Include php files when they\'re in different folders (directories)

Now, Assuming that we want to call file(1-5).php in index.php which is in DirectoryB, we can use the following approach:

Contents of index.php:

<?php
include($_SERVER['DOCUMENT_ROOT'].'/../DirectoryA/file1.php');
include($_SERVER['DOCUMENT_ROOT'].'/../DirectoryA/file2.php');
include($_SERVER['DOCUMENT_ROOT'].'/../DirectoryA/file3.php');
include($_SERVER['DOCUMENT_ROOT'].'/../DirectoryA/file4.php');
include($_SERVER['DOCUMENT_ROOT'].'/../DirectoryA/file5.php');
?>

In the above example, $_SERVER gets the DOCUMENT_ROOT asset in the configuration for the given site and then performs actions relative to it, i.e.: /../ takes to the parent folder and then we add the relative path to file.