详解EventDispatcher事件分发组件

好处：

关注的事件不用一个个去注册。 取消关注的事件不用一个个去移除注册。

订阅者内部关注的事件是一个整体，要么全部关注要么全部不关注

实例

普通栗子

include "vendor/autoload.php";
use SymfonyComponentEventDispatcherEventDispatcher;
use SymfonyComponentEventDispatcherEvent;
class UserEvent extends Event
{
 public function name()
 {
 return "Cartman";
 }

 public function age()
 {
 return "24";
 }
}
$dispatcher = new EventDispatcher();
$dispatcher->addListener("user.name", function($event, $eventName, $dispatcher){
 echo "My name is Cartmann";
});
$dispatcher->addListener("user.name", function($event, $eventName, $dispatcher){
 echo "My name is {$event->name()} from Event instancen";
}, 10);
$dispatcher->addListener("user.age", function($event, $eventName, $dispatcher){
 echo "My age is 24n";
}, 10);
$dispatcher->addListener("user.age", function($event, $eventName, $dispatcher){
 echo "My age is {$event->age()} from Event instancen";
}, -10);
$dispatcher->dispatch("user.name", new UserEvent());
$dispatcher->dispatch("user.age", new UserEvent());

上面的例子输出

My name is Cartman from Event instance
My name is Cartman
My age is 24
My age is 24 from Event instance

事件订阅者栗子

通过Subscriber注册事件

include "vendor/autoload.php";
use SymfonyComponentEventDispatcherEventDispatcher;
use SymfonyComponentEventDispatcherEvent;
use SymfonyComponentEventDispatcherEventSubscriberInterface;
class BookEvent extends Event
{
 public $name = self::class;
}
class BookSubscriber implements EventSubscriberInterface
{
 public static function getSubscribedEvents()
 {
 return [
  "chinese.name" => "chineseNameShow",
  "english.name" => [
  ["englishNameShow", -10],
  ["englishNameAFter", 10],
  ],
  "math.name" => ["mathNameShow", 100]
 ];
 }
 public function chineseNameShow(Event $event)
 {
 echo "我是汉语书籍n";
 }
 public function englishNameShow(Event $event)
 {
 echo "我是英文书籍n";
 }
 public function englishNameAFter(Event $event)
 {
 echo "我是展示之后的英文书籍[来自于Event实例{$event->name}]n";
 }
 public function mathNameShow(Event $event)
 {
 echo "我是展示的数学书籍n";
 }
}
$dispatcher = new EventDispatcher();
$subscriber = new BookSubscriber();
$dispatcher->addSubscriber($subscriber);
$dispatcher->dispatch("english.name", new BookEvent());
$dispatcher->dispatch("chinese.name");
$dispatcher->removeSubscriber($subscriber);
$dispatcher->dispatch("math.name");

输出为内容：

我是展示之后的英文书籍[来自于Event实例BookEvent]
我是英文书籍
我是汉语书籍

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