doti3/bar/src/ip_wan.php

#!/usr/bin/php
<?php

require __DIR__.'/base/block.php';

$ipv6 = !empty($argv[1]);
$iface = 'wan';

$command = sprintf(
    'wget -O - -q %s "https://api.ipify.org/?format=text" | head -n 1 | cut -c1-50',
    $ipv6 ? '-6' : null
);

$ip = trim(shell_exec($command));

if (empty($ip)) {
    die;
}

$fullText = sprintf('[%s] %s', $iface, $ip);
$shortText = sprintf('%s: %s', $iface, $ip);

echo block(
    'ip_wan',
    [
        'full_text' => $fullText,
        'short_text' => $shortText,
    ]
);