AI Engine - Multi-Provider PHP Library

A powerful, flexible PHP library for integrating multiple AI providers into your applications. Supports Google Gemini, Meta Llama, and Groq with conversation history.

🚀 Features

• Multi-Provider Support: Gemini, Meta Llama, and Groq (Llama)
• Conversation Mode: Maintains chat history for context-aware responses
• Easy Provider Switching: Switch between providers on the fly
• System Instructions: Set AI personality/behavior per conversation
• Simple API: Intuitive interface that works out of the box
• Extensible: Easy to add new providers

📋 Requirements

• PHP 8.0 or higher
• json extension
• Composer

🛠️ Installation

composer require rajanvijayan/ai-engine

🔑 API Keys Setup

Create a test.ai-key file in your project root:

{
    "gemini": "YOUR_GEMINI_API_KEY",
    "meta": "YOUR_META_LLAMA_API_KEY",
    "groq": "YOUR_GROQ_API_KEY"
}

Get Your API Keys

Provider	URL	Notes
Gemini	makersuite.google.com	Google AI
Meta Llama	llama.meta.com	Official Meta API
Groq	console.groq.com	FREE tier available!

🚀 Quick Start

Basic Usage

<?php
require_once 'vendor/autoload.php';

use AIEngine\AIEngine;

// Create with Gemini (default)
$ai = new AIEngine('your-gemini-api-key');
$response = $ai->generateContent('Hello! How are you?');
echo $response;

Choose Provider

// Gemini
$ai = new AIEngine($geminiKey, ['provider' => 'gemini']);

// Meta Llama
$ai = new AIEngine($metaKey, ['provider' => 'meta']);

// Groq (Llama models)
$ai = AIEngine::create('groq', $groqKey);

Conversation Mode

$ai = AIEngine::create('groq', $groqKey);
$ai->setSystemInstruction("You are a helpful assistant.");

// Start a conversation
$ai->chat("My name is John");
$ai->chat("What's my name?");  // AI remembers: "John"

// Clear conversation
$ai->newConversation();

📚 API Reference

Constructor

new AIEngine($apiKey, $config = [])

Config Options:

[
    'provider' => 'gemini',     // 'gemini', 'meta', or 'groq'
    'model' => null,            // Model name (uses provider default if null)
    'timeout' => 60,            // Request timeout in seconds
    'enable_logging' => false   // Enable logging
]

Methods

Method	Description
generateContent($prompt)	Single prompt, no history
chat($message)	Send message with conversation history
newConversation()	Clear conversation history
getHistory()	Get conversation history array
setSystemInstruction($text)	Set AI personality/behavior
switchProvider($name, $apiKey)	Switch to different provider
getProviderName()	Get current provider name

Static Methods

Method	Description
AIEngine::create($provider, $apiKey)	Factory method
AIEngine::getModelsForProvider($provider)	List available models
AIEngine::getDefaultModels()	Get default model per provider

🤖 Available Models

Gemini

• gemini-2.0-flash (default)
• gemini-2.0-flash-lite
• gemini-2.5-flash
• gemini-2.5-pro

Meta Llama

• Llama-4-Maverick-17B-128E-Instruct-FP8 (default)
• Llama-4-Scout-17B-16E-Instruct
• Llama-3.3-70B-Instruct
• Llama-3.2-3B-Instruct
• Llama-3.2-1B-Instruct

Groq

• llama-3.3-70b-versatile (default)
• llama-3.1-8b-instant
• mixtral-8x7b-32768
• gemma2-9b-it

💬 Usage Examples

Simple Question

$ai = new AIEngine($apiKey);
$answer = $ai->generateContent('What is the capital of France?');
echo $answer;

Conversation with Memory

$ai = AIEngine::create('groq', $groqKey);
$ai->setSystemInstruction("You are a math tutor. Be concise.");

echo $ai->chat("What is 15 + 27?");      // "42"
echo $ai->chat("Multiply that by 2");     // "84" - remembers previous answer!

Switch Providers Mid-Session

$ai = new AIEngine($geminiKey);
echo $ai->getProviderName();  // "Gemini"

$ai->switchProvider('groq', $groqKey);
echo $ai->getProviderName();  // "Groq"

Error Handling

$response = $ai->chat('Hello');

if (is_array($response) && isset($response['error'])) {
    echo "Error: " . $response['error'];
} else {
    echo "AI: " . $response;
}

🧪 Testing

Interactive Test

php test.php

This launches an interactive chat where you can:

• Select a provider
• Chat with the AI
• Use /new to clear conversation
• Use /quit to exit

📁 Project Structure

ai-engine/
├── src/
│   ├── AIEngine.php              # Main engine class
│   └── Providers/
│       ├── ProviderInterface.php # Provider contract
│       ├── Gemini.php            # Google Gemini
│       ├── MetaLlama.php         # Meta Llama API
│       └── Groq.php              # Groq API
├── test.php                      # Interactive test
├── test.ai-key                   # API keys (JSON)
├── composer.json
└── README.md

🔧 Adding New Providers

1. Create a new class implementing ProviderInterface
2. Implement required methods: generateContent(), sendMessage(), startNewConversation(), getConversationHistory(), setSystemInstruction(), isConfigured(), getName()
3. Add the provider to AIEngine::createProvider()

🛡️ Error Handling

Common errors returned:

Error	Cause
Provider not properly configured	Invalid or missing API key
Invalid prompt	Empty or too long prompt
Error contacting API	Network or API issue

📄 License

MIT License - see LICENSE file.

🙏 Acknowledgments

• Google for Gemini API
• Meta for Llama API
• Groq for fast inference

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Made with ❤️ for the PHP community