Simple HTTP REST Controller wrapper for Silex based on https://gist.github.com/igorw/3646064

Controller\HomeController.php

<?php

namespace Controller;

class HomeController
{
	public function getAction($app)
	{
		return 'Hello!';
	}
}

index.php

<?php

chdir(__DIR__);

require('../vendor/autoload.php');

// Loader for app classes
spl_autoload_register(function($class) {

	$file = str_replace('\\', '/', $class);

	if(is_file(__DIR__ . '/' . $file . '.php')) {
		require __DIR__ . '/' . $file . '.php';
	}
});

use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\JsonResponse;

// Disable libxml errors
libxml_use_internal_errors(true);
date_default_timezone_set('GMT');

$app = new Silex\Application(); 
$app['debug'] = true;
$app['pdo'] = $app->share(function() {
	return new PDO(
    'mysql:dbname=____;host=localhost',
    'root',
    '',
    array(
        PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES utf8",
        PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_OBJ,
        PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
        PDO::ATTR_EMULATE_PREPARES => false
    )
});

$app->before(function (Request $request) {
    if (0 === strpos($request->headers->get('Content-Type'), 'application/json')) {
        $data = json_decode($request->getContent(), true);
        $request->request = new ParameterBag(is_array($data) ? $data : array());
    }
});

// https://gist.github.com/davedevelopment/4151421
// https://gist.github.com/ziadoz/7323919
// https://gist.github.com/igorw/3646064
$app->get('/{controllerName}', function ($controllerName) use ($app) {
    $controllerName = ucfirst($controllerName);
 
    $class = "Controller\\{$controllerName}Controller";
    $method = strtolower($app['request']->getMethod());

    if ( ! class_exists($class)) {
        $app->abort(404);
    }
    
    $reflection = new ReflectionClass($class);
    if ( ! $reflection->hasMethod($method . 'Action')) {
        $app->abort(404);
    }
 
    $controller = new $class();
    $result = $controller->{$method . 'Action'}($app);

	if($result instanceof Response) {
		return $result;
	}

	if($result instanceof JsonResponse) {
		return $result;
	}

	if(is_int($result)) {
		return $app->abort($result); // , $message, $headers
	}

	if(is_array($result)) {
    	$view = new View("$controllerName/$method");
		$view->set($result);
		return $view;
	}

	return $result;
})
->value('controllerName', 'home');
 

$app->finish(function (Request $request, Response $response) {
    //print 'after';
});

$app->run();