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Laravel Quick Guide: Quickly Master the Laravel Framework

PHPzOriginal: 2023-08-26 20:39:251611browse

Laravel 速成指南：快速掌握Laravel框架

Introduction:
Laravel is a popular PHP development framework because of its simplicity, ease of use, rich functions and Efficient and favored by developers. This article aims to provide beginners with a quick guide to getting started with Laravel and help readers quickly master the basic concepts and usage of the Laravel framework through practical code examples.

Laravel installation and configuration
First, we need to install Composer in the system. Composer is a dependency management tool for PHP. Then, you can install Laravel through the following command:

composer global require laravel/installer

After the installation is complete, you can use the following command to create a new Laravel project:

laravel new myproject

The Laravel project contains a series of configuration files and folders, the most important of which are the config, routes, app and resources folders.

Routing and Controllers
Laravel uses routing to map URLs to corresponding controller methods. Define routing rules in the routes folder, for example:

Route::get('/hello', 'HelloController@index');

The corresponding controller method can be created in the app/Http/Controllers folder:

class HelloController extends Controller
{
    public function index()
    {
        return "Hello, Laravel!";
    }
}

Through the above code, when accessing the /hello URL, the index method of HelloController will be executed and the string "Hello , Laravel!".

View
Laravel provides powerful view functions that can easily organize and render HTML pages. View files can be created in the resources/views folder, for example hello.blade.php:

<!DOCTYPE html>
<html>
<head>
    <title>Hello Laravel</title>
</head>
<body>
    <h1>Hello, Laravel!</h1>
</body>
</html>

In the controller method, you can use view The function returns the view:

public function index()
{
    return view('hello');
}

When the /hello URL is accessed, the HTML content in the view will be rendered and displayed.

Database Operation
Laravel has built-in support for a variety of databases, and database operations can be performed through simple code. First, configure the database connection information in the .env file, and then you can perform database queries in the following ways:

use IlluminateSupportFacadesDB;

$users = DB::table('users')->get();

foreach ($users as $user) {
    echo $user->name;
}

The above code will be retrieved from the users table Query all user records and print out the name of each user.

Form processing and validation
In Laravel, it is very convenient to process forms and validate user input. You can use the Form class to generate forms and the Validator class for form validation. The following is a simple example:

use IlluminateSupportFacadesValidator;
use IlluminateSupportFacadesInput;
use IlluminateSupportFacadesRedirect;

public function store()
{
    $rules = [
        'name' => 'required',
        'email' => 'required|email',
    ];
    
    $validator = Validator::make(Input::all(), $rules);
    
    if ($validator->fails()) {
        return Redirect::back()->withErrors($validator)->withInput();
    }
    
    // 保存数据到数据库
    // ...
    
    return redirect('/thank-you');
}

The above code defines a form validation rule. If the validation fails, return to the previous page and pass back the error message and user input data. Otherwise, the data will be saved to the database and redirected to the /thank-you page.

Conclusion:
Through the simple examples in this article, readers can quickly master the basic concepts and usage of Laravel. Laravel provides rich functions and convenient development methods, which help speed up the project development process. I hope this guide can help beginners and help everyone get started with the Laravel framework faster.

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