How to use Laravel9 framework in php?

With the development of network technology, Web applications have become an indispensable part of people's lives. In the development process of web applications, the PHP language is one of the most popular programming languages, and the Laravel framework is one of the leading, best, and most popular frameworks in the development process of PHP web applications.

The Laravel framework emerged to simplify common problems in the PHP web application development process, such as data query, form validation, security and other issues. This article will introduce the use of Laravel9 framework in detail.

1. Installation of Laravel9

First of all, in order to use Laravel9 in the project, we need to install it. We can install it using the Composer installation script officially provided by Laravel. Open the terminal and enter the following command to install:

composer create-project --prefer-dist laravel/laravel myproject

Here, myproject represents the name of your project.

2. Configuration of Laravel9

After successful installation, we need to perform some configurations on Laravel. First open the .env.example file in the project folder and rename it to .env. This file saves the basic configuration information of our project, such as database configuration, application key, email configuration, etc.

Modify the database configuration parameters in the .env file so that Laravel can connect to our database. The specific configuration method is as follows:

DB_CONNECTION=mysql
DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=laravel
DB_USERNAME=root
DB_PASSWORD=123456

In addition to database and email configuration,# There are other configuration variables in the ##.env file, which you can modify as needed.

3. Routing of Laravel9

Routing is an important concept in Laravel. Just like Google Map provides navigation, the program needs to know how to download different pages at different URLs.

We need to define a routing system to solve this problem. Open the

routes/web.php file in the project to start defining our routes.

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

This code means that when the project root path is opened, the corresponding

welcome view will be displayed. Among them, we use the Route::get() method to respond to the GET request and configure routing.

4. Laravel9’s database

Let’s introduce the database operations of Laravel9. Laravel provides a very easy-to-use DB Facade to perform database operations. At the same time, Eloquent ORM is also built-in for database operations.

namespace AppHttpControllers;

use IlluminateHttpRequest;
use AppModelsUser;

class UserController extends Controller
{
    public function index()
    {
        $users = User::all();

        return view('users.index', compact('users'));
    }
}

The above code shows how to use Laravel's Eloquent ORM to perform database operations and display the corresponding data through views. In the sample code, we obtain all user data from the

User model, and then return it to the view for display through the index method.

5. Views of Laravel9

In Laravel, views are usually managed in the

resources/views directory. This is where we write all the HTML, CSS, and JavaScript code for our application.

@extends('layouts.app')

@section('content')
    <div class="container">
        <div class="row justify-content-center">
            <div class="col-md-8">
                <div class="card">
                    <div class="card-header">Dashboard</div>

                    <div class="card-body">
                        @if (session('status'))
                            <div class="alert alert-success" role="alert">
                                {{ session('status') }}
                            </div>
                        @endif

                        You are logged in!
                    </div>
                </div>
            </div>
        </div>
    </div>
@endsection

The above code is a sample view file, which is defined in

resources/views/home.blade.php. @extends is used in the view file to inherit the header and sidebar views. In @section('content'), we define the HTML content of the main part. In the view file, we can use the Blade template engine provided by Laravel to achieve a more flexible rendering method.

6. Controller of Laravel9

The controller is one of the core components in Laravel. The role of the controller is to receive requests, process business logic, and then return the processing results to the view.

In Laravel, controllers are usually located in the

app/Http/Controllers directory and are created through the artisan command line tool:

php artisan make:controller UserController --resource

The above code will create a A controller named

UserController and allows us to access it via routing.

7. Writing tests for Laravel9

During the development process, testing is very useful, it can ensure the stability and correctness of our applications.

Laravel comes with the PHPUnit tester. There is a tests/ folder in the root directory of the Laravel application. This is where our test files are stored.

namespace TestsUnit;

use TestsTestCase;
use IlluminateFoundationTestingRefreshDatabase;
use AppModelsUser;

class UserTest extends TestCase
{
    use RefreshDatabase;

    /** @test **/
    public function a_user_can_have_a_name()
    {
        $user = factory(User::class)->create(['name' => 'John']);

        $this->assertEquals('John', $user->name);
    }
}

In this test, we test whether the user model can be created and have a name. Using the

factory() method, we created a user with the default name "John" and compared whether the user's name was returned correctly.

8. Conclusion

Laravel9 is a very powerful and flexible PHP framework. It provides many features that can help us write efficient, easy to maintain and scalable applications. In this article, we introduce the installation, configuration, routing, database, views, controllers and testing of Laravel9. We hope it can help you.

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