but why add rel=”nofollow” to hundreds of links when you can add a single line to robots.txt to disallow /casino.php or /casino/
Also, with only a few links that may be ok but every request to every page on your server, apache has to parse every line and check for a match against the url. This can easily crash your http server with a moderate amount of traffic or at least slow it down enough to make users want to click the back button.
I am not saying what your doing is wrong. I am just suggesting more efficient ways to do it.