There are a few important things to remember when trying to geta good google ranking, first of all its good to have other sites linking to your website and secondly its good to have completely valid html and css for your website, which you can check with the below link.
http://validator.w3.org/...
There doesn't appear to be anything wrong with that code, the only problem may be that the unlink() function may not be enabled for security reasons.
I would write it like this.
<?php
for($i=1; $i<=10; i++)
{
unlink($i.".php");
}
?>
It means that you don't have to visit the forums every two weeks to keep your account from being deleted. It lasts for an entire year from the data of purchase as Corey already said.