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Get Top Parent or Grandparent ID Wordpress

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From 'Andy' in the comments.

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Copy this code and paste it in your HTML 
  1. function get_top_ancestor($id){
  2. $current = get_post($id);
  3. if(!$current->post_parent){
  4. return $current->ID;
  5. } else {
  6. return get_top_ancestor($current->post_parent);
  7. }
  8. }

URL: http://andyweigel.com/blog/wordpress-how-tos/great-grand-parent-ids-in-wordpress/44

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