How to handle unknown type events and messages

If application receives event that has a type that is not supported by this SDK, it encapsulates the event to UnknownEvent'. UnknownMessage` is also the same.

So if you want to handle unknown type events and messages, you should check type of instance like so;

For unknown event

if ($event instanceof MessageEvent) {
    // do something...
} elseif ($event instanceof UnknownEvent) {
    // implement here!

    $eventBody = $event->getEventBody(); // <= array of raw event payload
    // do something...
}

###　For unknown message

if ($event instanceof MessageEvent) {
    if ($event instanceof TextMessage) {
        // do something
    } elseif ($event instanceof UnknownMessage) {
        // implement here!

        $messageBody = $event->getMessageBody(); // <= array of raw message payload 
        // do something
    }
}

UnknownMessage#getEventBody returns the array of raw event payload. It makes you to be able to implement the behavior of the event even if this SDK doesn't support the event type　（UnknownMessage#getMessageBody is also）.