如何使用php websocket创建简单聊天室

var socket = new WebSocket('ws://localhost:8080');     
    // 打开Socket     
    socket.onopen = function(event) {     
    }    
    // 发送一个初始化消息    
     socket.send('I am the client and I\'m listening!');     
    // 监听消息    
     socket.onmessage = function(event) {     
        console.log('Client received a message',event);     
      };  //phpfensi.com    
    // 监听Socket的关闭    
      socket.onclose = function(event) {     
        console.log('Client notified socket has closed',event);     
      };     
      // 关闭Socket....     
    socket.close()     
   socket.onerror = function(evt){console.log(“WebSocketError!”);};

public function start_server(){
  $this->socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
  //允许使用本地地址
  socket_set_option($this->socket, SOL_SOCKET, SO_REUSEADDR, TRUE);
  socket_bind($this->socket, $this->host, $this->port);
  //最多10个人连接，超过的客户端连接会返回WSAECONNREFUSED错误
  socket_listen($this->socket, $this->maxuser);
  while(TRUE) {
    $this->cycle = $this->accept;
    $this->cycle[] = $this->socket;
    //阻塞用，有新连接时才会结束
    socket_select($this->cycle, $write, $except, null);
    foreach ($this->cycle as $k => $v) {
      if($v === $this->socket) {
        if (($accept = socket_accept($v)) < 0) {
          continue;
        }
        //如果请求来自监听端口那个套接字，则创建一个新的套接字用于通信
        $this->add_accept($accept);
        continue;
      }
      $index = array_search($v, $this->accept);
      if ($index === NULL) {
        continue;
      }
      //没消息的socket就跳过
      if (!@socket_recv($v, $data, 1024, 0) || !$data) {
        $this->close($v);
        continue;
      }
      if (!$this->isHand[$index]) {
        $this->upgrade($v, $data, $index);
        if(!empty($this->function['add'])) {
          call_user_func_array($this->function['add'], array($this));
        }
        continue;
      }
      $data = $this->decode($data);
      if(!empty($this->function['send'])) {
        call_user_func_array($this->function['send'], array($data, $index, $this));
      }
    }
    sleep(1);
  }
}
//增加一个初次连接的用户
public function add_accept($accept){
  $this->accept[] = $accept;
  $index = array_keys($this->accept);
  $index = end($index);
  $this->isHand[$index] = FALSE;
}
//关闭一个连接
public function close($accept) {
  $index = array_search($accept, $this->accept);
  socket_close($accept);
  unset($this->accept[$index]);
  unset($this->isHand[$index]);
  if(!empty($this->function['close'])) {
    call_user_func_array($this->function['close'], array($this));
  }
}
//响应升级协议
public function upgrade($accept, $data, $index) {
  if (preg_match("/Sec-WebSocket-Key: (.*)\r\n/",$data,$match)) {
    $key = base64_encode(sha1($match[1] . '258EAFA5-E914-47DA-95CA-C5AB0DC85B11', true));
    $upgrade  = "HTTP/1.1 101 Switching Protocol\r\n" .
      "Upgrade: websocket\r\n" .
      "Connection: Upgrade\r\n" .
      "Sec-WebSocket-Accept: " . $key . "\r\n\r\n";  //必须以两个回车结尾
    socket_write($accept, $upgrade, strlen($upgrade));
    $this->isHand[$index] = TRUE;
  }
}