What potential issue could arise if the index.php file is not in the same directory as the logout.php file?

If the index.php file is not in the same directory as the logout.php file, the logout.php file may not be able to correctly redirect to the index.php file after logging out. This could result in a broken or incorrect redirect, leading to a poor user experience. To solve this issue, you can use the PHP header function to redirect to the correct location of the index.php file.

// In logout.php file
header("Location: /path/to/index.php");
exit();