In a WordPress environment, what specific considerations should be taken into account when retrieving the URL of the parent page for form submissions?

When retrieving the URL of the parent page for form submissions in a WordPress environment, it is important to consider the possibility of the form being displayed on a child page or a post. In order to accurately retrieve the URL of the parent page, you can use the `wp_get_post_parent_id()` function to get the ID of the parent page and then use `get_permalink()` to retrieve the URL.

// Get the ID of the parent page
$parent_id = wp_get_post_parent_id(get_the_ID());

// Get the URL of the parent page
$parent_url = get_permalink($parent_id);

// Output the URL of the parent page
echo $parent_url;