What is middleware? Listen to Miejieshi Taiqu talk about laravel middleware (picture)

What is middleware? Listen to Master Mieke talk about laravel middleware (picture)

This article mainly introduces what is middleware? I heard Miaojueshi Taiqu talk about laravel middleware (picture), which has a certain reference value. Now I share it with everyone. Friends in need can refer to it

What is middleware? As the name suggests, middleware is the middleware, the middle layer, that filters some requests, such as some simple token verification; the following article explains in detail the methods and techniques of defining middleware and registering middleware in Laravel.

1. Define middleware

The labeled laravel can be defined directly in the command

php artisan make:middleware CheckToken

This way it is created There is a middleware class called CheckToken. This class is in the /app/Http/Middleware directory:

After clicking it, the code will look like this:

Then you can go and write something in it. For example:

public function handle($request, Closure $next)
{
    if($request->input('token')!='minxintoken'){
        return redirect()->to('http://www.baidu.com');
    }
    return $next($request);
}

The meaning is obvious. If the 'token' field in the sent data is not equal to minxintoken, then it will automatically jump to http://www.baidu.com

Of course, so far, we have only created a middleware called CheckToken, but it has not been enabled; now let’s enable it;

2. Register the middleware

The so-called activation is to register this middleware into the specified route;

There are two types of registration, global middleware and specified route middleware,

1. Global Middleware:

As long as the corresponding middleware is added to the array attribute $middleware of app/Http/Kernel.php, it will be ok: (CheckToken::class written directly in the original text will not work and will report to App\Http\ CheckToken does not exist, you need to add the namespace of CheckToken.php to get the CheckToken correctly)

The correct answer is as follows:

Enter sample.test/ directly in the browser about will jump directly to www.baidu.com, but it won’t work like this:

ok Global registration ends here. Generally speaking, global settings are not recommended. I don’t agree, because it is really annoying to bring the token every time;

2. Then let’s take a look at the middleware that specifies the route,

This kind of middleware To install the file, you first need to assign a key to the middleware in app/Http/Kernel.php and add it to $routeMiddleware in the file. There are already many default keys in it, just add one at the end:

After adding the key, go to the routing file and enable

Route::get('/','StaticPagesController@home')->middleware('token');

The effect of accessing the browser is to directly enter sample.test/ and it will be redirected to Baidu, and enter sample .test/?token=minxintoken can enter the homepage

Of course, the disadvantage of this is that you have to tap a route to use it, which is not normal; so Another cool operation is that there is an array called $middlewareGroups in the Kernel.php file: We add the CheckToken we just created in the web,

and then all The things in /route/web.php require token=minxintoken to access; for example, sample.test/ sample.test/about sample.test/help, etc.;

The above is the entire content of this article , I hope it will be helpful to everyone’s learning. For more related content, please pay attention to the PHP Chinese website!

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