Socket.io and PHP - php

Question

Can someone please tell me if socket.io is only useful if the page your clients will use is a HTML page.
I want to create a node server that can push events to my existing PHP pages.
The pages are different and not suffixed with html.
All the examples I read use Chatroom examples with Index.html etc.
I simply want to know if what I want to do is even feasible.
Many thanks in advance.

Answer 1

When you write a php page the output is html. I hope that answers your question

Answer 2

PHP and socket.io work together. The only difference between doing it with html and with PHP is the way you link the two together (the common tutorial shows a way that only works with html, but there is another way that works with both html and php).
Try something like this (from a similar answer of mine, https://stackoverflow.com/a/25189436/3842050):
var socket = require('socket.io');
var express = require('express');
var http = require('http');
var app = express();
var server = http.createServer(app);
var io = socket.listen(server);
Then remove the app.use and app.get as they are no longer needed for how this is going to be done. Then add server.listen(8000); at the end of the server.js. For dependencies, use: <script src="//cdn.socket.io/socket.io-1.0.0.js"></script>. Then, to run your server, go to it in terminal and type node server.js. Then just connect to it with your client. Also, for events, in the server, use:
io.on('connection', function (client) {
client.on('someEvent', function(someVariables){
//Do something with someVariables when the client emits 'someEvent'
io.emit('anEventToClients', someData);
});
client.on('anotherEvent', function(someMoreVariables){
//Do more things with someMoreVariables when the client emits 'anotherEvent'
io.emit('anotherEventToClients', someMoreData);
});
});
And in your client code:
socket.emit('someEvent', variables);
socket.on('anEventToClients', function(something){
//Code when anEventToClient is emitted from the server
});