Get ID of “root-page”

2 comments

1. I think what you need is:

   <?php 
   $post_id = $post->ID; //or somehow get the current post ID.
   $ancestors = get_post_ancestors($post_id)  
   //$ancestors is an array of post IDs starting with the current post going up the root
   //'Pop' the root ancestor out or returns the current ID if the post has no ancestors.
   $root_id = (!empty($ancestors) ? array_pop($ancestors): $post_id);
   

   For more info check: http://codex.wordpress.org/Function_Reference/get_post_ancestors

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2. I think a better solution than @alexleonard ‘s is to use the parent_id parameter of the post object.

   $parent = ( $post_obj->parent_id != 0 ) ? $post_obj->parent_id : false;
   

   Haven’t tested that, so make sure you check for spelling mistakes and such.

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