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As mentioned back in part 1, PSR-14 splits the core mediator into two objects: The Dispatcher and the Provider. The Dispatcher is fairly straightforward and most implementations will be fairly simple and fairly similar.

Providers are the exact opposite; A Listener Provider has one requirement: It maps the Event object into an iterable of callables, in the order it chooses. How it does that is left up to the Provider to define, and there are dozens of possible ways.

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