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WordPress: Get the root page ID

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Get the ID of the root (oldest ancestor, parent without parents) page relative to the current page in a WordPress page template.

Can be helpful for use with wp\_list\_pages() to create navigation markup.

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Copy this code and paste it in your HTML 
  1. <?php $root_page_id = ( empty( $post->ancestors ) ) ? $post->ID : end( $post->ancestors ); ?>

URL: http://codex.wordpress.org/Template_Tags/wp_list_pages#List_subpages_even_if_on_a_subpage

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