/**
 * 當(dāng)客戶(hù)端與Workerman建立連接時(shí)(TCP三次握手完成后)觸發(fā)的回調(diào)函數(shù)。
 * 每個(gè)連接只會(huì)觸發(fā)一次onConnect回調(diào)。
 *
 * @param \Workerman\Connection\TcpConnection $connection
 */
public function onClientConnected($connection)
{
    $v = '99901807';
    try
    {
        $a = preg_match('/^login:(\w{3,20})/i', $v);
        var_dump($a);
    }
    catch (Throwable $e)
    {
        print_r($e);
    }

}

PS：在不啟動(dòng)workerman的時(shí)候，上面跟 preg_match 有關(guān)的代碼是沒(méi)有報(bào)任何問(wèn)題的。

下面是運(yùn)行時(shí)輸出信息截圖：

workerman的日志：
2019-12-20 10:39:38 pid:5515 Workerman[server.php] restart
2019-12-20 10:39:38 pid:5515 Workerman[server.php] is stopping ...
2019-12-20 10:39:38 pid:5515 Workerman[server.php] stop success
2019-12-20 10:39:44 pid:5515 Workerman[server.php] stopping ...
2019-12-20 10:39:46 pid:5515 worker[TCP Server:5517] exit with status 9
2019-12-20 10:39:46 pid:5515 worker[ChannelServer:5516] exit with status 9
2019-12-20 10:39:46 pid:5515 Workerman[server.php] has been stopped
2019-12-20 10:39:50 pid:5520 Workerman[server.php] start in DEBUG mode
2019-12-20 10:40:03 pid:5520 worker[TCP Server:5522] exit with status 11

沒(méi)有任何錯(cuò)誤信息，正因?yàn)槿绱?，才感覺(jué)莫名其妙

PS: 剛剛測(cè)試，在Linux服務(wù)器上運(yùn)行沒(méi)有問(wèn)題，但以上問(wèn)題是在Mac Book Pro的終端里運(yùn)行的，基于Mac OS 10.14.6

Mac OS 的PHP版本：
PHP 7.3.4 (cli) (built: Apr 19 2019 00:20:56) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.3.4, Copyright (c) 1998-2018 Zend Technologies
with Xdebug v2.7.0, Copyright (c) 2002-2019, by Derick Rethans
with Zend OPcache v7.3.4, Copyright (c) 1999-2018, by Zend Technologies

Linux 的 PHP 版本：
PHP 7.2.6 (cli) (built: Mar 12 2019 19:08:59) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies