README

A simple PHP client to send messages with Firebase Cloud Messaging (FCM) using the HTTP v1 API.
It does not rely on the official Google SDK, only guzzlehttp/guzzle and firebase/php-jwt.

📦 Installation

Install via Composer:

composer require httd1/fcmclient

⚙️ Setup

Download the private key JSON file in the Firebase Console.

Place this file in your project, ex. firebase-credentials.json.

🚀 Usage

Send to a single device

<?php

require 'vendor/autoload.php';

use FcmClient\FcmClient;

try {

    // initialize client with service account JSON
    $client = new FcmClient(__DIR__ . '/firebase-credentials.json');

    // send notification
    $response = $client->send([
        'message' => [
            'token' => 'FCM_DEVICE_TOKEN_HERE',
            'notification' => [
                'title' => 'Hello!',
                'body'  => 'Test notification 🚀'
            ]
        ]
    ]);

    print_r($response);

} catch (\Throwable $e) {
    echo 'Error: ' . $e->getMessage();
}

Send to a topic

$response = $client->send([
    'message' => [
        'topic' => 'my_app_topic',
        'notification' => [
            'title' => 'Update',
            'body'  => 'Message sent to all subscribers of the topic'
        ]
    ]
]);

print_r($response);

Send with custom data payload

$response = $client->send([
    'message' => [
        'token' => 'FCM_DEVICE_TOKEN_HERE',
        'data' => [
            'action' => 'open_chat',
            'chat_id' => '12345'
        ]
    ]
]);

📚 References

Official FCM HTTP v1 API Documentation