Strange php issue with sponsor stats ?

[Adult Site Traffic]

Ok. I still build galleries, I can't break the habit, LOL

I don't like the look of a link like:
http:/secure.thissite.com/track/Q2SD5sW5TG7hY7UvX

So I build a nice little php page for the link:
http:/mysite.com/folder/a.php

Now, I think I'm noticing a serious decline in CTR from sites that I KNOW will do 200 - 300 clicks to the sponsor per day off of a gallery.

Do you think that a LOT of surfers machines have a problem with a simple, instant php redirect page?

Here's that code:

<?php
$url[0]='http:/secure.thissite.com/track/Q2SD5sW5TG7hY7UvX';
$url[1]='http:/secure.thissite.com/track/Q2SD5sW5TG7hY7UvX';
srand((double)microtime()*1234567);
$turl=$url[intval(rand(0,1))];
header("location: $turl");
?>

??

Thank you.

.