How to block IPs

[topvip]

need to block one or more IPs from visiting your pages?
surfing the web, I was able to find this hint:

$addr = array("1.2.3.4", "1.2.3.5", "1.2.3.6"); // array of IPs..
foreach($addr AS $key=>$value)
if (strstr($_SERVER['REMOTE_ADDR'], $value))
{
Header("Location:www.google.com");
}

you can insert this code just before the line starting with
error_reporting(0)
in the /index.php file.

I used it to block a static IP of a person I didn't want, and it works!
others could find it useful to permanently block spammers, ex-girlfriends, and so on