Error in BotManager.php line 65 unexpected '?'

[Django1982]

Hi there,

i'm trying to user ure php telegram bot and i got this error code in my apache log file:

[Thu Feb 08 13:39:39.778757 2018] [:error] [pid 31072] [client 149.154.167.229:42151] PHP Parse error: syntax error, unexpected '?' in /vendor/php-telegram-bot/telegram-bot-manager/src/BotManager.php on line 65

I am using this PHP 7.0.27-0+deb9u1

This is the function what my apache/php is curious about (marked it with double **):

public function __construct(array $params)
{
    // Initialise logging before anything else, to allow errors to be logged.
    **$this->initLogging($params['logging'] ?? []);**

    $this->params = new Params($params);
    $this->action = new Action($this->params->getScriptParam('a'));

    // Set up a new Telegram instance.
    $this->telegram = new Telegram(
        $this->params->getBotParam('api_key'),
        $this->params->getBotParam('bot_username')
    );
}

What can i do to avoid this error?

Thanks for your help in advance!

[Django1982]

Wrong Project -> moved to Telegram-Bot-Manager Project and closed here....