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Questions about hierarchical taxonomies

  • Hello, I couldn’t search out the information anywhere else, need somebody shade lights…
    1. Should I register both parent and child as “hierarchical => true”, if there’s no grandchild?
    2. How to register child taxonomies?
    If “Movie” is the top level taxonomy, when I register a child,
    Is it as simply as :'parent_item' => __( 'Parent Movie' ) ?
    3. How to automatically asign a child taxonomy to a post?
    So far, I figured out how to asign a taxonomy to a post, but, does this work fine with child taxonomy?
    wp_set_object_terms($post_ID, $cat, 'category');


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