A post on enums & interfaces. I didn't realize you could implement an interface on an enum!

This way you get the best of both worlds: the default implementations are neatly grouped in an enum, but others can extend using their own class implementing the interface.

enum ColorOption: string implements Color
{
    case Red = 'red';
    case Blue = 'blue';
    case Green = 'green';
 
    public function name(): string
    {
        return $this->value;
    }
}