predefined.php

$_SERVER['PHP_SELF'] = /infost440/a3/predefined.php

$_SERVER['HTTP_USER_AGENT'] = Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)

What they mean

$_SERVER['PHP_SELF'] shows the current file path.

$_SERVER['HTTP_USER_AGENT'] shows browser/device info.

Explanation

Predefined variables are built-in variables that PHP gives you automatically. They are useful information such as server details, the current page, browser information, form data, and other things. They are actually called superglobals because you can use them anywhere you would want to in your code without needing to put them into a function.

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