ISPC 3.1 b1 letsencrypt cron split function

Please change function from split() to explode() in 900-letsencrypt.inc.php

class cronjob_letsencrypt extends cronjob {

    // job schedule
    protected $_schedule = '0 3 * * *';

    public function onRunJob() {
            global $app, $conf;

            $letsencrypt = array_shift( explode("\n", `which letsencrypt /root/.local/share/letsencrypt/bin/letsencrypt`) );
            if(is_executable($letsencrypt)) {
                    exec($letsencrypt . ' -n renew');
                    $app->services->restartServiceDelayed('httpd', 'reload');
            }

            parent::onRunJob();
    }

}