PHP Get Environment Variables Examples. Description: Displays information about the users computer who is visiting your webpage. IP Address and Web Browser Information, etc. Examples: Instructions: Copy and paste the following code into your webpage where you like it to appear. <?php //Jason J. Russo. More free scripts at //http://thescriptcenter.com/ $IP = getenv("REMOTE_ADDR"); $browser = getenv("HTTP_USER_AGENT"); $refer = getenv("HTTP_REFERER"); echo "You are using $browser<BR>Your IP address is $IP<BR>You Came from: $refer"; ?>