:sig
bool ws_send_to(String connection_id, String message, bool binary = false)

:params
connection_id : ID of the target WebSocket client
message : message payload to send
binary : set to true to send a binary frame instead of a text frame
return value : true if the target connection exists and the message was queued

:desc
Queues a WebSocket message for one specific connected client.

:see
>websocket

: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