Predefined Variables in PHP

Example:

You are running the file:
/home/halver86/public_html/440/assignment3/predefined.php.

You are viewing this page using:
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)

This server is running:
Apache.

Predefined variables in PHP have their own value before execution of the PHP code. Most of these predefined variables reflect the properties of the server as a whole, such as the operating system in use.