How can PHP be used to assign specific user permissions for accessing certain directories on an IIS server?

To assign specific user permissions for accessing certain directories on an IIS server using PHP, you can utilize the `icacls` command in PHP to set the desired permissions. This can be achieved by executing the `icacls` command through the `exec()` function in PHP with the appropriate parameters for the directory path and desired permissions.

<?php
$directory = "C:\\path\\to\\directory";
$permissions = "icacls " . $directory . " /grant:r username:(OI)(CI)F";
exec($permissions);
?>