lookup.php

<?php

declare(strict_types=1);

header('Content-type: application/json');

if (is_file(__DIR__ . "/vendor/autoload.php")) {
    // Dependencies installed via composer
    require(__DIR__ . "/vendor/autoload.php");
} elseif (is_file('/usr/share/php/GeoIP2/autoload.php')) {
    // Dependencies installed via Fedora autoloader
    require('/usr/share/php/GeoIP2/autoload.php');
} else {
    http_response_code(501);
    exit;
}

use GeoIp2\Database\Reader as GeoIP2;

$Return = [];

$GeoIP2 = new GeoIP2('/usr/share/GeoIP/GeoLite2-Country.mmdb');

if (isset($_POST['ip']) && is_array($_POST['ip'])) {
    foreach ($_POST['ip'] as $IP) {
        try {
            $Return[] = ['ip' => $IP, 'info' => ['country' => strtolower($GeoIP2->country($IP)->country->isoCode), 'host' => $IP]];
        } catch (Exception $e) {
            $Return[] = ['ip' => $IP, 'info' => ['country' => 'un', 'host' => $IP]];
        }
    }
}

echo json_encode($Return);