My answer is simple. What is the maximal number of registered id's I can send within one message in php by using FCM.
$fields = array
(
'registration_ids' => $registrationIds,
'notification' => $notif,
'data' => $data
);
Other formulated: How many Id's can i push with
array_push($registrationIds,$id);
to registrationIds?
I found out that by around 500 id's the message was received by the last id, but by 1000 not. So is there a maximum or what could be the problem?