Are You My Mother?

<?php
/*
 * Are You My Mother? by: Matt Keys
 * Function: Pass an array of Prospective Page IDs along with the current Page ID.
 * Return true if the current page is a child of any of the Prospective Page IDs.
 * Optional: Set third parameter to TRUE if you want to check if the current page is a direct match to a Prospective Page ID
 */
function are_you_my_mother(array $prospective_page_ids, $current_page_id, $match_parent = false) {
 
  // If match_parent is true, see if current page is a direct match before trying ancestors
  if($match_parent && in_array($current_page_id, $prospective_page_ids)) {
    return true;
  }
 
  // Get the ancestors of the $current_page_id
  $child_ancestors = get_post_ancestors($current_page_id);
	
  // Check each ancestor against our $prospective_page_ids. Return true if there is a match.
  foreach($child_ancestors as $ancestors)
  {
    if(in_array($ancestors, $prospective_page_ids)) {
      return true;
    } 
  }
 
}

// EXAMPLE USAGE:
 
if(are_you_my_mother(array('1605','1281','8526'), $post->ID, true)) {
    //DO SOMETHING
}

?>