In-depth understanding of laravel's controller methods and routing

Laravel is a popular PHP framework that makes web development easier and faster by using simple, elegant syntax and powerful tools. In Laravel, routing is an important part of determining how HTTP requests are mapped to code in your application.

In Laravel, routing consists of HTTP verbs (GET, POST, PUT, etc.) and URI paths. In the route declaration, there is an arrow between the HTTP verb and the URI path pointing to the controller method that will handle the request.

Controller methods and routing in Laravel are closely related. The name of the controller method for the route and the name of the part defined in the URI path must be the same. Therefore, when declaring a route, you can bind a controller method to each URI path. This way, the controller method will be called every time a specific URI path is requested.

The name of the controller method is the same as the route name in Laravel. This is because Laravel routing uses PHP's reflection feature to parse route parameters. Therefore, the route name must exactly match the controller method name. If they don't match, Laravel won't be able to find the method.

For example, we have a controller called PostController, and this controller has a method called store. We want to submit the form via POST request to this method. We can add the following route in routes/web.php:

Route::post('/post', 'PostController@store');

In this example, the route URI is "/post" and the HTTP verb is POST. We will be able to find the controller named store in the PostController method to handle the request. We can use the route named "post.store" for URL generation.

Laravel also provides many other routing methods to simplify URL processing. You can use the route method to generate URLs instead of having to use hardcoded URLs. We can also use middleware to protect routes. For example, we can check whether the user has the correct permissions before the controller method is executed.

Laravel also provides some predefined routing methods, such as get, post, put, patch, delete, etc., which correspond to the HTTP GET, POST, PUT, PATCH and DELETE verbs respectively. These methods require two parameters, the first parameter is the requested URI path, and the second parameter is the controller method name.

When calling the routing method, you can also specify a name to identify the route. This is very useful as it allows us to generate a unique URL within our application without having to worry about the actual path of the URL. For example, define the following routing method in routes/web.php:

Route::get('/post/{id}', 'PostController@show')->name('post.show');

In this example, we define a route name called "post.show". This routing method uses the GET verb, URI path Is "/post/{id}", it will call the show method of PostController. Also notice that we defined a parameter called "id" in the URI path, which can be accessed in the controller method.

In short, in Laravel, method names and routes are related to each other, and together they form the basic architecture of the application. Therefore, when developing Laravel applications, developers need to have a deep understanding of routing and method names in order to design excellent applications.

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