<?php
if (array_key_exists('HTTP_X_FORWARDED_FOR', $_SERVER)) {
    $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
} else if (array_key_exists('HTTP_CLIENT_IP', $_SERVER)) {
    $ip = $_SERVER['HTTP_CLIENT_IP'];
} else {
    $ip = $_SERVER['REMOTE_ADDR'];
}   

$localIP  = explode('.',$ip);
$intranet = false;
if (in_array($localIP[0],array('127','10','172','192') )) {
    $intranet = true;
}
header("Access-Control-Allow-Origin: *");
header("Content-type: application/json");
$result = array('intranet' => $intranet, 'ip' => $ip);
echo json_encode($result);

?>