Publish and Subscribe with PHP

With Dapr, you can publish anything, including cloud events. The SDK contains a simple cloud event implementation, but you can also just pass an array that conforms to the cloud event spec or use another library.

<?php
$app->post('/publish', function(\DI\FactoryInterface $factory) {
    // create a new publisher that publishes to my-pub-sub component
    $publisher = $factory->make(\Dapr\PubSub\Publish::class, ['pubsub' => 'my-pubsub']);
    
    // publish that something happened to my-topic
    $publisher->topic('my-topic')->publish(['something' => 'happened']);
});

For more information about publish/subscribe, check out the howto.

Data content type

The PHP SDK allows setting the data content type either when constructing a custom cloud event, or when publishing raw data.

• CloudEvent
• Raw

<?php
$event = new \Dapr\PubSub\CloudEvent();
$event->data = $xml;
$event->data_content_type = 'application/xml';

<?php
/**
 * @var \Dapr\PubSub\Publish $publisher 
 */
$publisher->topic('my-topic')->publish($raw_data, content_type: 'application/octet-stream');

Receiving cloud events

In your subscription handler, you can have the DI Container inject either a Dapr\PubSub\CloudEvent or an array into your controller. The former does some validation to ensure you have a proper event. If you need direct access to the data, or the events do not conform to the spec, use an array.