Show Only Children Pages on Parent Page

I’ve been searching the web for hours today trying to find a method to keep my menu structure from scrolling all the way down the page. I’ve looked at various WordPress functions to do the job such as get_page_children(), wp_list_pages() and wp_page_menu() but there doesn’t seem to be a simple function that will list just the current menu hierarchy. But then, just in time, I found the function remove_others_children() written by Jonathan Dingman (http://www.firesidemedia.net/) with assistance from Matt Martz (http://sivel.net/).

The code is as follows, and yes I did copy this code from Jonathan’s website (with his permission) and yes he is in the process of modifying the code so if you want the updates just pop over to his website at http://www.firesidemedia.net/.

To use the code, just add the code to your theme’s functions.php file. This will automatically remove all but the current children pages from your menu structure. The page menu on this website is an example of the codes usage.

 

 add_filter('wp_list_pages_excludes',  'remove_others_children');
 function remove_others_children($excludes =  array()) {
  $all_pages = get_pages();
   $all_children = (array) get_page_children(true, $all_pages);
   foreach ( $all_children as $child )
    $excludes[] = $child->ID;
   if(!is_page())
    return $excludes;

  global $post;

  $this_heirarchy = (array) $post->ancestors;
  $this_children = (array) get_page_children($post->ID, $all_pages);
  foreach($this_heirarchy as $ancestor)
    $this_children = array_merge($this_children, (array)  get_page_children($ancestor, $all_pages));

  foreach($this_children as $child)
    $this_heirarchy[] = $child->ID;

  return array_diff($excludes, $this_heirarchy);
}