swoole的webSocket类没有connections属性吗？出错了

Notice: Undefined property: swoole_websocket_server::$connections in /www/server.php on line 34

<?php

// 官网demo
$ws = new swoole_websocket_server("************", 9502);



function broadcast(swoole_websocket_server $ws, $msg, $me = null) {
    foreach($ws->connections as $fd) {
        if($fd != $me) {
            $ws->push($fd, $msg);
        }
    }
}

// 监听WebSocket连接打开事件
$ws->on('open', function (swoole_websocket_server $ws, $request) {
    $ws->push($request->fd, "欢迎接入小孟聊天平台\n");
    broadcast($ws, "用户{$request->fd}登录啦！", $request->fd);
});

// 监听WebSocket消息事件
$ws->on('message', function (swoole_websocket_server $ws, $frame) {
    $msg =  'from'.$frame->fd.":{$frame->data}\n";
    broadcast($ws, $msg);
   // $ws->push($frame->fd, "server: {$frame->data}");
    // $ws->push($frame->fd, "server: {$frame->data}");
});

// 监听WebSocket连接关闭事件
$ws->on('close', function (swoole_websocket_server $ws, $fd) {
    broadcast($ws, "用户{$fd}下线啦！");
});


$ws->start();

这是代码，不是用connections属性吗

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你的系统缺少pcre组件，而connections迭代器需要依赖这个库。

• 安装pcre-dev(ubuntu)或pcre-devel(centos)

• 重新编译安装swoole

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我安装swoole1.8.7-beta的时候也碰到这个问题，后来安装了pcre还是不行，我想应该是顺序错了，应该先安装pcre再安装swoole应该可以