Laravel事件监听器listener与事件订阅者Subscriber的区别

其实就一句话：
Each event can have multiple listeners, but a listener can't listen to more than a single event. If you want a class listening to many events, you should use the Event Subscribers.
每个事件均可有多个监听器，但是一个监听器只能监听一个事件。如果想在一个类中监听多个事件，就需要适用事件订阅者。