How to use namespaces to manage code in PHP?

Namespaces in PHP are used to manage code, prevent name conflicts and enhance readability. Declare a namespace: use the namespace keyword. Using classes and functions in namespaces: Use class names and function names. Access classes and functions outside the namespace: use fully qualified names or the use keyword. Practical example: In Laravel, controllers and models are organized using namespaces.

Use namespaces to manage code in PHP

In PHP, namespaces are a way to group related code into different A scoping mechanism that helps prevent name conflicts and enhances code readability and maintainability.

How to declare a namespace

namespace MyProject\Models;

Use classes and functions in the namespace

class User
{
    // 类代码
}

function greet()
{
    // 函数代码
}

Access the namespace Classes and functions outside the namespace

To access classes or functions outside the namespace, use the fully qualified name:

\DateTime::now();

Alternatively, you can use the use keyword Introduce namespace elements into the current scope:

use MyProject\Models\User;
$user = new User();

Practical case

Consider a simple Laravel application with a controller named UserController , located in the app/Http/Controllers directory.

UserController.php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

class UserController extends Controller
{
    public function index()
    {
        // 控制器逻辑
    }
}

Model Class

namespace App\Models;

class User
{
    // 模型逻辑
}

By organizing the code into namespaces, we can easily Manage dependencies and avoid name conflicts between different modules and components.

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