UPGRADE FROM 2.3 to 2.4

Form

The constructor parameter $precision in IntegerToLocalizedStringTransformer is now ignored completely, because a precision does not make sense for integers.

EventDispatcher

The getDispatcher() and getName() methods from Symfony\Component\EventDispatcher\Event are deprecated, the event dispatcher instance and event name can be received in the listener call instead.

Before:

use Symfony\Component\EventDispatcher\Event;

class Foo
{
    public function myFooListener(Event $event)
    {
        $dispatcher = $event->getDispatcher();
        $eventName = $event->getName();
        $dispatcher->dispatch('log', $event);

        // ... more code
   }
}

After:

use Symfony\Component\EventDispatcher\Event;
use Symfony\Component\EventDispatcher\EventDispatcherInterface;

class Foo
{
    public function myFooListener(Event $event, $eventName, EventDispatcherInterface $dispatcher)
    {
        $dispatcher->dispatch('log', $event);

        // ... more code
    }
}

Uh oh!