How to use PHP and the Lumen framework for lightweight application development

With the rapid development of the Internet and the increasing maturity of cloud computing, more and more people are paying attention to the development of lightweight applications. Among them, the PHP language and the Lumen framework are widely recognized and used as one of the excellent choices for lightweight application development.

So, in this article, we will introduce in detail how to use PHP and Lumen framework for lightweight application development from the following aspects.

1. Introduction to PHP language

PHP is a server-side scripting language widely used in Web development. It is easy to use, easy to learn, and highly stable. It has been widely used by developers. the favor of the reader. Using the PHP language, we can easily implement dynamic Web pages, process form data, connect to databases and other functions, which greatly facilitates the development of Web applications.

2. Introduction to Lumen Framework

Lumen is a lightweight web framework based on PHP language that can quickly build high-performance web applications. As a microservice version of the Laravel framework, Lumen greatly simplifies application development and also provides many useful tools and extensions, such as Eloquent ORM, middleware, etc.

3. Install the Lumen framework

Before using the Lumen framework for application development, we need to install the Lumen framework first.

1. First, we need to open the terminal and install composer using the following command:

php -r "copy('https://install.phpcomposer.com/installer', 'composer-setup.php');"
php composer-setup.php
php -r "unlink('composer-setup.php');"

2. Install the Lumen framework

Use the following command to install in our project directory Lumen framework:

composer create-project --prefer-dist laravel/lumen blog

After the installation is complete, we can start using the Lumen framework for application development.

4. Create a route

In the Lumen framework, we need to first define the route, bind the HTTP request to the corresponding method of the application, and return the response result. The following is a simple route definition example:

$app->get('/', function () use ($app) {
    return $app->version();
});

In this example, we define a route using the GET method, bind the application's root path "/" with the version method, and return the version execution results.

5. Create a controller

In the Lumen framework, the controller plays an important role in connecting routing and business logic. We can create a controller in the following ways:

1. Manually create a controller

We can manually create a PHP file and inherit the Controller class in the Lumen framework to create a controller.

For example, we can create a UserController.php file in the "app/Http/Controllers" directory and write the following code:

<?php

namespace AppHttpControllers;

class UserController extends Controller
{
    /**
     * 获取用户列表
     */
    public function getList()
    {
        $users = [
            ['id' => 1, 'name' => 'Tom'],
            ['id' => 2, 'name' => 'Jerry']
        ];
        
        return response()->json($users);
    }
}

In the controller, we define a The method getList that obtains the user list, and returns a JSON string of the user list in this method.

2. Use commands to create controllers

The Lumen framework provides commands for quickly generating controllers. We can use the following commands to create controllers:

php artisan make:controller UserController

6. Create Model

In the Lumen framework, the model plays an important role in connecting the database and business logic. We can create the model in the following ways:

1. Manually create the model

We can manually create the PHP file and inherit the Model class in the Lumen framework to create the model.

For example, we can create a User.php file in the "app/Models" directory and write the following code:

<?php

namespace AppModels;

use IlluminateDatabaseEloquentModel;

class User extends Model
{
    protected $table = 'users';
}

In the model, we define a User class, And bind it to the "users" table in the database.

2. Use commands to create models

The Lumen framework provides commands for quickly generating models. We can use the following commands to create models:

php artisan make:model User

7. Connect to the database

In application development, we usually need to connect to the database to store our data and operate on it. In the Lumen framework, we can connect to the database in the following ways:

1. Configure the database connection

In "config/database.php", we can modify the relevant configuration of the database connection, for example host, username, password and other information.

'mysql' => [
    'driver' => 'mysql',
    'host' => env('DB_HOST', 'localhost'),
    'port' => env('DB_PORT', '3306'),
    'database' => env('DB_DATABASE', 'forge'),
    'username' => env('DB_USERNAME', 'forge'),
    'password' => env('DB_PASSWORD', ''),
    'unix_socket' => env('DB_SOCKET', ''),
    'charset' => 'utf8mb4',
    'collation' => 'utf8mb4_unicode_ci',
    'prefix' => '',
    'strict' => true,
    'engine' => null,
],

2. Use Eloquent ORM

The Lumen framework also provides powerful Eloquent ORM tools that can help us easily operate the database. For example, here is an example using Eloquent ORM:

$user = new User();
$user->name = 'Tom';
$user->save();

$users = User::where('name', 'Jerry')->get();

In this example, we first create a user named Tom and save it to the database. Subsequently, we used Eloquent ORM to query the collection of all users named Jerry.

8. Deploy the application

After the application development is completed, we need to deploy it to the server, test and run it. Using the Lumen framework, deployment operations can be very simple.

1. Generate the key

Use the following command to generate the application key:

php artisan key:generate

2. Start the application

Use the following command to start the application :

php -S localhost:8000 -t public

In this command, we start a server, listen on the local port 8000, and point to the "public" directory to facilitate access to the application's entry file.

The above is a detailed introduction to lightweight application development using PHP and Lumen framework. I hope this article will be helpful to developers.

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