Tell me the analogue of Node.JS EventEmitter for PHP 5.5

Question

PHP

Looking for a Node.JS equivalent of the EventEmitter module for PHP 5.5 (using a yield wrapper over libevent ). There is phpDaemon

using the old syntax , but it forces you to use awkward syntax with callback functions. Since the introduction of yield in PHP 5.5, code can be written much prettier without callback.