function enable_code(){
global $mac; global $access_code; global $code; global $tel; global $ip;
$host = 'localhost';
$database = 'datausers';
$user = 'root';
$pass = 'toor';
$link = mysqli_connect($host,$user,$pass,$database);
if(!$link)
{
    die("Database connection failed: " . mysqli_error());

}

$db_secelect = mysqli_select_db($link,$database);
if(!$db_secelect)
{
    die("Database connection failed: " .mysqli_error($link));
}
if($access_code == $code)
{
    shell_exec("iptables -t mangle -I internet 1 -m mac --mac-source
    ".$mac." -j RETURN");
    mysqli_query($link,"INSERT INTO dataconnection(phone,ip,mac,enable) VALUE ('$tel'.'$ip','$mac',1)");
    sleep(1); header("location:http://".$_GET['add']); exit;
}