Originally Posted by psili

I suck at this, but:
<?php
// on page being hit
if(isset($_COOKIE["alreadyhere"]))
{
header("Location: /another/uri");
}
else
{
setcookie( "alreadyhere", 1, (time()*100000), $_SERVER["REQUEST_URI"] );
}
?>

-- or some shit. basically, store something of the URI they already visited, test and send somewhere else.

someone else has a more elegant solution that's bug-checked, so I'll just bump this for ya