Registering Namespace

Annotation engine will search for annotation classes only on registered namespaces. It uses embedded dependency injection to obtain configuration. While this name might sound scary, without going into details, attaching namespaces can be done with one method call.

As for now PHP does not contain ::namespace magic constant, so it is highly advisable to define class constant pointing to namespace with const Ns = __NAMESPACE__

Attaching Configuration

use Maslosoft\Addendum\Addendum;
use Maslosoft\EmbeDi\Adapters\ArrayAdapter;
use Maslosoft\EmbeDi\EmbeDi;

$config = [
    'addendum' => [
        'class' => Addendum::class,
        'namespaces' => [
            'Acme\\Project\\Annotations'
        ]
    ]
];
EmbeDi::fly()->addAdapter(new ArrayAdapter($config));

The above snipped can be a bit more clean when used with one of annotations class with predefined Ns constant:

use Maslosoft\Addendum\Addendum;
use Maslosoft\EmbeDi\Adapters\ArrayAdapter;
use Maslosoft\EmbeDi\EmbeDi;
use Acme\Project\Annotations\MyAnnotation;

$config = [
    'addendum' => [
        'class' => Addendum::class,
        'namespaces' => [
            MyAnnotation::Ns
        ]
    ]
];
EmbeDi::fly()->addAdapter(new ArrayAdapter($config));

See also this repository and blog post for extra details.