fixing perl scripts for register_globals = Off

[Ron Farrer <rbf@farrer.net>]

Hello,

I'm new to PHP and I have several PHP pages that were working fine until
the admins changed register_globals = On to register_globals = Off. Now
all of my PHP pages are broken. I looked through all of my PHP reference
books and did a google search, but I couldn't find anything helpful. So
I thought I'd ask here. Below is an example PHP page that is broken, can
someone show me how to fix? That way I can see the changes in something 
I somewhat understand.

---cut-here---
<? $agent_info = $HTTP_USER_AGENT . "\t" . $REMOTE_ADDR . "\t" . date("M
d, Y
H:i:s") . "\n";
$fp = fopen("/home/rbf/public_html/output.txt", "a");
fwrite($fp,$agent_info);
fclose($fp);
?>
---cut-here---

This is just a simple bit of PHP that logs the users web browser and ip
address.

TIA!
Ron