PHP Mini Framework

PHP Mini Framework is a fast and lightweight micro-framework for building web applications with expressive and elegant syntax. This framework is a fork of Laravel Lumen that has been specifically modified and enhanced with modern PSR standards implementation, with a unique focus on seamless PSR-15 middleware integration using Laravel Pipeline as its dispatcher. This innovative approach delivers optimal performance while maintaining developer-friendly experience and universal middleware compatibility for modern PHP applications.

Table of Contents

• Framework Architecture
• MiddlewareTransformer: The Core
• Installation and Usage
• Testing and Quality Assurance
• Documentation and Resources
• Community & Support
• License

Framework Architecture

PSR Standards Implementation

Modern PSR standards implementation for interoperability (PSR-3, 7, 11, 15):

• PSR-3: Logger Interface with Monolog integration for systematic logging
• PSR-7: HTTP Message Interface (ServerRequest/Response) for standard HTTP communication
• PSR-11: Container Interface with auto-wiring for dependency injection
• PSR-15: HTTP Server Request Handlers & Middleware for processing pipeline

Core Architecture

1. Application: Integrated PSR-15 RequestHandler + PSR-11 Container
2. HTTP Layer: PSR-7 messages with Laravel-style helpers for development ease
3. Routing: Fast nikic/fast-route with intelligent auto-response transformation
4. Middleware: PSR-15 pipeline with smart parameter injection and Laravel Pipeline as dispatcher

Key Features

Middleware with Auto Parameter Injection:

// Zero-config parameter injection for middleware
'middleware' => 'throttle:60,1|cache:3600,redis'

class ThrottleMiddleware implements MiddlewareInterface {
    public function __construct(
        private int $maxAttempts,    // Auto: 60
        private int $decayMinutes    // Auto: 1  
    ) {}
}

Smart Response Transformation:

return $user;                    // Model → JSON 201
return ['data' => $users];       // Array → JSON
return "Hello World";            // String → HTML

MiddlewareTransformer: The Core Innovation

Mini Framework's MiddlewareTransformer bridges PSR-15 middleware with Laravel Pipeline, enabling seamless integration of any PSR-15 middleware within Laravel's familiar ecosystem.

Core Transform Method:

public function transform(array $middlewares): array
{
    return array_map(function ($middleware) {
        return function (RequestInterface $request, Closure $next) use ($middleware) {
            return $this->resolveMiddleware($middleware)->process(
                $request,
                new PipelineRequestHandler($next)
            );
        };
    }, $middlewares);
}

How the Transform Process Works:

1. Input: Array of middleware definitions (strings, classes, instances)

   ['auth:api', 'throttle:60,5', CustomMiddleware::class]
   

2. Transform Output: Array of Laravel Pipeline-compatible closures

   [
       // Auth middleware closure with parameter
       function($request, $next) { 
           return (new AuthMiddleware('api'))->process(
               $request, 
               new PipelineRequestHandler($next)
           ); 
       },
   
       // Throttle middleware closure with parameters
       function($request, $next) { 
           return (new ThrottleMiddleware(60, 5))->process(
               $request, 
               new PipelineRequestHandler($next)
           ); 
       },
   
       // Custom middleware closure
       function($request, $next) { 
           return (new CustomMiddleware())->process(
               $request, 
               new PipelineRequestHandler($next)
           ); 
       }
   ]
   

3. Pipeline Execution: Laravel Pipeline processes each closure sequentially

   $pipeline = new Pipeline($container);
   $response = $pipeline
       ->send($request)
       ->through($transformedMiddlewares)  // Our closures
       ->then(fn (ServerRequestInterface $request): ResponseInterface => $then($request));
   

The Bridge Mechanism:

• Each closure receives Laravel Pipeline's ($request, $next) signature
• PipelineRequestHandler converts $next closure to PSR-15 RequestHandlerInterface
• PSR-15 middleware's process() method is called with proper interfaces
• Response flows back through the pipeline chain

PipelineRequestHandler - The Bridge:

class PipelineRequestHandler implements RequestHandlerInterface
{
    public function __construct(private Closure $next) {}

    public function handle(ServerRequestInterface $request): ResponseInterface
    {
        return ($this->next)($request);  // Calls Laravel Pipeline's $next
    }
}

This simple adapter class enables PSR-15 middleware to call the next middleware in Laravel Pipeline by:

1. Wrapping Laravel's $next closure in PSR-15 RequestHandlerInterface
2. Converting Pipeline's $next($request) call to PSR-15's $handler->handle($request)
3. Maintaining the middleware chain flow without breaking either standard

Smart Parameter Injection:

// Definition: 'throttle:100,5'
// Resolves to: new ThrottleMiddleware(100, 5)
class ThrottleMiddleware implements MiddlewareInterface {
    public function __construct(private int $maxAttempts, private int $decayMinutes) {}
    
    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
    {
        // Your throttling logic here
        return $handler->handle($request);
    }
}

Key Benefits:

• Universal Compatibility: Any PSR-15 middleware works instantly
• Pipeline Integration: Maintains Laravel's familiar middleware execution flow
• Smart Resolution: Auto-injection with reflection and container integration
• Performance Optimized: Minimal overhead with efficient closure transformation

PSR-15 Middleware Examples

Basic Middleware:

class CustomMiddleware implements MiddlewareInterface {
    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
    {
        $request = $request->withAttribute('processed_at', time());
        $response = $handler->handle($request);
        return $response->withHeader('X-Processed-By', 'CustomMiddleware');
    }
}

Parameterized Middleware:

class ThrottleMiddleware implements MiddlewareInterface {
    public function __construct(private int $maxAttempts, private int $decayMinutes) {}
    
    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
    {
        // Throttling logic with injected parameters
        if ($this->exceedsLimit($request)) {
            return new JsonResponse(['error' => 'Too many requests'], 429);
        }
        return $handler->handle($request);
    }
}
// Usage: 'throttle:100,5' auto-injects maxAttempts=100, decayMinutes=5

Performance and Optimization

• Lightweight: Minimal overhead compared to full Laravel framework
• Fast Routing: nikic/fast-route + optimal auto-response transformation
• Smart Middleware: PSR-15 bridge with parameter injection for maximum flexibility
• Exception Safe: Bulletproof pipeline execution with proper error handling
• Terminable Lifecycle: Full support for middleware termination cleanup

Core Dependencies

Core libraries used:

• laminas/diactoros - PSR-7 HTTP message implementation
• nikic/fast-route - High-performance router
• illuminate/* - Laravel components (Container, Pipeline, etc.)
• spatie/ignition - Advanced error handling and debugging

What Makes Mini Framework Special?

PSR-15 Bridge with Laravel Pipeline - Seamlessly use any PSR-15 middleware within Laravel's pipeline ecosystem without compatibility issues.

Smart Parameter Injection - Auto-inject constructor parameters from middleware definitions using reflection with performance caching.

Universal Middleware Compatibility - Compatible with all existing PSR-15 middleware libraries, enabling code reuse across different frameworks.

Installation and Usage

System Requirements

• PHP 8.1 or higher
• Composer for dependency management

Installation Methods

Create New Application (Recommended)

# Create new application from starter template
composer create-project agungsugiarto/mini-application my-app
cd my-app

Install Framework Only

# Install framework as dependency
composer require agungsugiarto/mini-framework

Environment Configuration

# Create environment file
cp .env.example .env

# Configure database and other settings in .env
APP_ENV=local
APP_DEBUG=true
DB_CONNECTION=mysql
DB_HOST=127.0.0.1
DB_DATABASE=mini_framework

Quick Start - Simple Application

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

$app = new Mini\Framework\Application();

// Basic route
$app->router->get('/', function () {
    return 'Hello Mini Framework!';
});

// Route with parameters
$app->router->get('/api/users/{id}', function ($id) {
    return ['user_id' => $id, 'framework' => 'mini'];
});

// Route with middleware
$app->router->get('/protected', [
    'middleware' => 'auth:api',
    function () {
        return 'Protected content';
    }
]);

$app->run();

Middleware Usage Examples

Global Middleware:

$app->middleware([
    'cors',
    'throttle:60,1',
    CustomLoggerMiddleware::class
]);

Route-Specific Middleware:

$app->routeMiddleware([
    'auth' => AuthMiddleware::class,
    'throttle' => ThrottleMiddleware::class,
    'cache' => CacheMiddleware::class,
]);

$app->router->get('/api/data', [
    'middleware' => 'auth|throttle:100,5|cache:300',
    function () {
        return ['data' => 'sensitive information'];
    }
]);

Pipeline Execution Flow:

// 1. Middleware string parsing
'auth|throttle:100,5|cache:300' 
// Becomes: ['auth', 'throttle:100,5', 'cache:300']

// 2. MiddlewareTransformer.transform() output
[
    // Each closure wraps PSR-15 middleware in Laravel Pipeline format
    function($request, $next) { 
        $authMiddleware = new AuthMiddleware(); // No params
        return $authMiddleware->process($request, new PipelineRequestHandler($next)); 
    },
    function($request, $next) { 
        $throttleMiddleware = new ThrottleMiddleware(100, 5); // Auto-injected params
        return $throttleMiddleware->process($request, new PipelineRequestHandler($next)); 
    },
    function($request, $next) { 
        $cacheMiddleware = new CacheMiddleware(300); // Auto-injected param
        return $cacheMiddleware->process($request, new PipelineRequestHandler($next)); 
    }
]

// 3. Laravel Pipeline execution
$pipeline->send($request)
    ->through($transformedMiddlewares)
    ->then(fn (ServerRequestInterface $request): ResponseInterface => $then($request));

// Execution order: auth → throttle → cache → route handler → cache ← throttle ← auth

Custom PSR-15 Middleware:

class ApiKeyMiddleware implements MiddlewareInterface
{
    public function __construct(private string $requiredKey) {}
    
    public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
    {
        $apiKey = $request->getHeaderLine('X-API-Key');
        
        if ($apiKey !== $this->requiredKey) {
            return new JsonResponse(['error' => 'Invalid API key'], 401);
        }
        
        return $handler->handle($request);
    }
}

// Register and use
$app->routeMiddleware(['apikey' => ApiKeyMiddleware::class]);
$app->router->get('/secure', ['middleware' => 'apikey:secret123', $handler]);

Testing and Quality Assurance

The framework includes comprehensive testing capabilities with PHPUnit and custom testing traits to ensure code reliability and maintainability.

Running Tests

# Run all tests
./vendor/bin/phpunit

# Run with coverage report
./vendor/bin/phpunit --coverage-html coverage

# Test specific files
./vendor/bin/phpunit tests/FullApplicationTest.php
./vendor/bin/phpunit tests/Cors/CorsServiceTest.php

Test Configuration

# Copy phpunit configuration
cp phpunit.xml.dist phpunit.xml

# Customize test environment as needed

Documentation and Resources

Standards & Ecosystem

• PSR-15: HTTP Server Request Handlers | PSR-7: HTTP Message Interface
• Laravel Container | Laravel Pipeline

Project Links

• GitHub Repository | Packagist Package
• Starter Application

Community & Support

Get Help: GitHub Discussions • Issue Tracker • Documentation

Contribute: Contributors • GitHub Repository

License

MIT License - see LICENSE.md for complete details.

Mini Framework - Combining the power of PSR-15 with the ease of Laravel Pipeline for optimal development experience.