This is a live demonstration of the $_SERVER vars defined within PHP as documented at php.net
/playground/php_server.php
/playground
CGI/1.1
69.175.2.202
glamanate.com
Apache/2.2.15 (Unix) mod_ssl/2.2.15 OpenSSL/0.9.8e-fips-rhel5 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635
HTTP/1.1
GET
1337577400
/home/***/public_html
text/html,application/xhtml+xml,text/xml;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
ISO-8859-1,utf-8;q=0.7,*;q=0.7
gzip
en-us,en;q=0.5
close
glamanate.com
CCBot/1.0 (+http://www.commoncrawl.org/bot.html)
38.107.179.221
49487
/home/***/public_html/playground/php_server.php
webmaster@glamanate.com
80
/playground/php_server.php
/playground/php_server.php