PHP and WebSockets

Quick hack to implement websockets in php. As of Feb/10 the only browsers that support websockets are Google Chrome and Webkit Nightlies. Get it from here http://www.google.com/chrome

Browse the source code

Changelog

• 010.02.16 - Added basic demo and chatbot
• 010.02.16 - Added users list to keep track of handshakes
• 010.02.16 - Organized everything in a reusable websocket class
• 010.02.16 - Minor cosmetic changes

Client side

var host = "ws://localhost:12345/websocket/server.php";
try{
  socket = new WebSocket(host);
  log('WebSocket - status '+socket.readyState);
  socket.onopen    = function(msg){ log("Welcome - status "+this.readyState); };
  socket.onmessage = function(msg){ log("Received: "+msg.data); };
  socket.onclose   = function(msg){ log("Disconnected - status "+this.readyState); };
}
catch(ex){ log(ex); }

View source code for the client

Server side

log("Handshaking...");
list($resource,$host,$origin) = getheaders($buffer);
$upgrade = "HTTP/1.1 101 Web Socket Protocol Handshake\r\n" .
           "Upgrade: WebSocket\r\n" .
           "Connection: Upgrade\r\n" .
           "WebSocket-Origin: " . $origin . "\r\n" .
           "WebSocket-Location: ws://" . $host . $resource . "\r\n" .
           "\r\n";
$handshake = true;
socket_write($socket,$upgrade.chr(0),strlen($upgrade.chr(0)));

View source code for the server

Steps to run the test:

1. Save both files, client.php and server.php, in a folder in your local server running Apache and PHP.
2. From the command line, run the server.php program to listen for socket connections.
3. Open Google Chrome (dev build) and point to the client.php page
4. Done, your browser now has a full-duplex channel with the server.
5. Start sending commands to the server to get some responses.

2010 will be an interesting year.

WebSockets for the masses!