**Functions**

Next Page: `next_page_ID($id)`
Previous Page: `previous_page_ID($id)`

`$id`: The ID of the page you're trying to get the next or previous page for.

**Examples**

```php
$next_ID = next_page_ID('41);
$previous_ID = previous_page_ID('41);
$next_url = get_permalink($next_ID);

echo '<a href="' . $next_url . '">Next Page</a>';
```