常见问题 - 作为ws/wss客户端

有时候需要让workerman作为客户端以ws/wss协议去连接某个服务端，并与之交互。
以下是示例。

1、workerman作为ws客户端

<?php
use WorkermanWorker;
use WorkermanConnectionAsyncTcpConnection;
require_once __DIR__ . '/../Workerman/Autoloader.php';
$worker = new Worker();
$worker->onWorkerStart = function($worker){
    $con = new AsyncTcpConnection('ws://echo.websocket.org:80');
    $con->onConnect = function($con) {
        $con->send('hello');
    };
    $con->onMessage = function($con, $data) {
        echo $data;
    };
    $con->connect();
};
Worker::runAll();

2、workerman作为wss(ws+ssl)客户端

<?php
use WorkermanWorker;
use WorkermanConnectionAsyncTcpConnection;
require_once __DIR__ . '/../Workerman/Autoloader.php';
$worker = new Worker();
$worker->onWorkerStart = function($worker){
    // ssl需要访问443端口
    $con = new AsyncTcpConnection('ws://echo.websocket.org:443');
    // 设置以ssl加密方式访问，使之成为wss
    $con->transport = 'ssl';
    $con->onConnect = function($con) {
        $con->send('hello');
    };
    $con->onMessage = function($con, $data) {
        echo $data;
    };
    $con->connect();
};
Worker::runAll();

3、workerman作为wss(ws+ssl)客户端（需要本地ssl证书）

<?php
use WorkermanWorker;
use WorkermanConnectionAsyncTcpConnection;
require_once __DIR__ . '/../Workerman/Autoloader.php';
$worker = new Worker();
$worker->onWorkerStart = function($worker){
    // 设置访问对方主机的本地ip及端口以及ssl证书
    $context_option = array(
        // ssl选项，参考http://php.net/manual/zh/context.ssl.php
        'ssl' => array(
            // 本地证书路径。 必须是 PEM 格式，并且包含本地的证书及私钥。
            'local_cert'        => '/your/path/to/pemfile',
            // local_cert 文件的密码。
            'passphrase'        => 'your_pem_passphrase',
            // 是否允许自签名证书。
            'allow_self_signed' => true,
            // 是否需要验证 SSL 证书。
            'verify_peer'       => false
        )
    );
    // ssl需要访问443端口
    $con = new AsyncTcpConnection('ws://echo.websocket.org:443', $context_option);
    // 设置以ssl加密方式访问，使之成为wss
    $con->transport = 'ssl';
    $con->onConnect = function($con) {
        $con->send('hello');
    };
    $con->onMessage = function($con, $data) {
        echo $data;
    };
    $con->connect();
};
Worker::runAll();