Check if a category is an ancestor of another category.
Gets the object of the adjacent (next or previous) post.
Get an array of ancestor IDs for a given object.
Retrieve category parents with separator.
Retrieves the next post that is adjacent to the current post. Return post object.
Retrieve ancestors of a post.
Retrieves the previous post that is adjacent to the current post. Return post as object.
Merge all term children into a single array of their IDs.