Relations (of posts terms...) (tag)
| cat_is_ancestor_of() | Checks if the specified category is a child of another specified category (all nesting levels are checked). Conditional tag. |
| get_adjacent_post() | Gets the object of the adjacent (next or previous) post from the specified taxonomy (the default is category). |
| get_ancestors() | Gets the IDs of the parent elements of the specified object (page, taxonomy, category). |
| get_category_parents() | Gets a list of parent categories of the current category. The list is displayed in hierarchical order. |
| get_next_post() | Retrieves the next post (as object) from the specified taxonomy (the default is category). |
| get_post_ancestors() | Gets the IDs of all parent posts for the specified one as an array. |
| get_previous_post() | Retrieves the previous post (as object) from the specified taxonomy (the default is category). |
| get_term_children() | Gets all child elements of the specified taxonomy element (categories) as an array. |