Question

I’ve created a recursive function to find out if current page is a child of page in a page tree.

My function:

function is_ancestor_of( $page_name = null, $post ) {

  if(is_null($page_name))
    return false;

  // does it have a parent?
  if (!isset( $post->post_parent ) OR $post->post_parent <= 0 )
    return false;

  //Get parent page
  $parent = wp_get_single_post($post->post_parent);

  if ( $parent->post_name == $page_name ){
    echo $parent->post_name.' - '.$page_name;
    return true;
  } else {
    is_ancestor_of( $page_name, $parent );
  }
}

This is the code I’m testing with:

$is_parent = is_ancestor_of( 'account', $post );

if(!$is_parent) {
  echo '<br/> No match';
}

And this is the result:

account – account
No match

This shows that it does find a parent page names ‘account’, but it is not returning any data. I’ve also tested returning a string, but that is not working either.

Can anyone see what I’m doing wrong?

Answer 1

Your problem seems that you’re calling your function recursively but not returning the result from your recursive call.

Your line

is_ancestor_of( $page_name, $parent );

should probably just be

return is_ancestor_of( $page_name, $parent );