What are some common uses for the $_SERVER["DOCUMENT_ROOT"] variable in PHP?

The $_SERVER["DOCUMENT_ROOT"] variable in PHP is commonly used to get the document root directory of the current script. This is useful for including files or resources in a PHP script without worrying about the file path. It can also be used to determine the base directory for storing or accessing files. 

// Get the document root directory
$document_root = $_SERVER["DOCUMENT_ROOT"];

// Include a file using the document root
include $document_root . "/includes/header.php";

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$_SERVER DOCUMENT_ROOT variable PHP common uses

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