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<?php trait Delegator { private $delegates = []; protected function delegate($object, array $methods) { // check against duplicate methods $this->delegates[] = ['object' => $object, 'methods' => $methods]; } function __call($method, array $args) { foreach ($this->delegates as $delegate) { if (in_array($method, $delegate['methods'])) { return call_user_func_array([$delegate['object'], $method], $args); } } throw new Exception('Method not found!'); } } class AuthService { function authenticate($username, $password) { echo 'Doing the auth for ' . $username . '!'; } } class UserModel { use Delegator; function __construct(AuthService $auth) { $this->delegate($auth, ['authenticate']); } } $auth = new AuthService(); $model = new UserModel($auth); $model->authenticate('test', 'password');