PHP code example of semperton / events

1. Go to this page and download the library: Download semperton/events library. Choose the download type require.

2. Extract the ZIP file and open the index.php.

3. Add this code to the index.php.

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

semperton / events example snippets


use Semperton\Events\ListenerProvider;

interface EventInterface{}
final class TestEvent implements EventInterface
{
	public $message = '';
}

$provider = new ListenerProvider();

$provider->addListener(TestEvent::class, function (TestEvent $event) {
	$event->message .= ' World';
});

$provider->addListener(EventInterface::class, function (EventInterface $event) {
	$event->message = 'Hello';
}, -1); // gets called first, because of higher priority (negatives allowed)


$myListener = function (TestEvent $event) {};

$provider->addListener(TestEvent::class, $myListener, 7);
$provider->removeListener(TestEvent::class, $myListener, 7); // priority must match too


use Semperton\Events\EventDispatcher;

// using the previously created ListenerProvider
$dispatcher = new EventDispatcher($provider);

$event = new TestEvent();

/** @var TestEvent */
$dispatchedEvent = $dispatcher->dispatch($event);

$dispatchedEvent === $event; // true
$dispatchedEvent->message; // 'Hello World'


$resolver = static function (string $class): object {
	return new $class();
};

$listener = new DelegateListener($resolver, Service::class, 'method');


// $container is a Psr\Container\ContainerInterface
$listener = new DelegateListener([$container, 'get'], Service::class, 'method');
$provider->addListener(TestEvent::class, $listener);