Get Geo-IP Information

geolocation_ip.php

<?php

if (!empty($_SERVER['HTTP_CLIENT_IP'])) {
    $ip = $_SERVER['HTTP_CLIENT_IP'];
} elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
    $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
} else {
    $ip = $_SERVER['REMOTE_ADDR'];
}

print_r(geoCheckIP($ip));

//Array ( [domain] => dslb-094-219-040-096.pools.arcor-ip.net [country] => DE - Germany [state] => Hessen [town] => Erzhausen )
//Get an array with geoip-infodata

function geoCheckIP($ip)
{
    //check, if the provided ip is valid
    if (!filter_var($ip, FILTER_VALIDATE_IP)) {
        throw new InvalidArgumentException("IP is not valid");
    }
    
    //contact ip-server
    $response = @file_get_contents('http://www.netip.de/search?query=' . $ip);
    if (empty($response)) {
        throw new InvalidArgumentException("Error contacting Geo-IP-Server");
    }
    
    //Array containing all regex-patterns necessary to extract ip-geoinfo from page
    $patterns            = array();
    $patterns["domain"]  = '#Name: (.*?)&nbsp;#i';
    $patterns["country"] = '#Country: (.*?)&nbsp;#i';
    $patterns["state"]   = '#State/Region: (.*?)<br#i';
    $patterns["town"]    = '#City: (.*?)<br#i';
    
    //Array where results will be stored
    $ipInfo = array();
    
    //check response from ipserver for above patterns
    foreach ($patterns as $key => $pattern) {
        //store the result in array
        $ipInfo[$key] = preg_match($pattern, $response, $value) && !empty($value[1]) ? $value[1] : 'not found';
    }
    return $ipInfo;
}