MaxMind DB Reader PHP API example code https://github.com/maxmind/MaxMind-DB-Reader-php

ip.php

<?php
require_once 'MaxMind-DB-Reader-php/autoload.php';
use MaxMind\Db\Reader;

$ipAddress = $_SERVER['REMOTE_ADDR'];

if (isset ($_POST["ip"]) ) {
  if (filter_var($_POST["ip"], FILTER_VALIDATE_IP)) {
    $ipAddress = $_POST["ip"];
  } else {
    header("HTTP/2 400 Bad Request");
    die();
  }
} elseif (isset ($_GET["ip"]) ) {
  if (filter_var($_GET["ip"], FILTER_VALIDATE_IP)) {
    $ipAddress = $_GET["ip"];
  } else {
    header("HTTP/2 400 Bad Request");
    die();
  }
}

$databaseFile = "GeoLite2-City.mmdb";
$reader = new Reader($databaseFile);
//print_r($reader->get($ipAddress));
$geoinfo = $reader->get($ipAddress);
$reader->close();

$asnFile = "GeoLite2-ASN.mmdb";
$asnreader = new Reader($asnFile);
//print_r($asnreader->get($ipAddress));
$asninfo = $asnreader->get($ipAddress);
$asnreader->close();

$dbipFile = "DBIP-City-Lite.mmdb";
$dbipreader = new Reader($dbipFile);
//print_r($dbipreader->get($ipAddress));
$dbipinfo = $dbipreader->get($ipAddress);
$dbipreader->close();

header('Content-Type: application/json; charset=utf-8');
header('access-control-allow-origin: *');

$city_update=filemtime("GeoLite2-City.mmdb");
$dbip_update=filemtime("DBIP-City-Lite.mmdb");
?>
{
  "ip": "<?php echo $ipAddress;?>",
  "geolite2":{
    "city": "<?php echo $geoinfo['city']['names']['en'] ?? '';?>",
    "subdivisions": "<?php echo $geoinfo['subdivisions'][0]['names']['en'] ?? '';?>",
    "country": "<?php echo $geoinfo['country']['names']['en'] ?? '';?>",
    "continent": "<?php echo $geoinfo['continent']['names']['en'] ?? '';?>",
    "subdivisions_code": "<?php echo $geoinfo['subdivisions'][0]['iso_code'] ?? '';?>",
    "country_code": "<?php echo $geoinfo['country']['iso_code'] ?? '';?>",
    "continent_code": "<?php echo $geoinfo['continent']['code'] ?? '';?>",
    "accuracy_radius": <?php echo $geoinfo['location']['accuracy_radius'] ?? 'null';?>,
    "latitude": "<?php echo $geoinfo['location']['latitude'] ?? '';?>",
    "longitude": "<?php echo $geoinfo['location']['longitude'] ?? '';?>",
    "timezone": "<?php echo $geoinfo['location']['time_zone'] ?? '';?>",
    "asn": <?php echo $asninfo['autonomous_system_number'] ?? 'null';?>,
    "organization": "<?php echo $asninfo['autonomous_system_organization'] ?? '';?>",
    "last_updated": <?php echo $city_update;?>
  },
  "dbip":{
    "city": "<?php echo $dbipinfo['city']['names']['en'] ?? '';?>",
    "subdivisions": "<?php echo $dbipinfo['subdivisions'][0]['names']['en'] ?? '';?>",
    "country": "<?php echo $dbipinfo['country']['names']['en'] ?? '';?>",
    "continent": "<?php echo $dbipinfo['continent']['names']['en'] ?? '';?>",
    "country_code": "<?php echo $dbipinfo['country']['iso_code'] ?? '';?>",
    "continent_code": "<?php echo $dbipinfo['continent']['code'] ?? '';?>",
    "latitude": "<?php echo $dbipinfo['location']['latitude'] ?? '';?>",
    "longitude": "<?php echo $dbipinfo['location']['longitude'] ?? '';?>",
    "last_updated": <?php echo $dbip_update;?>
  }
}