Help me stop DDoS

Can you help me write a script that hits the limit
time for 3.x rotorcms. I want some smaller hits
500. If you exceed the 500 will notice the entrance: the site is overloaded, please visit a few minutes

    function server_busy($numer){
    if (PHP_OS == ‘Linux’ AND @file_exists(‘/proc/loadavg’) AND $filestuff =@file_get_contents(‘/proc/loadavg’)){
    $loadavg = explode(‘ ’, $filestuff);
    if (trim($loadavg[0]) > $numer) {
    print ‘the site is overloaded, please visit a few minutes….’;
    exit(0);
    }
    }
    } 

    $srv = server_busy(500);
?>

I'm using 3.3.2 Rotorcms
code above does not work, please help me edit it,

Give the reference to a site

Nicht fershctein

500 - is a very very lot.
$srv = server_busy('5.00');
if load average > 5 (5.00) or 10, it is time to take action...
when load average is 500 server will not work ;-)

4. shilo,
I do not understand what you say

$srv = server_busy('5.00');

^ That's done, 500 is a lot.
Кто на инглише свободно говорит, объясните ему что 500 это очень очень много, сервер с такой нагрузкой со свистом вылетает из стойки

asked to explain...
$srv = server_busy(500); // is a server with 500 processor cores, you really have such a server?

otherwise do not run on a server with four cores, because max "loadavg" for him <= 8

7. Trionix,
Thanks! but it does not work

shilo (7 Мая 2013 / 10:54)
$srv = server_busy('5.00');

^ That's done, 500 is a lot.
Кто на инглише свободно говорит, объясните ему что 500 это очень очень много, сервер с такой нагрузкой со свистом вылетает из стойки

Не ему, а ей.

Please help me