How to include an absolute link to a file?

Question

PHP

It is included in this way, but it must be an absolute link. It is necessary to include URL_INCLUDE there something like that. How to do it?

<? 
include 'modules/menu.php';
?>

Or how to tell the include to take from the root folder?

Answer 1

$_SERVER['DOCUMENT_ROOT'] . 'modules/menu.php';