What are best practices for naming and organizing class files in PHP applications?

When naming and organizing class files in PHP applications, it is best practice to follow a consistent naming convention and folder structure to improve code readability and maintainability. One common approach is to use the PSR-4 autoloading standard, which suggests organizing classes into namespaces that reflect the directory structure. This helps in easily locating and loading class files when they are needed.

// Example of organizing class files using PSR-4 autoloading standard

// File structure:
// - src/
//   - App/
//     - Controllers/
//       - HomeController.php
//     - Models/
//       - UserModel.php

// HomeController.php
namespace App\Controllers;

class HomeController {
    // Class implementation
}

// UserModel.php
namespace App\Models;

class UserModel {
    // Class implementation
}