Since deleting page types is a destructive action that is irreversible, it's a good idea to create a dummy page type with the handle of delete_me for this exercise. We will also continue using site_post.php to execute arbitrary code.

The steps for deleting a page type are as follows:

The delete() function deletes the page type, the Master Collection, and all of the pages that use it. Use this function very cautiously, as once the data has been deleted, it cannot be recovered (unless you have a backup copy of the site's database).