swoole定时器发心跳，之前加了异常不能捕获socket断开的异常，终极方案是判断返回值

swoole_timer_tick

Severity: Warning –> swoole_client::send(): object is not instanceof swoole_client.

//30s发一次心跳包
swoole_timer_tick(30 * 1000, function ($timer_id) use ($client) {
    //心跳包内容
    $heartbeat_param = 'ping';
    $heartbeat_bin = pack('C4', 0, 0, 0, strlen($heartbeat_param));  //加4字节宽的包头
    try {
        if (!$client || !($client instanceof swoole_client)) {
            .....
        }
        $send_result = $client->send($heartbeat_param);
        log_message('debug', "send result:" . $send_result);
        //判断返回值
        if(!$send_result) {
            log_message('error', 'client 被服务端断开,退出重新执行' . PHP_EOL);
            $mail_result = MailTool::send('socket报警', 'client 被服务端断开,退出重新执行');
            if ($mail_result) {
                log_message('debug', '发送报警邮件成功');
            } else {
                log_message('error', '发送报警邮件失败');
            }
            exit('client 被服务端断开,退出重新执行');
        }
        log_message('debug', '发送心跳' . PHP_EOL);
    } catch (Exception $e) {
        log_message('error', '发送心跳, error:' . $e->getMessage() . PHP_EOL);
        log_message('error', ' 检测心跳错误,执行关闭 $client->close() ' . PHP_EOL);
        exit(' $client->close() ');
    }

});

参考