php - 如何使用 WebSocket 从 PHP 发送数据/文本进行处理？

Question

我在服务器上有进程充当 WebSocket 服务器(不是用 Ratchet 编写的)。我希望能够使用 PHP(作为客户端)将数据发送到此进程。

我发现了很多像这样作为 TCP 发送的示例:

<?php
  $addr = gethostbyname("localhost");

  $client = stream_socket_client("tcp://$addr:8887", $errno, $errorMessage);

  if ($client === false) {
      throw new UnexpectedValueException("Failed to connect: $errorMessage");
  }

  fwrite($client, "GET / HTTP/1.0\r\nHost: localhost\r\nAccept: */*\r\n\r\n");
  echo stream_get_contents($client);
?>

我只需要向进程发送消息并关闭连接。我期望的结果是来自 webSocket 的结果稍后将被打印或“回显”到 PHP 页面。

有没有办法让它在 php 中与 curl 一起工作？

Answer 1

我在 github 上找到了这段代码，(我找不到确切的代码来源，因为我已经查看并尝试了很多)

<?php
class WebsocketClient {

    private $_Socket = null;

    public function __construct($host, $port) {
        $this->_connect($host, $port);
    }

    public function __destruct() {
        $this->_disconnect();
    }

    public function sendData($data) {
        // send actual data:
        fwrite($this->_Socket, "\x00" . $data . "\xff") or die('Error:' . $errno . ':' . $errstr);
        $wsData = fread($this->_Socket, 2000);
        $retData = trim($wsData, "\x00\xff");
        return $retData;
    }

    private function _connect($host, $port) {
        $key1 = $this->_generateRandomString(32);
        $key2 = $this->_generateRandomString(32);
        $key3 = $this->_generateRandomString(8, false, true);

        $header = "GET /echo HTTP/1.1\r\n";
        $header.= "Upgrade: WebSocket\r\n";
        $header.= "Connection: Upgrade\r\n";
        $header.= "Host: " . $host . ":" . $port . "\r\n";
        $header.= "Origin: http://localhost\r\n";
        $header.= "Sec-WebSocket-Key1: " . $key1 . "\r\n";
        $header.= "Sec-WebSocket-Key2: " . $key2 . "\r\n";
        $header.= "\r\n";
        $header.= $key3;


        $this->_Socket = fsockopen($host, $port, $errno, $errstr, 2);
        fwrite($this->_Socket, $header) or die('Error: ' . $errno . ':' . $errstr);
        $response = fread($this->_Socket, 2000);

        /**
         * @todo: check response here. Currently not implemented cause "2 key handshake" is already deprecated.
         * See: http://en.wikipedia.org/wiki/WebSocket#WebSocket_Protocol_Handshake
         */
        return true;
    }

    private function _disconnect() {
        fclose($this->_Socket);
    }

    private function _generateRandomString($length = 10, $addSpaces = true, $addNumbers = true) {
        $characters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!"§$%&/()=[]{}';
        $useChars = array();
        // select some random chars:    
        for ($i = 0; $i < $length; $i++) {
            $useChars[] = $characters[mt_rand(0, strlen($characters) - 1)];
        }
        // add spaces and numbers:
        if ($addSpaces === true) {
            array_push($useChars, ' ', ' ', ' ', ' ', ' ', ' ');
        }
        if ($addNumbers === true) {
            array_push($useChars, rand(0, 9), rand(0, 9), rand(0, 9));
        }
        shuffle($useChars);
        $randomString = trim(implode('', $useChars));
        $randomString = substr($randomString, 0, $length);
        return $randomString;
    }

}

$WebSocketClient = new WebsocketClient('localhost', 8887);
echo $WebSocketClient->sendData("MyUserNameFromPHP");
unset($WebSocketClient);
?>

在我尝试过的 7 个 php websocket 客户端中，这是我唯一能够使用的客户端。 它不需要任何外部文件或框架。 这是执行不需要持久连接到 webSocket 服务器的短命令的简单实现。

我希望它能帮助到你们，你们会节省一些时间!!!