$_SERVER PHP super global variable, associative array containing information such as headers, paths, and script locations, provided only by HTTP server:

$_SERVER PHP super global variable, associative array containing information such as headers, paths, and script locations, provided only by HTTP server:
* https://www.php.net/manual/en/reserved.variables.server.php
* https://www.w3schools.com/Php/php_superglobals_server.asp