The Broadcasting Mental Model

In standard web applications, communication is strictly client-pull:

• Client Pull (HTTP Request-Response): The browser asks, and the server answers. If something changes on the server, the browser cannot know unless it polls (setInterval(fetch, 2000)), wasting bandwidth, CPU, and database queries.
• Server Push (Broadcasting): A lightweight pipeline (WebSocket or SSE) remains connected. The instant an event occurs in PHP, calling broadcast(new Event()) pushes the payload to all subscribed browsers in milliseconds.

[ PHP Backend Action ]
        │
        ▼ (triggers event)
broadcast(new OrderStatusUpdated($id, 'Cooking'))
        │
        ▼ (driver sends payload)
[ Broadcaster Engine: SSE or WebSocket ]
        │
        ▼ (pushes frame over open socket)
[ Client Browser Frontend ]
        │
        ▼ (receives event within ~10ms)
DOM updates without page reload