How to get Firebase target by PHP? - php

Question

I'm building an PHP website. I want to push notification to client(who login to my website) so I use Firebase Cloud Messaging.
I already registered Firebase app and write a function to send message
public function sendMessage($data, $target)
{
//FCM api URL
$url = 'https://fcm.googleapis.com/fcm/send';
//api_key available in Firebase Console -> Project Settings -> CLOUD MESSAGING -> Server key
$server_key = 'MY SERVER KEY';
$fields = array();
$fields['data'] = $data;
if (is_array($target)) {
$fields['registration_ids'] = $target;
} else {
$fields['to'] = $target;
}
//header with content_type api key
$headers = array(
'Content-Type:application/json',
'Authorization:key=' . $server_key
);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($fields));
$result = curl_exec($ch);
if ($result === FALSE) {
die('FCM Send Error: ' . curl_error($ch));
}
curl_close($ch);
return $result;
}
But I don't know how to get $target to let Firebase send message to.
Now I want when user register/login on my website, I will request token from Firebase and save it to my DB.
Because when I want send message to that user, I need provide target(token) for Firebase. Anyone please help me?

Answer 1

At first, client should have application that uses your firebase project.
Then you can sand message to it application, and you have 2 ways to do it:
You have to acquire his registration token
His app on smartphone should be registered in some topic, ex. "general".