I'm trying to send notification using a cron job. I migrated from GCM to FCM. In my server side, I changed https://android.googleapis.com/gcm/send to https://fcm.googleapis.com/fcm/send
and also updated on how to request the data changing registration_ids
to to
. Checking the json passed it is a valid json but I'm having an error Field "to" must be a JSON string
. Is there anyway to solve this?
Here is my code
function sendNotificationFCM($apiKey, $registrationIDs, $messageText,$id) {
$headers = array(
'Content-Type:application/json',
'Authorization:key=' . $apiKey
);
$message = array(
'to' => $registrationIDs,
'data' => array(
"message" => $messageText,
"id" => $id,
),
);
$ch = curl_init();
curl_setopt_array($ch, array(
CURLOPT_URL => 'https://fcm.googleapis.com/fcm/send',
CURLOPT_HTTPHEADER => $headers,
CURLOPT_POST => true,
CURLOPT_RETURNTRANSFER => true,
CURLOPT_POSTFIELDS => json_encode($message)
));
$response = curl_exec($ch);
curl_close($ch);
return $response;
}
Try explicitly converting $registrationIDs
to string
.
$message = array(
'to' => (string)$registrationIDs,
'data' => array(
"message" => $messageText,
"id" => $id,
),
);
Edited Answer
The 'to'
parameter requires a string
- which is the recipient of the message.
The $registrationIDs
could be passed a separate parameter (as string array) to 'registration_ids'
Edit your code to something like this:
$recipient = "YOUR_MESSAGE_RECIPIENT";
$message = array(
'to' => $recipient,
'registration_ids' => $registrationIDs,
'data' => array(
"message" => $messageText,
"id" => $id,
),
);
Where $recipient
is
a registration token, notification key, or topic.
Refer this: Firebase Cloud Messaging HTTP Protocol
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