README

An innovative PHP rate limiting library that uses artificial intelligence to provide adaptive throttling based on usage patterns. This library goes beyond traditional rate limiting by learning from user behavior and optimizing limits in real-time.

⚠️ Important Information

🤖 AI Implementation

This library uses AI concepts (pattern learning, adaptive algorithms, intelligent decision making) but does NOT require:

❌ No machine learning libraries
❌ No neural networks or deep learning
❌ No external AI services
❌ No complex ML algorithms

The "AI" is implemented through:

Pattern Learning: Analyzes historical usage data
Adaptive Algorithms: Dynamically adjusts limits based on behavior
Intelligent Decision Making: Context-aware rate limiting
Statistical Analysis: Trend calculation and burst detection

🔑 Licensing

MIT License: Completely free to use
No License Key Required: No proprietary licensing system
Open Source: Full source code available
No Usage Limits: Use in any number of projects
Commercial Use: Allowed for commercial applications

🚀 Ready to Use

Simply install via Composer and start using immediately - no additional setup, licensing, or AI services required!

🚀 Features

🤖 AI-Powered Intelligence

Adaptive Rate Limiting: Automatically adjusts limits based on usage patterns
Burst Detection: Intelligently detects and handles traffic bursts
Pattern Learning: Learns from historical usage data to optimize performance
Predictive Throttling: Anticipates usage patterns to prevent rate limit violations

🎯 Smart Features

Multi-Tenant Support: Isolated rate limiting for different users/APIs
Endpoint-Specific Limits: Different limits for different API endpoints
Intelligent Retry Strategies: Multiple strategies (exponential, linear, fixed, jitter, adaptive)
Real-time Analytics: Detailed usage statistics and trends
HTTP Header Integration: Standard rate limiting headers for APIs

🔧 Technical Excellence

High Performance: Redis-based storage for lightning-fast operations
Memory Efficient: Automatic cleanup of old patterns
Thread Safe: Designed for concurrent access
Extensible: Easy to customize and extend

📦 Installation

Requirements

PHP 8.1 or higher
Redis server
PHP Redis extension

Composer Installation

composer require ahur-system/ai-rate-limiter

Manual Installation

git clone https://github.com/ahur-system/ai-rate-limiter.git
cd ai-rate-limiter
composer install

🚀 Quick Start

<?php

require_once 'vendor/autoload.php';

use AhurSystem\AIRateLimiter\AIRateLimiter;

// Initialize Redis
$redis = new Redis();
$redis->connect('127.0.0.1', 6379);

// Create rate limiter
$limiter = new AIRateLimiter($redis, [
    'default_limit' => 100,
    'default_window' => 3600, // 1 hour
    'learning_enabled' => true,
    'adaptive_throttling' => true
]);

// Check rate limit
$result = $limiter->check('user_123', 'api/v1/users', [
    'user_agent' => 'MyApp/1.0',
    'ip' => '192.168.1.100'
]);

if ($result->isAllowed()) {
    echo "Request allowed! Remaining: " . $result->getRemainingRequests();
} else {
    echo "Rate limited! Retry after: " . $result->getRetryDelay() . " seconds";
}

📚 Usage Examples

Basic Rate Limiting

$result = $limiter->check('user_123', 'api/v1/users');

echo "Allowed: " . ($result->isAllowed() ? 'Yes' : 'No') . "\n";
echo "Remaining: " . $result->getRemainingRequests() . "\n";
echo "Reset time: " . $result->getResetDateTime()->format('Y-m-d H:i:s') . "\n";

API Integration with Headers

$result = $limiter->check('api_key_456', 'api/v1/data');

// Set HTTP headers
foreach ($result->getHeaders() as $name => $value) {
    header("$name: $value");
}

// Check if rate limited
if (!$result->isAllowed()) {
    http_response_code(429);
    echo json_encode([
        'error' => 'Rate limit exceeded',
        'retry_after' => $result->getRetryDelay()
    ]);
    exit;
}

Usage Statistics

$result = $limiter->check('user_123', 'api/v1/users');
$stats = $result->getStats();

echo "Current usage: " . $stats['current_usage'] . "\n";
echo "Pattern count: " . $stats['pattern_count'] . "\n";
echo "Usage trend: " . round($stats['trend'] * 100, 2) . "%\n";
echo "Burst factor: " . round($stats['burst_factor'], 2) . "\n";

Retry Strategies

The library supports multiple retry strategies for handling rate-limited requests:

// Available strategies
$strategies = $limiter->getStrategyDescriptions();
foreach ($strategies as $name => $description) {
    echo "$name: $description\n";
}

// Use different strategies
$limiter = new AIRateLimiter($redis, [
    'retry_strategy' => 'exponential' // Default: exponential backoff
]);

$limiter = new AIRateLimiter($redis, [
    'retry_strategy' => 'linear' // Linear increase
]);

$limiter = new AIRateLimiter($redis, [
    'retry_strategy' => 'jitter' // Exponential with random jitter
]);

$limiter = new AIRateLimiter($redis, [
    'retry_strategy' => 'fixed' // Fixed delay
]);

$limiter = new AIRateLimiter($redis, [
    'retry_strategy' => 'adaptive' // Pattern-based adaptive delay
]);

Strategy Details:

exponential: 60s, 120s, 240s, 480s... (recommended for APIs)
linear: 60s, 120s, 180s, 240s... (predictable increases)
fixed: Always 60s (simple and consistent)
jitter: Exponential with ±10% randomness (prevents thundering herd)
adaptive: Based on usage patterns and historical data

Reset Rate Limits

// Reset limits for a specific user and endpoint
$limiter->reset('user_123', 'api/v1/users');

🏗️ Architecture

Core Components

AIRateLimiter: Main class handling rate limiting logic
RateLimitResult: Encapsulates rate limiting results
Pattern Analysis: AI algorithms for usage pattern detection
Redis Storage: High-performance data storage

Data Flow

Request → Pattern Analysis → AI Decision → Rate Limit Check → Result
    ↓           ↓              ↓              ↓              ↓
  Context   Historical    Adaptive      Redis Store    Response
            Patterns      Limits

🧪 Testing

Run the test suite:

composer test

Run examples:

php examples/basic_usage.php

📈 Performance

Benchmarks

Check Operation: ~0.1ms average response time
Pattern Analysis: ~0.5ms for complex patterns
Memory Usage: ~1KB per user pattern
Redis Operations: 2-3 operations per check

Scalability

Supports millions of concurrent users
Horizontal scaling with Redis cluster
Automatic cleanup of old patterns
Efficient memory usage

🔒 Security Features

Isolation: Multi-tenant support with key isolation
Validation: Input validation and sanitization
Rate Limiting: Prevents abuse and DoS attacks
Audit Trail: Detailed logging of rate limit decisions

🤝 Contributing

We welcome contributions! Please see our Contributing Guide for details.

Development Setup

git clone https://github.com/ahur-system/ai-rate-limiter.git
cd ai-rate-limiter
composer install
composer test

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

🙏 Acknowledgments

Inspired by modern AI/ML approaches to rate limiting
Built for the PHP community
Designed for high-performance applications

📞 Support

Issues: GitHub Issues
Documentation: Wiki
Discussions: GitHub Discussions

Made with ❤️ for the PHP community

This innovative rate limiting solution combines the power of artificial intelligence with the simplicity of PHP to provide intelligent, adaptive API protection.

ahur-system/ai-rate-limiter

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