DownloadA simple php class to help you send firebase push notification from php curl. 
It will allow you to push cloud messaging through firebase in 3 different way. 
   1. Send to a single device id
   2. Send to a multiple device ids
   3. Send to a specific topic  subscribers 
Installation 
Installation is super-easy via Composer: 
composer require peterujah/php-firebase-notification
 
initialize the firebase class with your google api key 
use Peterujah\NanoBlock\FirebaseServiceModel;
use Peterujah\NanoBlock\FirebaseService;
define("GOOGLE_FCM_API_KEY", "AAAAtXpvsYU:APXXX");
$model = new FirebaseServiceModel();
$service = new FirebaseService(GOOGLE_FCM_API_KEY);
 
Sending a message to a single device id can be done like this. 
$model->setTo("f-bbVq2uCgY:APA91bF0s7jk5lXXy");
$model->setTitle("I code it here");
$model->setMessage("Will you like to join us?");
$response = $service->notify($model);
var_export($response);
 
Sending a message to a multiple user IDs can be done like this 
$model->setTo(array("User-A", "User-B", "User-C"));
$model->setTitle("I code it here");
$model->setMessage("Will you like to join us?");
$response = $service->notify($model);
var_export($response);
 
  Sending a message by topic IDs/name can be done like this 
$model->setIsTopic(FirebaseServiceModel::TOPIC);
$model->setTo("TOPIC_GROUP_ID_NAME");
$model->setTitle("I code it here");
$model->setMessage("Will you like to join us?");
$response = $service->notify($model);
var_export($response);
 
Methods 
Set the notification payload node type. The default is FirebaseServiceModel::NODE_NOTIFICATION 
$model->setNode(FirebaseServiceModel::NODE_NOTIFICATION | FirebaseServiceModel::NODE_DATA);
 
Sets the notification to send to topic. The default is false, pass FirebaseServiceModel::TOPIC or true, to enable topic. $model->setIsTopic(FirebaseServiceModel::TOPIC);
 
Sets the notification body, default is message $model->setBody($body);
 Sets the notification image url. $model->setImage("https://img.com/path/to/foo.png");
 
Sets the notification click action for android. $model->setClickAction($click);
 
Sets the notification refernce for custom use. $model->setReference($ref);
 
Sets the notification additional meta data for custom use. $model->setMeta($array);
 
Sets the notification badge id. $model->setBadge($int);
 
Sets the notification background state. $model->setIsBackground($bool);
 Sets the notification sound type. $model->setSound($sound);
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