server.php

<?php
// prevent the server from timing out
set_time_limit(0);

// include the web sockets server script (the server is started at the far bottom of this file)
require 'class.PHPWebSocket.php';
$numberOfConnections = 0;

// when a client sends data to the server
function wsOnMessage($clientID, $message, $messageLength, $binary) {
	global $Server;
	$ip = long2ip( $Server->wsClients[$clientID][6] );

	// check if message length is 0
	if ($messageLength == 0) {
		$Server->wsClose($clientID);
		return;
	}

	//The speaker is the only person in the room. Don't let them feel lonely.
	if ( sizeof($Server->wsClients) == 1 )
		$Server->wsSend($clientID, "There isn't anyone else in the room, but I'll still listen to you. --Your Trusty Server");
	else
		//Send the message to everyone but the person who said it
		foreach ( $Server->wsClients as $id => $client )
			if ( $id != $clientID )
				$Server->wsSend($id, $message);
}

// when a client connects
function wsOnOpen($clientID)
{
	global $Server, $numberOfConnections;
	$ip = long2ip( $Server->wsClients[$clientID][6] );
	$numberOfConnections++;

	$Server->log( "$ip ($clientID) has connected." );

	//Send a join notice to everyone but the person who joined
	foreach ( $Server->wsClients as $id => $client )
		$Server->wsSend($id, '{"type":"numberOfConnections","message":"' . $numberOfConnections .'"}');
}

// when a client closes or lost connection
function wsOnClose($clientID, $status) {
	global $Server, $numberOfConnections;
	$ip = long2ip( $Server->wsClients[$clientID][6] );
	$numberOfConnections--;

	$Server->log( "$ip ($clientID) has disconnected." );

	//Send a user left notice to everyone in the room
	foreach ( $Server->wsClients as $id => $client )
		$Server->wsSend($id, '{"type":"disconnection","message":"' . $numberOfConnections .'"}');
}

function wsStart() {
	// start the server
	$Server = new PHPWebSocket();
	$Server->bind('message', 'wsOnMessage');
	$Server->bind('open', 'wsOnOpen');
	$Server->bind('close', 'wsOnClose');
	// for other computers to connect, you will probably need to change this to your LAN IP or external IP,
	// alternatively use: gethostbyaddr(gethostbyname($_SERVER['SERVER_NAME']))
	$Server->wsStartServer('128.30.53.32', 9300);
}

function wsStop() {
	global $Server;
	$Server->wsStopServer();
}

function wsGetNumberOfConnections() {
	global $numberOfConnections;
	return $numberOfConnections;
}

?>