whatsapp-chatgpt-bot-php

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whatsapp-chatgpt-bot-php

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A featured, easy-to-use, multimodal WhatsApp AI GPT-4o Chatbot in PHP for your Business. Supports GPT-4o with text + audio + image input, audio responses, and improved RAG + MCP Tools 🤩

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# WhatsApp ChatGPT Multimodal AI Chatbot in PHP 🤖

**A versatile PHP implementation of a WhatsApp AI Chatbot that's easy to customize 🎨, business-specific 🏢, general-purpose OpenAI GPT4o-powered 🤖 and Multimodal** 🎭 that works with [Wassenger WhatsApp API](https://wassenger.com) 📱.

**Now supports GPT-4o with text + audio + image input 📝🎵🖼️, audio responses** 🔊, and improved RAG with MCP tools 🛠️ and external functions for external API calls support 🌐

This PHP implementation is based on the [Node.js WhatsApp ChatGPT Bot](https://github.com/wassengerhq/whatsapp-chatbot-bot), providing full feature parity while following modern PHP best practices. If you prefer to use Node.js, check out the other implementation.

🚀 **[Get started for free with Wassenger WhatsApp API](https://wassenger.com/register)** in minutes by connecting your existing WhatsApp number and [obtain your API key](https://app.wassenger.com/apikeys) ✨

## Features

This PHP implementation provides a complete ChatGPT-powered AI chatbot that:

- 🤖 **Fully featured chatbot** for your WhatsApp number connected to Wassenger
- 💬 **Automatic replies** to incoming messages from users
- 🌍 **Multi-language support** - understands and replies in 90+ different languages
- 🎤 **Audio input/output** - transcription and text-to-speech capabilities
- 🖼️ **Image processing** - can analyze and understand images
- 👥 **Human handoff** - allows users to request human assistance
- ⚙️ **Customizable AI behavior** and instructions
- 🔧 **Function calling** capabilities for external data integration
- 📊 **Memory management** with conversation history and rate limiting
- 🚦 **Smart routing** with webhook handling and error management
- 🔒 **Secure** with proper error handling and logging

## Contents

- [Features](#features)
- [Quick Start](#quick-start)
- [Requirements](#requirements)
- [Configuration](#configuration)
  - [API Keys Setup](#api-keys-setup)
  - [Bot Customization](#bot-customization)
- [Usage](#usage)
  - [Local Development](#local-development)
  - [Production Deployment](#production-deployment)
  - [Deployment](#deployment)
    - [Deploy on Render](#deploy-on-render)
    - [Deploy on Heroku](#deploy-on-heroku)
    - [Deploy on Railway](#deploy-on-railway)
    - [Deploy on DigitalOcean App Platform](#deploy-on-digitalocean-app-platform)
    - [Deploy on Vercel](#deploy-on-vercel)
    - [Deploy on PlanetScale + Netlify](#deploy-on-planetscale--netlify)
    - [General Production Checklist](#general-production-checklist)
- [Architecture](#architecture)
- [Testing](#testing)
  - [Configuration Test](#configuration-test)
  - [API Connection Test](#api-connection-test)
  - [Webhook Test](#webhook-test)
  - [Manual Testing](#manual-testing)
- [Development](#development)
  - [Project Structure](#project-structure-1)
  - [Key Classes](#key-classes)
  - [Customization](#customization)
- [Customization](#customization-1)
  - [Bot Instructions](#bot-instructions)
  - [Function Calling](#function-calling)
  - [Rate Limiting](#rate-limiting)
- [API Endpoints](#api-endpoints)
- [Troubleshooting](#troubleshooting)
  - [Common Issues](#common-issues)
  - [Debug Mode](#debug-mode)
- [API Documentation](#api-documentation)
- [Production Deployment](#production-deployment-1)
  - [Apache/Nginx Setup](#apachenginx-setup)
  - [Environment Configuration](#environment-configuration)
  - [Security Considerations](#security-considerations)
  - [Performance Optimization](#performance-optimization)
- [Resources](#resources)
- [Contributing](#contributing)
- [License](#license)

## Quick Start

1. **Clone the repository:**
```bash
git clone https://github.com/wassengerhq/whatsapp-chatgpt-bot-php.git
cd whatsapp-chatgpt-bot-php
```

2. **Install PHP dependencies:**
```bash
composer install
```

3. **Configure environment:**
```bash
cp .env.example .env
# Edit .env file with your API keys (see Configuration section)
```

4. **Test the configuration:**
```bash
php tests/config-test.php
```

5. **Run the bot:**
```bash
# Development mode (with Ngrok tunnel)
composer run dev

# Or directly with PHP
php public/index.php

# Production mode (optionally set WEBHOOK_URL in .env first)
WEBHOOK_URL=https://my.server.com/webhook php public/index.php
```

## Requirements

- PHP 8.1 or higher
- Composer package manager
- [WhatsApp](https://whatsapp.com) Personal or Business number
- [Wassenger API key](https://app.wassenger.com/developers/apikeys) - [Sign up for free](https://wassenger.com/register)
- [OpenAI API key](https://platform.openai.com/account/api-keys) - Sign up for free
- [Ngrok](https://ngrok.com) account (for local development) - [Sign up for free](https://dashboard.ngrok.com/signup)

## Configuration

Edit the `.env` file with your API credentials:

```bash
# Required: Wassenger API key
# Get it from: https://app.wassenger.com/developers/apikeys
API_KEY=your_wassenger_api_key_here

# Required: OpenAI API key
# Get it from: https://platform.openai.com/account/api-keys
OPENAI_API_KEY=your_openai_api_key_here

# OpenAI model to use (gpt-4o, gpt-4, gpt-3.5-turbo)
OPENAI_MODEL=gpt-4o

# Required for local development: Ngrok auth token
# Get it from: https://ngrok.com/signup
NGROK_TOKEN=your_ngrok_token_here

# Optional: Specific WhatsApp device ID
DEVICE=

# Optional: Webhook URL for production deployment
WEBHOOK_URL=https://yourdomain.com/webhook

# Server configuration
PORT=8080
LOG_LEVEL=info
```

```bash
# Required: Wassenger API key - See instructions below
# Get it here: https://app.wassenger.com/developers/apikeys
API_KEY=your_wassenger_api_key_here

# Required: OpenAI API key - See instructions below
OPENAI_API_KEY=your_openai_api_key_here

# Required for local development: Ngrok auth token - See instructions below
NGROK_TOKEN=your_ngrok_token_here

# Optional: Specific WhatsApp device ID - only if you have multiple numbers in your Wassenger account
DEVICE=1234

# Optional: Webhook URL for production if you run the bot program on a cloud hosted server with a public URL
WEBHOOK_URL=
```

## Configuration

### API Keys Setup

1. **Wassenger API Key**:
   - Sign up at [Wassenger](https://app.wassenger.com)
   - Go to [API Keys](https://app.wassenger.com/developers/apikeys)
   - Create a new API key and copy it to `API_KEY` in `.env`

2. **OpenAI API Key**:
   - Sign up at [OpenAI](https://platform.openai.com)
   - Go to [API Keys](https://platform.openai.com/account/api-keys)
   - Create a new API key and copy it to `OPENAI_API_KEY` in `.env`

3. **Ngrok Token** (for local development):
   - Sign up at [Ngrok](https://ngrok.com)
   - Get your auth token from the dashboard
   - Copy it to `NGROK_TOKEN` in `.env`

### Bot Customization

Edit `src/Config/BotConfig.php` to customize:

- Bot instructions and personality
- Welcome and help messages
- Supported features (audio, images, etc.)
- Rate limits and quotas
- Whitelisted/blacklisted numbers
- Labels and metadata settings

## Usage

### Local Development

1. Start the development server:
```bash
composer run dev
```

2. The bot will:
   - Start a local HTTP server on port 8080
   - Create an Ngrok tunnel automatically
   - Register the webhook with Wassenger
   - Begin processing WhatsApp messages

3. Send a message to your WhatsApp number connected to Wassenger to test the bot.

### Production Deployment

1. Set environment variables on your server:
```bash
export WEBHOOK_URL=https://yourdomain.com/webhook
export API_KEY=your_wassenger_api_key
export OPENAI_API_KEY=your_openai_api_key
```

2. Deploy to your web server (Apache/Nginx) with document root pointing to `public/`

3. Make sure your server can receive POST requests at `/webhook`

### Deployment

For production deployment, you can use various cloud platforms. Here are detailed instructions for popular hosting services:

#### Deploy on Render

1. **Create a new Web Service** on [Render](https://render.com):
  - Connect your GitHub repository
  - Set build command: `composer install --no-dev --optimize-autoloader`
  - Set start command: `php -S 0.0.0.0:$PORT public/index.php`

2. **Configure environment variables** in Render dashboard:
  ```
  API_KEY=your_wassenger_api_key
  OPENAI_API_KEY=your_openai_api_key
  WEBHOOK_URL=https://your-app-name.onrender.com/webhook
  ```

3. **Add `render.yaml`** to your project root:
  ```yaml
  services:
    - type: web
     name: whatsapp-chatgpt-bot
     env: php
     buildCommand: composer install --no-dev --optimize-autoloader
     startCommand: php -S 0.0.0.0:$PORT public/index.php
     envVars:
      - key: ENV
        value: production
  ```

#### Deploy on Heroku

1. **Install Heroku CLI** and login:
  ```bash
  heroku login
  ```

2. **Create Heroku app**:
  ```bash
  heroku create your-whatsapp-bot
  ```

3. **Add `Procfile`** to your project root:
  ```
  web: php -S 0.0.0.0:$PORT public/index.php
  ```

4. **Configure environment variables**:
  ```bash
  heroku config:set API_KEY=your_wassenger_api_key
  heroku config:set OPENAI_API_KEY=your_openai_api_key
  heroku config:set WEBHOOK_URL=https://your-whatsapp-bot.herokuapp.com/webhook
  ```

5. **Deploy**:
  ```bash
  git add .
  git commit -m "Deploy to Heroku"
  git push heroku main
  ```

#### Deploy on Railway

1. **Connect repository** at [Railway](https://railway.app):
  - Import your GitHub repository
  - Railway auto-detects PHP projects

2. **Set environment variables** in Railway dashboard:
  ```
  API_KEY=your_wassenger_api_key
  OPENAI_API_KEY=your_openai_api_key
  WEBHOOK_URL=https://your-app.railway.app/webhook
  ```

3. **Add `nixpacks.toml`** (optional, for custom configuration):
  ```toml
  [phases.build]
  cmds = ["composer install --no-dev --optimize-autoloader"]

[phases.start]
  cmd = "php -S 0.0.0.0:$PORT public/index.php"
  ```

#### Deploy on DigitalOcean App Platform

1. **Create new app** on [DigitalOcean App Platform](https://cloud.digitalocean.com/apps):
  - Connect your GitHub repository
  - Choose PHP as runtime

2. **Configure app spec**:
  ```yaml
  name: whatsapp-chatgpt-bot
  services:
  - name: web
    source_dir: /
    github:
     repo: your-username/your-repo
     branch: main
    run_command: php -S 0.0.0.0:$PORT public/index.php
    environment_slug: php
    instance_count: 1
    instance_size_slug: basic-xxs
    envs:
    - key: API_KEY
     value: your_wassenger_api_key
     type: SECRET
    - key: OPENAI_API_KEY
     value: your_openai_api_key
     type: SECRET
  ```

3. **Set webhook URL** after deployment:
  ```
  WEBHOOK_URL=https://your-app-name.ondigitalocean.app/webhook
  ```

#### Deploy on Vercel

1. **Install Vercel CLI**:
  ```bash
  npm i -g vercel
  ```

2. **Add `vercel.json`** to project root:
  ```json
  {
    "functions": {
     "public/index.php": {
      "runtime": "vercel-php@0.6.0"
     }
    },
    "routes": [
     { "src": "/(.*)", "dest": "/public/index.php" }
    ],
    "env": {
      "ENV": "production"
    }
  }
  ```

3. **Deploy**:
  ```bash
  vercel --prod
  ```

4. **Set environment variables**:
  ```bash
  vercel env add API_KEY
  vercel env add OPENAI_API_KEY
  vercel env add WEBHOOK_URL
  ```

#### Deploy on PlanetScale + Netlify

1. **For Netlify**, add `netlify.toml`:
  ```toml
  [build]
    command = "composer install --no-dev"
    publish = "public"

[[redirects]]
    from = "/*"
    to = "/index.php"
    status = 200
  ```

2. **Set environment variables** in Netlify dashboard and configure webhook URL accordingly.

### General Production Checklist

After deploying to any platform:

1. **Test the webhook URL**:
  ```bash
  curl -X POST https://your-deployed-app.com/webhook \
    -H "Content-Type: application/json" \
    -d '{"test": true}'
  ```

2. **Monitor logs** for any errors during initial deployment

3. **Update Wassenger webhook** to point to your production URL

4. **Test with a real WhatsApp message** to ensure end-to-end functionality

5. **Set up monitoring** and alerts for your production environment

## Architecture

The PHP implementation follows a modern, object-oriented architecture:

```
src/
├── Api/                  # API clients
│   ├── OpenAIClient.php     # OpenAI API integration
│   └── WassengerClient.php  # Wassenger API integration
├── Bot/                  # Core bot logic
│   ├── ChatBot.php          # Main bot processing
│   └── FunctionHandler.php  # Function calling system
├── Config/               # Configuration management
│   └── BotConfig.php        # Centralized configuration
├── Http/                 # HTTP layer
│   ├── Router.php           # Request routing
│   └── WebhookHandler.php   # Webhook processing
├── Storage/              # Data storage
│   └── MemoryStore.php      # In-memory caching
└── Utils/                # Utilities
    ├── AppLogger.php        # Logging system
    └── NgrokTunnel.php      # Development tunneling
```

## Testing

The project includes several test utilities to validate your setup:

### Configuration Test
```bash
php tests/config-test.php
```
Validates that all configuration files load correctly and dependencies are installed.

### API Connection Test
```bash
php tests/api-test.php
```
Tests connectivity to Wassenger and OpenAI APIs with your configured keys.

### Webhook Test
```bash
php tests/webhook-test.php
```
Simulates a webhook request to test the message processing pipeline.

### Manual Testing
You can also test individual components:

```bash
# Test basic setup
php -r "require 'vendor/autoload.php'; echo 'PHP setup OK';"

# Check API keys
php -r "require 'vendor/autoload.php'; use Dotenv\Dotenv; Dotenv::createImmutable(__DIR__)->load(); echo 'API Key: ' . (\$_ENV['API_KEY'] ?? 'not set');"
```

## Development

### Project Structure

```
chatgpt-php/
├── public/
│   └── index.php           # Main entry point
├── src/
│   ├── Api/               # API integrations
│   ├── Bot/               # Core bot logic
│   ├── Config/            # Configuration
│   ├── Http/              # HTTP handling
│   ├── Storage/           # Data storage
│   └── Utils/             # Utility classes
├── tests/                 # Test utilities
├── vendor/                # Composer dependencies
├── .env.example          # Environment template
├── composer.json         # PHP dependencies
└── README.md
```

### Key Classes

- **`ChatBot`** - Main bot processing logic
- **`OpenAIClient`** - OpenAI API integration with chat, audio, and image support
- **`WassengerClient`** - Wassenger API integration for WhatsApp messaging
- **`Router`** - HTTP request routing and webhook handling
- **`BotConfig`** - Centralized configuration management
- **`MemoryStore`** - In-memory caching and conversation state management

### Customization

#### Bot Instructions
Edit the AI behavior in `src/Config/BotConfig.php`:

```php
public const BOT_INSTRUCTIONS = 'You are a helpful assistant...';
```

#### Function Calling
Add custom functions in `src/Bot/FunctionHandler.php`:

```php
public function getBusinessHours(): array {
    return [
        'monday' => '9:00 AM - 6:00 PM',
        'tuesday' => '9:00 AM - 6:00 PM',
        // ... more days
    ];
}
```

#### Rate Limits
Adjust limits in `src/Config/BotConfig.php`:

```php
public const LIMITS = [
    'maxInputCharacters' => 1000,
    'maxOutputTokens' => 1000,
    'chatHistoryLimit' => 20,
    // ... more limits
];
```

## Project Structure

```
whatsapp-chatgpt-chatbot-php/
├── composer.json          # Dependencies and autoloading
├── .env.example           # Environment configuration template
├── README.md              # This file
├── public/
│   └── index.php          # Web server entry point
└── src/
    ├── Api/
    │   ├── OpenAIClient.php      # OpenAI API client
    │   └── WassengerClient.php   # Wassenger API client
    ├── Bot/
    │   ├── ChatBot.php           # Main bot logic
    │   ├── MessageProcessor.php  # Message processing
    │   └── FunctionHandler.php   # AI function calling
    ├── Config/
    │   └── BotConfig.php         # Bot configuration
    ├── Http/
    │   ├── Router.php            # HTTP routing
    │   └── WebhookHandler.php    # Webhook processing
    ├── Storage/
    │   └── MemoryStore.php       # In-memory storage
    └── Utils/
        ├── Logger.php            # Logging utility
        └── NgrokTunnel.php       # Ngrok integration
```

## Customization

### Bot Instructions

Edit the bot's personality and instructions in `src/Config/BotConfig.php`:

```php
public const BOT_INSTRUCTIONS = 'You are a helpful customer support assistant...';
```

### Function Calling

Add custom functions in `src/Bot/FunctionHandler.php` to integrate with external APIs, databases, or services:

```php
private function getPlanPrices(): string
{
    // Your custom logic here
    return 'Plan pricing information...';
}
```

### Rate Limiting

Configure message limits and quotas in `src/Config/BotConfig.php`:

```php
public const LIMITS = [
    'maxInputCharacters' => 1000,
    'maxOutputTokens' => 1000,
    'maxMessagesPerChat' => 500,
    // ...
];
```

## API Endpoints

- `GET /` - Bot information and status
- `POST /webhook` - Webhook for incoming WhatsApp messages
- `POST /message` - Send message endpoint
- `GET /sample` - Send sample message
- `GET /files/{id}` - Temporary file downloads

## Troubleshooting

### Common Issues

1. **"No active WhatsApp numbers"**
   - Verify your Wassenger API key
   - Check that you have a connected WhatsApp device in Wassenger

2. **"WhatsApp number is not online"**
   - Ensure your WhatsApp device is connected and online in Wassenger dashboard

3. **Webhook not receiving messages**
   - Check that your webhook URL is accessible from the internet
   - Verify Ngrok tunnel is running (development mode)
   - Check firewall settings

4. **OpenAI API errors**
   - Verify your OpenAI API key is valid
   - Check your OpenAI account has sufficient credits
   - Ensure the model name is correct

### Debug Mode

Enable detailed logging by setting in `.env`:
```bash
LOG_LEVEL=debug
```

Then check the logs in your configured log directory.

## API Documentation

This bot integrates with:

- **[Wassenger API](https://docs.wassenger.com)** - WhatsApp messaging
- **[OpenAI API](https://platform.openai.com/docs)** - AI chat completions, audio transcription, text-to-speech
- **[Ngrok](https://ngrok.com/docs)** - Development tunneling

## Production Deployment

### Apache/Nginx Setup

1. **Document Root**: Point to the `public/` directory
2. **URL Rewriting**: Configure rewrite rules to route all requests to `index.php`

#### Apache (.htaccess)
```apache
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php [QSA,L]
```

#### Nginx
```nginx
location / {
    try_files $uri $uri/ /index.php?$query_string;
}

location ~ \.php$ {
    fastcgi_pass unix:/var/run/php/php8.1-fpm.sock;
    fastcgi_index index.php;
    fastcgi_param SCRIPT_FILENAME $realpath_root$fastcgi_script_name;
    include fastcgi_params;
}
```

### Environment Configuration

```bash
# Set your production webhook URL
WEBHOOK_URL=https://yourdomain.com/webhook

# Use production logging
LOG_LEVEL=error
```

### Security Considerations

- Keep `.env` file outside the web root or protect it via web server configuration
- Use HTTPS for all webhook endpoints
- Implement rate limiting at the web server level
- Monitor logs for suspicious activity
- Keep dependencies updated: `composer update`

### Performance Optimization

- Enable OPcache in production
- Use a proper web server (Apache/Nginx) instead of PHP's built-in server
- Consider using Redis or Memcached for session storage
- Implement proper caching strategies

## Resources

- [Wassenger Documentation](https://app.wassenger.com/docs)
- [OpenAI API Documentation](https://platform.openai.com/docs)
- [GitHub Issues](https://github.com/wassengerhq/whatsapp-chatgpt-bot-php/issues)

## Contributing

1. Fork the repository
2. Create a feature branch
3. Make your changes
4. Test thoroughly
5. Submit a pull request

## License

MIT License - see LICENSE file for details.

---

Built with ❤️ using PHP and the Wassenger API.

whatsapp-chatgpt-bot-php

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