:sig
String ws_connection_id()

:params
return value : connection ID of the current WebSocket client

:see
>websocket

:content
Returns the runtime-generated connection ID of the client whose message is currently being handled.

This ID can be passed to `ws_send_to()` or `ws_close()` to target a single connected client.

Related:

- PHP: WebSocket connection metadata and send APIs in Ratchet, Workerman, or similar server frameworks
- JavaScript / Node.js: browser `WebSocket` properties and Node `ws` server-side connection inspection and send methods