Is it possible with PHP to get the ip adress, user agent, browser, etc. from an external computer. If the answer is 'yes', could you also say were I can find these commands (tutorials, articles, etc.)
not sure if you can...check the php manual, can view it @ php.net ... i know perl can do those pretty easily, i don't like perl myself, but if all you are doing it grabbing those variables it could be pretty painless.
run <? phpinfo(); ?>
You'll see a list of all the envirnment variables, and their current values. Then, you can use them in your scripts.
RTFM!
http://www.php.net/manual/en/reserved.variables.php