Php 如何使用socket.io向特定用户发送消息？

如何仅向具有我指定的特定ID的用户发送消息

例如，我有一个id为5的用户，我只想向他发送消息，而不是向所有连接的用户发送消息。当他连接时，应该如何将此id发送到服务器？有可能吗

客户

<?php
$id=5; // id to send to
echo '
<div id="id">'.$id.'</div>
<div id="messages"></div>
<input type="text" id="type">
<div id="btn">Press</div>
';
?>

<script>
$(document).ready(function(){
var id=$('#id').html();
var socket=io.connect('http://localhost:8010');
socket.on('connecting',function(){alert('Connecting');});
socket.on('connect',function(){alert('Connected');});
socket.on('message',function(data){message(data.text);});
function message(text){$('#messages').append(text+'<br>');}
$('#btn').click(function(){
    var text=$('#type').val();
    socket.emit("message",{text:text});
});
});
</script>

---

您可以在握手时将用户ID从客户端传递到服务器，并让用户加入组（例如“user5”）。然后可以向该组发射：

客户端：

var id=$('#id').html();
var socket=io.connect('http://localhost:8010', {
    query: 'userId=' + id
});

io.sockets.on('connection',function(client){
    var userId = client.handshake.query.userId;
    client.join('user' + userId);
    //from now each client joins his personal group...
    //... and you can send a message to user with id=5 like this:
    io.to('user5').emit('test', 'hello');

    //your further code
});

服务器端：

var id=$('#id').html();
var socket=io.connect('http://localhost:8010', {
    query: 'userId=' + id
});

io.sockets.on('connection',function(client){
    var userId = client.handshake.query.userId;
    client.join('user' + userId);
    //from now each client joins his personal group...
    //... and you can send a message to user with id=5 like this:
    io.to('user5').emit('test', 'hello');

    //your further code
});

---

您可以在握手时将用户ID从客户端传递到服务器，并让用户加入组（例如“user5”）。然后可以向该组发射：

客户端：

var id=$('#id').html();
var socket=io.connect('http://localhost:8010', {
    query: 'userId=' + id
});

io.sockets.on('connection',function(client){
    var userId = client.handshake.query.userId;
    client.join('user' + userId);
    //from now each client joins his personal group...
    //... and you can send a message to user with id=5 like this:
    io.to('user5').emit('test', 'hello');

    //your further code
});

服务器端：

var id=$('#id').html();
var socket=io.connect('http://localhost:8010', {
    query: 'userId=' + id
});

io.sockets.on('connection',function(client){
    var userId = client.handshake.query.userId;
    client.join('user' + userId);
    //from now each client joins his personal group...
    //... and you can send a message to user with id=5 like this:
    io.to('user5').emit('test', 'hello');

    //your further code
});

---

您可以在握手时将用户ID从客户端传递到服务器，并让用户加入组（例如“user5”）。然后可以向该组发射：

客户端：

var id=$('#id').html();
var socket=io.connect('http://localhost:8010', {
    query: 'userId=' + id
});

io.sockets.on('connection',function(client){
    var userId = client.handshake.query.userId;
    client.join('user' + userId);
    //from now each client joins his personal group...
    //... and you can send a message to user with id=5 like this:
    io.to('user5').emit('test', 'hello');

    //your further code
});

服务器端：

var id=$('#id').html();
var socket=io.connect('http://localhost:8010', {
    query: 'userId=' + id
});

io.sockets.on('connection',function(client){
    var userId = client.handshake.query.userId;
    client.join('user' + userId);
    //from now each client joins his personal group...
    //... and you can send a message to user with id=5 like this:
    io.to('user5').emit('test', 'hello');

    //your further code
});

---

您可以在握手时将用户ID从客户端传递到服务器，并让用户加入组（例如“user5”）。然后可以向该组发射：

客户端：

var id=$('#id').html();
var socket=io.connect('http://localhost:8010', {
    query: 'userId=' + id
});

io.sockets.on('connection',function(client){
    var userId = client.handshake.query.userId;
    client.join('user' + userId);
    //from now each client joins his personal group...
    //... and you can send a message to user with id=5 like this:
    io.to('user5').emit('test', 'hello');

    //your further code
});

服务器端：

var id=$('#id').html();
var socket=io.connect('http://localhost:8010', {
    query: 'userId=' + id
});

io.sockets.on('connection',function(client){
    var userId = client.handshake.query.userId;
    client.join('user' + userId);
    //from now each client joins his personal group...
    //... and you can send a message to user with id=5 like this:
    io.to('user5').emit('test', 'hello');

    //your further code
});