dispatch.php

class ThingThatEmitsAnEvent
{
  private $dispatcher;
  public function __construct(EventDispatcher $dispatcher) {
    $this->dispatcher = $dispatcher;  
  }
  public function doAThing() {
    //Do Some Stuff
    $this->dispatcher->(Event::NAME, new Event());
  }
}

class ThingThatListens
{
  private $dispatcher;
  public function __construct(EventDispatcher $dispatcher) {
    $this->dispatcher = $dispatcher;
    $this->dispatcher->addListener("SomeEventName", function(Event $event) {
      $this->doSomething($event->getId());
    });
  }
  public doSomething($id) {
    //Do Something With ID
  }
}