Parenthesis is a closure
Equivalent of this: **'TopicA' in topic' || 'TopicB' in topics**
$topic = new Topics();
$topic->topic('TopicA')
->orTopic('TopicB');
Equivalent of this: **'TopicA' in topics && ('TopicB' in topics || 'TopicC' in topics)**
$topic = new Topics();
$topic->topic('TopicA')
->andTopic(function($condition) {
$condition->topic('TopicB')->orTopic('TopicC');
});
> Note: Only two operators per expression are supported by fcm
