In the context of PHP namespaces, what considerations should be made when naming folders for classes, especially when dealing with singular vs. plural naming conventions?

When naming folders for classes in PHP namespaces, it is important to consider whether to use singular or plural naming conventions. It is generally recommended to use singular names for folders to maintain consistency with class names, which are typically singular. This helps in easily mapping class names to folder names and makes the codebase more organized and readable.

```php
// Example of naming folders for classes using singular convention
namespace App\Models;

class User {
    // Class implementation
}
```
In this example, the folder name "Models" is singular to match the singular class name "User".