I have a site that I run with 2 other people & we each have a google adsense account to help pay for the site. I want to be able to rotate our codes so that each of our ads appear evenly.

I have made a constants.php page & put the three codes as constants like this
Code:
define (USER1, '<script>a bunch of code here</script>');
define (USER2, '<script>a bunch of code here</script>');
define
...