I had this old piece of code from CSS Tricks that was for making it so I could conditionally target child pages of a parent. It worked great until I changed my content to a custom post type. Now the code no longer works, as it was specifically for pages.

    function is_tree($pid) { // $pid = The ID of the page we're looking for pages underneath
        global $post; // load details about this page
          return true; // we're at the page or at a sub page
          return false; // we're elsewhere

I adapted it, now using is_singular('post_type'). The problem is that it always seems to meet the first condition and never hits the second elseif. I can't seem to figure out why exactly it isn't working.

    function is_tree($pid) {  
        global $post; 
        if(is_singular('guides' )&&($post->post_parent==$pid||is_singular( 'guides', $pid ))) 
          return true;   
          return false;  

Any idea on what might be going wrong here?

1 Answer 1


is_singular only accepts one argument- post type. It's only for checking if a post is of a certain type(s), not a specific post of that type. Check $post->ID instead-

if(is_singular('guides' )&&($post->post_parent==$pid||$post->ID==$pid))

I would also consider using get_queried_object() and/or get_queried_object_id() rather than use the global $post.

  • Perfect, that seems to have worked. Now for the get_queried_object, how do use that in this context? I tried just replacing global get_queried_object_id() and got an error and none of the documentation I've read seems to match this context(sorry not a developer here).
    – jbwharris
    Feb 5, 2018 at 13:35

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