List Parent And Child Pages

List Parent And Child Pages

<?php
  if($post->post_parent)
  $children = wp_list_pages("title_li=&child_of=".$post->post_parent."&echo=0");
  else
  $children = wp_list_pages("title_li=&child_of=".$post->ID."&echo=0");
  if ($children) { ?>
    <ul class="sectionlist">
      <?php
		$parent_title = get_the_title($post->post_parent);?>
		<li class="page_item <?php
			global $post;     // if outside the loop
			if ( is_page() && $post->post_parent ) {
    			// This is a subpage
			} else {
    			echo 'current_page_item';// This is not a subpage
			}
		?>"><a href="<?php echo get_permalink($post->post_parent) ?>"><?php echo $parent_title;?></a></li>
  		<?php echo $children; ?>
      </ul>
  <?php } ?>