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I have nid of a book page. I need the nid of the parent and nid of all direct and indirect childs.

How to retrieve the parent and child IDs?

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  • Please elaborate it I am not able to understand it properly. Is book node is some kind of node_reference or what? Commented Apr 29, 2013 at 8:06

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This is for Drupal 6 but might also apply to Drupal 7. The hierarchy of a book is created with a menu. When you have the node object in $node you'll get the menu link id of the parent in $node->book['plid']. You can then load the corresonding node with menu_link_load().

As for the children you have to get the menu that represents the hierarchy of your book with menu_tree_all_data($node->book['menu_name']) and then go through that menu to fetch the links you need.

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