PHPWEBSOCKET

So here is a quick hack to implement websockets in php.
As of Feb/10 the only browsers that support websockets are Google Chrome and Safari nightlies

Changelog

• 2010.02.18 - Chatbot demo extending websocket class
• 2010.02.18 - Websocket class for better reuse
• 2010.02.15 - Added Users list to keep track of handshakes
• 2010.02.15 - 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 of client.html

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 of server.php

Steps to run the test:

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

WebSockets for the masses!

Author

George Nava

http://georgenava.appspot.com
http://mylittlehacks.appspot.com
http://twitter.com/georgenava