What role does the document root variable ($_SERVER["DOCUMENT_ROOT"]) play in PHP file inclusion and how can it be utilized effectively?

When including files in PHP, using the document root variable ($_SERVER["DOCUMENT_ROOT"]) can help ensure that the correct file path is used regardless of the current working directory. This variable provides the full server path to the root directory of the web server, allowing for consistent file inclusion across different pages and directories. 

<?php
// Include a file using the document root variable
include $_SERVER["DOCUMENT_ROOT"] . "/path/to/file.php";
?>

Keywords

$_SERVER["DOCUMENT_ROOT"] PHP file inclusion variable utilization effective

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