Test Symfony Events, modify event with Reflection

test.php

<?php

require 'vendor/autoload.php';
use Symfony\Component\Stopwatch\Stopwatch;
use Symfony\Component\EventDispatcher\EventDispatcher;
use Symfony\Component\EventDispatcher\Debug\TraceableEventDispatcher;
use Symfony\Component\EventDispatcher\GenericEvent;
use Symfony\Component\EventDispatcher\Event;

class EventSubscriber implements EventSubscriberInterface
{
    public static function getSubscribedEvents() {
        return array(
            'data.emit' => [['hello', 20],['world', 5],['eventful', 10]],
            'data.pass' => [['hello', 20],['world', 5],['eventful', 10]]
            );
    }
    public function __call($name, $args)
    {
        $event = $args[0];
        $subject = $event->getSubject();
        print_r($subject);
        if ($event->getName() === 'data.pass') {
            $r = new ReflectionClass($event);
            $property = $r->getProperty('subject');
            $property->setAccessible(true);
            unset($subject[$name]);
            $property->setValue($event, $subject);
        }
        print_r(array('name' => $name, 'data' => $event->getSubject()));
        return $event;
    }
}
$dispatcher = new TraceableEventDispatcher(new EventDispatcher(), new Stopwatch());
$es = new EventSubscriber();
$dispatcher->addSubscriber($es);

$event = new GenericEvent(array('hello' => 1, 'world' => 2, 'eventful' => 3));
$dispatcher->dispatch('data.emit', $event);
$dispatcher->dispatch('data.pass', $event);

print_r($dispatcher->getCalledListeners());
print_r($dispatcher->getNotCalledListeners());

foreach ($s->getSections() as $section) {
    print_r("section id: ". $section->getId() . "\n");
    foreach ($section->getEvents() as $event) {
        print_r("\tevent category: ". $event->getCategory()  . "\n");
        print_r("\tevent memory: ". $event->getMemory() . "\n");
        foreach ($event->getPeriods() as $period) {
            print_r("\t\tperiod time: ". $period->getDuration() . "\n");
            print_r("\t\tperiod memory: ". $period->getMemory() . "\n");
        }
    }
}