How to check whether a page is a direct or indirect child page of another page in WordPress?

2 comments

1. You can use get_post_ancestors() like this:

   $parents = get_post_ancestors($post);
    foreach($parents as $page_id){
       if($page_id == ID of specific parent page){
   
       // Do something
   
       break; //Match found, no need to keep checking
       }
    }
   

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2.     $pageId= get_the_ID(); 
       function get_topmost_parent($post_id)
       {
           $parent_id = get_post($post_id)->post_parent;
           if($parent_id == 0)
           {
               return $post_id;
           }
           else
           {
               return get_topmost_parent($parent_id);
           }
       }
   

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