If you want to make a URL relative from the WordPress root, you can use the following WordPress function.
<?php
$full_url = "https://intelyblog.com/how-to-programmatically-add-a-wordpress-admin-user-using-functions-php/";
$relative_to_wordpress = wp_make_link_relative($full_url);
echo $relative_to_wordpress;
?>Result: /how-to-programmatically-add-a-wordpress-admin-user-using-functions-php/
That’s all! Happy coding!