librenms-librenms/includes/html/pages/device/nfsen.inc.php

<?php

print_optionbar_start();

$link_array = array(
    'page'   => 'device',
    'device' => $device['device_id'],
    'tab'    => 'nfsen',
    );

echo generate_link('General', $link_array, array('nfsen' => 'general'));
echo '|';
echo generate_link('Stats', $link_array, array('nfsen' => 'stats'));

$printedChannel = false;
$nfsen_hostname = nfsen_hostname($device['hostname']);
foreach (\LibreNMS\Config::get('nfsen_rrds') as $nfsenDir) {
    $hostDir = $nfsenDir.'/'.$nfsen_hostname.'/';
    if (is_dir($hostDir)) {
        $nfsenRRDchannelGlob = $hostDir.'*.rrd';
        foreach (glob($nfsenRRDchannelGlob) as $nfsenRRD) {
            $channel = str_replace(array($hostDir, '.rrd'), '', $nfsenRRD);

            if (!$printedChannel) {
                echo '|Channels:';
                $printedChannel = true;
            } else {
                echo ',';
            }

            if ($vars['channel'] == $channel) {
                $channelFilter = $hostDir.$channel.'-filter.txt';
            }

            echo generate_link($channel, $link_array, array('nfsen' => 'channel', 'channel' => $channel));
        }
    }
}

print_optionbar_end();

if (!$vars['nfsen']) {
    $vars['nfsen'] = 'general';
}

if (is_file('includes/html/pages/device/nfsen/'.mres($vars['nfsen']).'.inc.php')) {
    include 'includes/html/pages/device/nfsen/'.mres($vars['nfsen']).'.inc.php';
} else {
    include 'includes/html/pages/device/nfsen/general.inc.php';
}

$pagetitle[] = 'Netflow';