Zend Framework

// in your library-folder:
class YourNS_Controller_Action_AMF extends Zend_Controller_Action
{
    protected $_server;

    public function init() {
        $this->_server = new Zend_Amf_Server();
        $this->_server->setClass($this);
        $this->_helper->viewRenderer->setNoRender(); 
        echo $this->_server->handle();
        exit;
    }
}

// in your application/controllers folder
class MyController extends YourNS_Controller_Action_AMF
{
    public function funcToBeCalledByFlash($a, $b) {
        return $a+$b;
    }
}

class YourNS_Controller_Action_AMF extends Zend_Controller_Action
{
    private $_server;
    private $_forbiddenMethods = array();
    private static $_originalTargetMethods = array();

    public function init () {
        $this->_server = new Zend_Amf_Server();
        $this->_server->setClass($this);
        // make a reflection of this class (YourNS_Controller_Action_AMF) and get all methods of it, so we can forbid them
        $this->_forbiddenMethods = array(); // TODO

        $this->_request = new Zend_AMF_Request_Http();

        // iterate over the requests bodies
        $responseBody = $this->_request->getAmfBodies();

        foreach($responseBody as $body) {
            // on each $body get its targetURI (dont forget about AMF0/AMF3-switching)
            // with $body->getTargetURI()
            $method = '...TODO:get the correct method out of target URI...';
            if (in_array($method, $this->_forbiddenMethods))
                throw new Zend_Amf_Server_Exception('Method "' . $method . '" must not be called');

            self::$_originalTargetMethods[] = $method;

            // now set the target URI to our own function
            // also concern 0/3 switch here
            $body->setTargetURI('TODO:getthecorrectleading'.'handlerFunction');
        }

        // now handle it
        echo $this->_server->handle();
        exit;
    }

    public function handlerFunction() {
        $method = array_shift(self::$_originalTargetMethods);
        // TODO: make a reflection of $this and call $method on it with this functions arguments
        // TODO: now you can look inside the response created in your function
        return $this->_response->getBody();
    }
}

public function indexAction()
	{
		try {
			Zend_Registry::get('logger')->log('creating amf server', Zend_Log::DEBUG);
			$server = new Zend_Amf_Server();
			$server->setProduction(false);
			
			$classes = glob(APPLICATION_PATH.'/models/*.php');
			foreach ($classes as $class) {
				$class = basename($class);
				$class = substr($class, 0, strlen($class) - 4);
				$server->setClassMap($class, $class);
			}
			
			$fileName = basename(
				$this->getRequest()->getParam('service', 'Default').
				'Service.php'
			);
			
			// check if service really exists
			if (!file_exists(APPLICATION_PATH.'/services/OurNs/'.$fileName)) {
				throw new Zend_Amf_Exception('Service '.
					$this->getRequest()->getParam('service', 'Default').
					' not found!');
			}
			$server->setClass('OurNs_'.
				$this->getRequest()->getParam('service', 'Default').
				'Service');
			
			$response = $server->handle();
			Zend_Registry::get('logger')->log('responding', Zend_Log::DEBUG);
			echo $response;
		} catch (Exception $e) {
			Zend_Registry::get('logger')->log('Error handling AMF-Request: '.
				$e->getMessage()."\n".$e->getTraceAsString(), Zend_Log::ERR);
		}
		exit;
	}