Send message via socket to a specific client with PHP Socket.IO - php

Question

I need to send a message to a client connected to a socket server but I need it to only be sent to a person, and not a broadcast as such. I have read that with the function to() of socket.IO it can be but I have implemented it in several ways and I do not get it, I send it to all.
this is my code
...
$socket->on('new message', function($message) use($socket)
{
$socket->emit("new message", array(
"username" => $socket->username,
"action" => "me",
"message" => [ "from" => $socket->username['WP_USER_DATA']['guid'], "type" => "user", "time" => date('H:i'), "message" => $message ]
)
);
//I NEED HELP HERE, PLEASE
$socket->broadcast->emit("new message", array(
"username" => $socket->username,
"action" => "chat",
"message" => [ "from" => $socket->username['WP_USER_DATA']['guid'], "type" => "", "time" => date('H:i'), "message" => $message ]
));
});
...

Answer 1

From the Socket.IO cheatsheet:
// sending to individual socketid (private message)
io.to(`${socketId}`).emit('hey', 'I just met you');
So for you, it's something like:
//I NEED HELP HERE, PLEASE
io->to($socketId)->emit("new message", array(
"username" => $socket->username,
"action" => "chat",
"message" => [ "from" => $socket->username['WP_USER_DATA']['guid'], "type" => "", "time" => date('H:i'), "message" => $message ]
));
Note: you need to store (in array) the ids ($socket->id) of the clients when they connected, and use the one you need as $socketId in the example above.