PHP code example of silverstripe / event-dispatcher

1. Go to this page and download the library: Download silverstripe/event-dispatcher 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/ */

silverstripe / event-dispatcher example snippets


use SilverStripe\EventDispatcher\Dispatch\Dispatcher;
use SilverStripe\EventDispatcher\Symfony\Event;

Dispatcher::singleton()->trigger('createOrder', Event::create(
    null,
    [
        'id' => $order->ID,
        'paymentMethod' => $order->PaymentMethod
    ]
));


use SilverStripe\EventDispatcher\Dispatch\EventHandlerInterface;
use SilverStripe\EventDispatcher\Event\EventContextInterface;

class OrderHandler implements EventHandlerInterface
{
    public function fire(EventContextInterface $context): void
    {
        $orderID = $context->get('id');
        $paymentMethod = $context->get('paymentMethod');
        // Do something in response to the order being created
    }
}


use SilverStripe\EventDispatcher\Dispatch\DispatcherLoaderInterface;
use SilverStripe\EventDispatcher\Dispatch\EventDispatcherInterface;

class MyLoader implements DispatcherLoaderInterface
{
    public function addToDispatcher(EventDispatcherInterface $dispatcher) : void
    {
        $dispatcher->addListener('myEvent', $myHandler);
        $dispatcher->removeListener('anotherEvent', $anotherHandler);
    }
}


use SilverStripe\EventDispatcher\Dispatch\Dispatcher;
use SilverStripe\EventDispatcher\Symfony\Event;

Dispatcher::singleton()->trigger('formSubmitted', Event::create(
    'contact',
    [
        'name' => $formData['Name'],
        // etc..
    ]
));


public function trigger(string $event, EventContextInterface $context): void
{
    error_log($event);
    error_log($context->getAction());
    // ...


use SilverStripe\EventDispatcher\Dispatch\Dispatcher;
use SilverStripe\EventDispatcher\Symfony\Event;

Dispatcher::singleton()->trigger('formSubmitted', Event::create(
    'contact',
    [
        'name' => $formData['Name'],
        // etc..
    ]
));


public function fire(EventContextInterface $context): void
{
    $name = $context->get('Name');
    // do more stuff...
}