使用PHP客户端连接到websocket

这是我一直在使用的代码,已经在不同的论坛上广泛发布.但由于某种原因,我无法让它发挥作用.

任何帮助,将不胜感激.

$host = 'host';  //where is the websocket server
$port = 443; //ssl
$local = "http://www.example.com/";  //url where this script run
$data = '{"id": 2,"command": "server_info"}';  //data to be send

$head =        "GET / HTTP/1.1"."\r\n".
               "Upgrade: WebSocket"."\r\n".
               "Connection: Upgrade"."\r\n".
               "Origin: $local"."\r\n".
               "Host: $host"."\r\n".
               "Content-Length: ".strlen($data)."\r\n"."\r\n";
////WebSocket handshake
$sock = fsockopen($host, $port, $errno, $errstr, 2);
fwrite($sock, $head ) or die('error:'.$errno.':'.$errstr);
$headers = fread($sock, 2000);
fwrite($sock, "\x00$data\xff" ) or die('error:'.$errno.':'.$errstr);
$wsdata = fread($sock, 2000);  //receives the data included in the websocket package "\x00DATA\xff"
$retdata = trim($wsdata,"\x00\xff"); //extracts data
////WebSocket handshake
fclose($sock);

echo $retdata;

我可能更喜欢使用现有的websocket客户端库(可能是 https://github.com/gabrielbull/php-websocket-client或 https://github.com/Devristo/phpws/tree/master/src/Devristo/Phpws/Client？)而不是自己滚动,但我至少通过使用以下方式连接：

$head = "GET / HTTP/1.1"."\r\n".
    "Host: $host"."\r\n".
    "Upgrade: websocket"."\r\n".
    "Connection: Upgrade"."\r\n".
    "Sec-WebSocket-Key: asdasdaas76da7sd6asd6as7d"."\r\n".
    "Sec-WebSocket-Version: 13"."\r\n".
    "Content-Length: ".strlen($data)."\r\n"."\r\n";

我的服务器正在使用TLS / SSL,所以我还需要：

$sock = fsockopen('tls://'.$host, $port, $errno, $errstr, 2);

完整的协议规范是：https://tools.ietf.org/rfc/rfc6455.txt