What is the purpose of the PHP superglobal variable $_SERVER?

The PHP superglobal variable $_SERVER is an array that contains information about the server and the current request environment. It can be used to get information about the server’s environment, such as the domain name, IP address, and the path to the current script.

Example:

// Get the server name
$server_name = $_SERVER[‘SERVER_NAME’];

// Get the current page URL
$current_page_url = “http://” . $_SERVER[‘HTTP_HOST’] . $_SERVER[‘REQUEST_URI’];

// Get the current page path
$current_page_path = $_SERVER[‘DOCUMENT_ROOT’] . $_SERVER[‘SCRIPT_NAME’];