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Update event_dispatcher.rst
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components/event_dispatcher.rst

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@@ -334,7 +334,9 @@ Dispatch the Event
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..................
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The :method:`Symfony\\Component\\EventDispatcher\\EventDispatcher::dispatch`
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method notifies all listeners of the given event. It takes two arguments:
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method notifies all listeners of the given event.
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It takes two arguments:
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the ``Event`` instance to pass to each listener of that event and the name
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of the event to dispatch::
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@@ -348,8 +350,16 @@ of the event to dispatch::
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// creates the OrderPlacedEvent and dispatches it
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$event = new OrderPlacedEvent($order);
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$dispatcher->dispatch($event, OrderPlacedEvent::NAME);
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// note that the second argument ``OrderPlacedEvent::NAME`` is optional,
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// read more below in the subscriber code part
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.. versionadded:: 4.3
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Since Symfony 4.3, note that the event name is now optional in the :method:`Symfony\\Component\\EventDispatcher\\EventDispatcher::dispatch` method,
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so you can pass just the event object as first argument::
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// ...
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// creates the OrderPlacedEvent and dispatches it
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$event = new OrderPlacedEvent($order);
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$dispatcher->dispatch($event);
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Notice that the special ``OrderPlacedEvent`` object is created and passed to
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the ``dispatch()`` method. Now, any listener to the ``order.placed``
@@ -392,10 +402,9 @@ Take the following example of a subscriber that subscribes to the
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['onKernelResponsePre', 10],
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['onKernelResponsePost', -10],
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],
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// when using two arguments, event and event name
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OrderPlacedEvent::NAME => 'onStoreOrder',
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// you can also subscribe this way if you pass only
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// the event object as first argument and omit the second
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// of the $dispatcher->dispatch method
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// when using only one argument, the event (Symfony 4.3+)
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OrderPlacedEvent::class => 'onStoreOrder',
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];
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}

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