What are the best practices for including classes in PHP files to ensure availability in all modules?

To ensure availability of classes in all modules in PHP files, it is best practice to use autoloading mechanisms such as Composer's PSR-4 autoloader. This allows you to define a namespace and directory structure for your classes, making them easily accessible throughout your project without the need for manual includes or requires. 

```php
// Composer autoloader setup
require 'vendor/autoload.php';

// Example class definition in a namespaced file
namespace MyApp;

class MyClass {
    // Class implementation here
}
```

By utilizing Composer's autoloader and organizing your classes into namespaces, you can ensure that your classes are readily available in all modules of your PHP project.

Keywords

Autoloading Namespaces Composer PSR-4 Dependency Injection

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