PHP实现web socket长链接流程详解

<?php //服务端
$socket = stream_socket_server("tcp://0.0.0.0:8000", $errno, $errstr);
if (!$socket) {
  echo "$errstr ($errno)<br />\n";
} else {
  while ($conn = stream_socket_accept($socket)) { //循环 等待链接
    fwrite($conn, 'The local time is ' . date('n/j/Y g:i a') . "\n");//成功链接输出以上内容 大致为：The local time is 3/22/2023 11:13 am
    fclose($conn); //断开连接
  }
  fclose($socket); //断开socket
}
?>
<?php //客户端
$fp = stream_socket_client("tcp://0.0.0.0:8000", $errno, $errstr, 30);
if (!$fp) {
    echo "$errstr ($errno)<br />\n";
} else {
    fwrite($fp, "GET / HTTP/1.0\r\nHost: www.example.com\r\nAccept: */*\r\n\r\n");
    while (!feof($fp)) {
        echo fgets($fp, 1024);
    }
    fclose($fp);
}
?>

// 创建websocket
ws = new WebSocket("ws://"+domain+"/"+port);
// 当socket连接打开时，输入用户名
ws.onopen = function(){}; //自定义 连接建立时处理操作，比如IM系统登陆信息操作
// 当有消息时根据消息类型显示不同信息
ws.onmessage = function(){};// 操作服务端发来的消息 
ws.onclose = function() {
  console.log("连接关闭，定时重连");
  connect();//重新连接
};
ws.onerror = function() {
  console.log("出现错误");
};

$socket = stream_socket_server('tcp://'.$ipServer.':'.$portNumber, $errno, $errstr);
while($conn = @stream_socket_accept($socket,$nbSecondsIdle))
{
            $message= fread($conn, 1024);
            send($conn,$message);
  					//@todo
  					//连接成功，有要保持连接，用来接收客户端发送过来的数据包 这里可以把这个连接$conn 保存在内存当中，通过Select or Swoole 事件去loop
            fputs ($conn, "OK\n");
}
function send($socket,$buffer){
    $Sec_WebSocket_Key = '';
    if (\preg_match("/Sec-WebSocket-Key: *(.*?)\r\n/i", $buffer, $match)) {
        $Sec_WebSocket_Key = $match[1];
    }
    $new_key = \base64_encode(\sha1($Sec_WebSocket_Key . "258EAFA5-E914-47DA-95CA-C5AB0DC85B11", true));
    $handshake_message = "HTTP/1.1 101 Switching Protocols\r\n"
        ."Upgrade: websocket\r\n"
        ."Sec-WebSocket-Version: 13\r\n"
        ."Connection: Upgrade\r\n"
        ."Sec-WebSocket-Accept: " . $new_key . "\r\n";
    $handshake_message .= "\r\n";
    var_dump($handshake_message);//打印握手信息，然后发送给客户端，建立完整连接
    //socket_write($socket,$handshake_message);
    $len = @\fwrite($socket, $handshake_message);
    return 0;
}