Broadcasting trong Laravel là gì và khi nào nên dùng?

Broadcasting gửi dữ liệu thời gian thực đến client kết nối qua WebSocket.

• Tạo channel: php artisan make:channel OrderChannel xác định ai có thể lắng nghe.
• Broadcast event trong controller: broadcast(new OrderShipped($order)).
• Frontend dùng Laravel Echo đăng ký: Echo.channel("order." + orderId).listen("OrderShipped", (e) => { ... }).
• Use case: thông báo (tin nhắn mới xuất hiện ngay), presence channel (xem ai đang online), collaborative editing, live dashboard.
• Yêu cầu server hỗ trợ WebSocket (Pusher, Ably, hoặc self-hosted Soketi).
• Broadcasting tạo ra trải nghiệm real-time thay vì polling lãng phí tài nguyên.

Broadcasting sends real-time data to connected clients via WebSockets.

• Create channel: php artisan make:channel OrderChannel authorizing who can listen.
• Broadcast event in controller: broadcast(new OrderShipped($order)).
• Frontend with Laravel Echo subscribes: Echo.channel("order." + orderId).listen("OrderShipped", (e) => { ... }).
• Use cases: notifications (new message appears instantly), presence channels (show who's online), collaborative editing, live dashboards.
• Requires server supporting WebSockets (Pusher, Ably, or self-hosted Soketi).
• Broadcasting creates interactive real-time experiences vs. polling which wastes resources.