ElggUser::getFriendsOf PHP Method

    public function getFriendsOf(array $options = [])
    {
        $options['relationship'] = 'friend';
        $options['relationship_guid'] = $this->getGUID();
        $options['inverse_relationship'] = true;
        $options['type'] = 'user';
        return elgg_get_entities_from_relationship($options);
    }