Yes I Know Most Of You Have This But There Are A Fare Few Who Don't So Here Is The Script To Stop Multi Sign Up's On Your Game =]
First Off Open Register.php And Find This
$q=$db->query("SELECT * FROM users WHERE lastip='$IP' AND userid={$_POST['ref']}");
And add undernetah it
$a=mysql_query("SELECT * FROM users WHERE lastip='$ip'",$c);
Then Find
if(mysql_num_rows($a) > 0)
Add undernetah it
{
die("No multi's! Your not trying to make another account are you! Sorry! Not Allowed!");
}
And it should work :P Enjoy