### Install Mercure Component

Source: https://github.com/symfony/mercure/blob/main/README.md

Install the Mercure component and a JWT library using Composer.

```bash
$ composer require symfony/mercure lcobucci/jwt
```

--------------------------------

### Publish an update

Source: https://github.com/symfony/mercure/blob/main/README.md

Example of setting up the JWT token provider and publishing an update using the Mercure Hub.

```php
// change these values accordingly to your hub installation
const HUB_URL = 'https://demo.mercure.rocks/.well-known/mercure';
const JWT_SECRET = '!ChangeThisMercureHubJWTSecretKey!';

// Set up the JWT token provider
// Alternatively, you can use the \Symfony\Component\Mercure\Jwt\StaticTokenProvider if you already have a JWT token
$jwFactory = new \Symfony\Component\Mercure\Jwt\LcobucciFactory(JWT_SECRET);
$provider = new \Symfony\Component\Mercure\Jwt\FactoryTokenProvider($jwFactory, publish: ['*']);

$hub = new \Symfony\Component\Mercure\Hub(HUB_URL, $provider);
// Serialize the update, and dispatch it to the hub, that will broadcast it to the clients
$id = $hub->publish(new \Symfony\Component\Mercure\Update('https://example.com/books/1.jsonld', 'Hi from Symfony!'));

```

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