php实现websocket实时消息推送

public function service(){
//获取tcp协议号码。
$tcp = getprotobyname("tcp");
$sock = socket_create(AF_INET,SOCK_STREAM,$tcp);
socket_set_option($sock,SOL_SOCKET,SO_REUSEADDR,1);
if($sock < 0)
{
throw new Exception("failed to create socket: ".socket_strerror($sock)."\n");
}
socket_bind($sock,$this->address,$this->port);
socket_listen($sock,$this->port);
echo "listen on $this->address $this->port ... \n";
$this->_sockets = $sock;
}

public function run(){
$this->service();
$clients[] = $this->_sockets;
while (true){
$changes = $clients;
$write = NULL;
$except = NULL;
socket_select($changes,$write,$except,NULL);
foreach ($changes as $key => $_sock){
if($this->_sockets == $_sock){ //判断是不是新接入的socket
if(($newClient = socket_accept($_sock)) === false){
die('Failed to accept socket: '.socket_strerror($_sock)."\n");
}
$line = trim(socket_read($newClient,1024));
$this->handshaking($newClient,$line);
//获取client ip
socket_getpeername ($newClient,$ip);
$clients[$ip] = $newClient;
echo "Client ip:{$ip} \n";
echo "Client msg:{$line} \n";
} else {
socket_recv($_sock,$buffer,2048,0);
$msg = $this->message($buffer);
//在这里业务代码
echo "{$key} clinet msg:",$msg,"\n";
fwrite(STDOUT,'Please input a argument:');
$response = trim(fgets(STDIN));
$this->send($_sock,$response);
echo "{$key} response to Client:".$response,"\n";
}
}
}
}

/**

• 握手处理
• @param $newClient socket
• @return int 接收到的信息
  */
  public function handshaking($newClient,$line){

$headers = array();
$lines = preg_split("/\r\n/",$line);
foreach($lines as $line)
{
  $line = chop($line);
  if(preg_match('/\A(\S+): (.*)\z/',$line,$matches))
  {
    $headers[$matches[1]] = $matches[2];
  }
}
$secKey = $headers['Sec-WebSocket-Key'];
$secAccept = base64_encode(pack('H*',sha1($secKey . '258EAFA5-E914-47DA-95CA-C5AB0DC85B11')));
$upgrade = "HTTP/1.1 101 Web Socket Protocol Handshake\r\n" .
  "Upgrade: websocket\r\n" .
  "Connection: Upgrade\r\n" .
  "WebSocket-Origin: $this->address\r\n" .
  "WebSocket-Location: ws://$this->address:$this->port/websocket/websocket\r\n".
  "Sec-WebSocket-Accept:$secAccept\r\n\r\n";
return socket_write($newClient,$upgrade,strlen($upgrade));

}

/**

• 解析接收数据
• @param $buffer
• @return null|string
  */
  public function message($buffer){
  $len = $masks = $data = $decoded = null;
  $len = ord($buffer[1]) & 127;
  if ($len === 126) {
  $masks = substr($buffer,4,4);
  $data = substr($buffer,8);
  } else if ($len === 127) {
  $masks = substr($buffer,10,14);
  } else {
  $masks = substr($buffer,2,6);
  }
  for ($index = 0; $index < strlen($data); $index++) {
  $decoded .= $data[$index] ^ $masks[$index % 4];
  }
  return $decoded;
  }

/**

• 发送数据
• @param $newClinet 新接入的socket
• @param $msg 要发送的数据
• @return int|string
  */
  public function send($newClinet,$msg){
  $msg = $this->frame($msg);
  socket_write($newClinet,strlen($msg));
  }

public function frame($s) {
$a = str_split($s,125);
if (count($a) == 1) {
return "\x81" . chr(strlen($a[0])) . $a[0];
}
$ns = "";
foreach ($a as $o) {
$ns .= "\x81" . chr(strlen($o)) . $o;
}
return $ns;
}

/**

• 关闭socket
  */
  public function close(){
  return socket_close($this->_sockets);
  }
  }

$sock = new SocketService();
$sock->run();