PHP Firebase Notification (OOP)

A clean PHP OOP implementation for sending Firebase Cloud Messaging (FCM) notifications using Service Account + OAuth2 Bearer Token, without using Composer.

This project is Docker-ready and fully configurable for multiple environments.

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Features

• Pure OOP PHP structure
• Firebase OAuth2 token generation using Service Account JSON
• Automatic token refresh
• Supports single device notifications
• Data payload values automatically converted to strings (required by FCM)
• Docker-ready
• JSON output for API-friendly responses
• Easy to extend for multi-device or topic notifications

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Project Structure

• src/
  • config/
    • FirebaseConfig.php: Firebase configuration
  • classes/
    • FirebaseService.php: OAuth2 token handling
    • FirebaseNotification.php: Notification sending
  • send.php: Example entry point