Code to rotate affiliate link in script?

I have a script that I want to add some code to randomly add a charities affiliate id say 20% of the time randomly. 80% of the time a another affiliate id.

How can this be done?

Any help would be appreciated.

Thanks

 

<?php
$affiliate_id = 0;
srand(time());
$random = rand() % 10;
if($random <= 2)
  $affilliate_id = charity;
else
  $affiliate_id = other_affiliate_id;
?>

Code (markup):

That would proably work

 

Thanks for the reply.

I am not a programmer, but I will not study the config file and the function files of this script and see what I can figure out.

Thanks again

 

is there a way to do this in htaccess.

But instead of knowing the affiliate id of the users, hows about using some type of wild card to replace for example a clickbank id or amazom id?

If this can be done via htaccess and done on a random basis that might work better.


Any help much appreciated.