Authorize a domain for wordpress theme

In Server:

$domain = $_GET['domain'];                                //Get domain
$Array = array('127.0.0.1','localhost','www.ikxin.com','www.keepmins.com');  //Authorized domain list
echo in_array($domain, $Array) ? 'true' : 'false';              //return the resule

In Client:

$shouname = trim($_SERVER['SERVER_NAME']);  //get domain
$shouurl = file_get_contents('http://119.27.180.212/auth.php?domain='.$shouname);  //get authorized domain form server
if($shouurl=='true'){
    echo "authorized";    //Authorized
}else{
    die("unauthorized");    //Unauthorized
}