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@ 2018-05-16T20:22:12Z

<?php

class EventBus
{
    public function addEventListener(Listener $listener)
    {
        $this->listeners[] = $listener;
    }

    public function dispatch(Event ...$events)
    {
        foreach($events as $event){
            foreach($this->listeners as $listener){
                $listener->when($event);
            }
        }
    }
}

abstract class Listener
{
    public function __construct(EventBus $bus)
    {
        $bus->addEventListener($this);
    }

    public function when(Event $event)
    {
        $method = explode('\\', get_class($event));
        $method = 'on' . end($method);
        if (method_exists($this, $method)) {
            $this->$method($event);
        }
    }
}

class SendEmailListener extends Listener
{    
    public function onMemberRegistered(Event $event)
    {
        // send email
    }
}

$eventBus = new EventBus;
new SendEmailListener($eventBus);

Output for git.master, git.master_jit, rfc.property-hooks: Deprecated: Creation of dynamic property EventBus::$listeners is deprecated in /in/LTG2d on line 7

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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