PHP socket server testing code

<?php

require "server.php"; // I called the socket server file this

$clients = array();

function onConnection ($client, $server) {
  global $clients;
  $clients[$client] = false;
  $server -> send($client, "Please enter your name: ");
}

function onClose ($client, $server) {
  global $clients;
  $name = $clients[$client];
  unset($clients[$client]);
  if ($name === false) return; // if it never gave us a name, we don't care
  $server -> broadcast("$name disconnected", 0, SERVER_SEND_LINE_CRLF);
}

function onMessage ($message, $client, $server) {
  global $clients;
  if ($clients[$client] === false) {
    $clients[$client] = $message; // first message is the name
    $server -> broadcast("$message connected", - $client, SERVER_SEND_LINE_CRLF);
    // and we tell everyone else this person connected
    return;
  }
  $name = $clients[$client];
  $server -> broadcast("$name: $message", - $client, SERVER_SEND_LINE_CRLF);
  // we send the message to everyone but the guy who sent it
}

function setupServer () {
  $server = new Server();
  $server -> splitMode = SERVER_SPLIT_NEWLINES_NO_BLANKS; // we split on Enters
  $server -> openCallback = "onConnection";
  $server -> closeCallback = "onClose";
  $server -> receiveCallback = "onMessage";
  return $server;
}

$myServer = setupServer();
$myServer -> open(46464); // choose any port you like

?>