connection.on('close', function(connection) {
    if (userName !== false && userColor !== false) {
      console.log((new Date()) + " Peer "
          + connection.remoteAddress + " disconnected.");
		var obj = {
			time: (new Date()).getTime(),
			text: userName + 'has disconnected.',
			author: 's',
			color: 'green'
		};
		var json = JSON.stringify({ type:'disconnect', data: obj });
        for (var i=0; i < clients.length; i++) {
          clients[i].sendUTF(json);
        }

      // remove user from the list of connected clients
      clients.splice(index, 1);
      // push back user's color to be reused by another user
      colors.push(userColor);
    }
  });



index.php:
else if (json.type === 'disconnect') {
		addMessage(json.data.author, json.data.text, new Date(json.data.time));
	}