){});
    // 这样在访问这个这些路由的时候，就会执行中间件组 web 所对应的中间件，方便多了，批量式的。
});

Summary:

$middleware: Global middleware, when you need to do some processing on all requests, it is suitable to be defined in this attribute. (For example, counting the number of requests)
$middlewareGroups: Middleware groups. For example, when our project has api requests and web requests, we need to separate the two types of request middleware. At this time, we need middleware The components are assembled.

$routeMiddleware: Routing middleware. For some individual requests, when we need to execute special middleware, it is suitable to define it in this attribute.

Quote: https://laravel-china.org/topics/7392/laravel-three-middleware-functions

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