// Recursive search through page hierarchy
if (is_page($page) || (is_array($post->ancestors) && in_array($page, $post->ancestors) )) {

I am having the same problem as a few other commenters posted above – getting the following error message:

Warning: in_array() [function.in-array]: Wrong datatype for second argument in /home/username/example.com/wp-content/themes/theme-name/functions.php on line 120

Line 120 is from your function (the latest version you’ve commented above… though I get the same error with the previous version as well):

Line 120 –> if (is_page($page) || in_array($page, $post->ancestors)) {

I am using the function call in my nav menu, pretty much as you would expect. Any idea what about that “in_array” call is off?

Perhaps the plugin version has been corrected? I’ll try that. Otherwise, I suppose I’ll use the older / original version of this function, is_page_or_sub. But I do hope you can fix the function.php version, as I prefer that method rather than using plugins.

Thanks!

function is_page_or_ancestor($page = ”)
{
  global $post, $wpdb;

  // If is not numeric get page ID
  if (!is_numeric($page)) {
    $page = $wpdb->get_var(“SELECT ID FROM $wpdb->posts WHERE post_name = ‘”.$page.”‘ AND post_type = ‘page’”);
  }

  // Recursive search through page hierarchy
  if (is_page($page) || in_array($page, $post->ancestors)) {
    return true;
  }
  return false;
}

I had the same error as Mike, using the same configuration except WP 2.9.2 and your revised code works perfectly! Hopefully you can update the plugin soon in the WP repository because this is essential code for anyone hard coding their navigation. Thanks for making this, saved my bacon for sure!

Trevor

if (!function_exists(‘is_page_or_ancestor’)) {
  function is_page_or_ancestor($page = ”) {
    global $post, $wpdb;

    // If is not numeric get page ID
    if (!is_numeric($page)) {
      $page = $wpdb->get_var(“SELECT ID FROM $wpdb->posts WHERE post_name = ‘”.$page.”‘ AND post_type = ‘page’”);
    }

    $ancestors = get_post_ancestors($page);

    // Recursive search through page hierarchy
    if (is_page($page) || in_array($page, $ancestors)) {
      return true;
    }
    return false;
  }
}