{

public static function isInsideRadius($addressString, $IPaddress, $distanceInKm = 100)

{

if (!$addressString || !$IPaddress || $distanceInKm <= 0) {

return null;

}

$record = geoip_record_by_name($IPaddress);

if ($record) {

if (!empty($record['latitude']) && !empty($record['longitude'])) {

try {

$addressString = str_replace(' ', '+', $addressString);

$url = 'https://maps.googleapis.com/maps/api/geocode/json?address=' . $addressString . '&key=' . GOOGLE_API_KEY;

$get_content = file_get_contents($url);

$coordination = json_decode($get_content, true);

if ($coordination['status'] != 'OK') {

return null;

}

$LatLng = array();

foreach ($coordination['results'] as $coord) {

$LatLng = array(

'latitude' => $coord['geometry']['location']['lat'],

'longitude' => $coord['geometry']['location']['lng']

);

}

if (empty($LatLng)) {

return null;

}

$distance = static::distance($record['latitude'], $record['longitude'], $LatLng['latitude'], $LatLng['longitude'], false);

return $distance < $distanceInKm;

} catch (Exception $e) {

return null;

}

}

}

return null;

}

private static function distance($lat1, $lng1, $lat2, $lng2, $miles = true)

{

$pi80 = M_PI / 180;

$lat1 *= $pi80;

$lng1 *= $pi80;

$lat2 *= $pi80;

$lng2 *= $pi80;

$r = 6372.797; // mean radius of Earth in km

$dlat = $lat2 - $lat1;

$dlng = $lng2 - $lng1;

$a = sin($dlat / 2) * sin($dlat / 2) + cos($lat1) * cos($lat2) * sin($dlng / 2) * sin($dlng / 2);

$c = 2 * atan2(sqrt($a), sqrt(1 - $a));

$km = $r * $c;

return ($miles ? ($km * 0.621371192) : $km);

}