私は働くコードを見つけました、私にとって魅力のように働きます:
/**
* Create HTML list of pages.
*
* @package Razorback
* @subpackage Walker
* @author Michael Fields <michael@mfields.org>
* @copyright Copyright (c) 2010, Michael Fields
* @license http://opensource.org/licenses/gpl-license.php GNU Public License
*
* @uses Walker_Page
*
* @since 2010-05-28
* @alter 2010-10-09
*/
class Razorback_Walker_Page_Selective_Children extends Walker_Page {
/**
* Walk the Page Tree.
*
* @global stdClass WordPress post object.
* @uses Walker_Page::$db_fields
* @uses Walker_Page::display_element()
*
* @since 2010-05-28
* @alter 2010-10-09
*/
function walk( $elements, $max_depth ) {
global $post;
$args = array_slice( func_get_args(), 2 );
$output = '';
/* invalid parameter */
if ( $max_depth < -1 ) {
return $output;
}
/* Nothing to walk */
if ( empty( $elements ) ) {
return $output;
}
/* Set up variables. */
$top_level_elements = array();
$children_elements = array();
$parent_field = $this->db_fields['parent'];
$child_of = ( isset( $args[0]['child_of'] ) ) ? (int) $args[0]['child_of'] : 0;
/* Loop elements */
foreach ( (array) $elements as $e ) {
$parent_id = $e->$parent_field;
if ( isset( $parent_id ) ) {
/* Top level pages. */
if( $child_of === $parent_id ) {
$top_level_elements[] = $e;
}
/* Only display children of the current hierarchy. */
else if (
( isset( $post->ID ) && $parent_id == $post->ID ) ||
( isset( $post->post_parent ) && $parent_id == $post->post_parent ) ||
( isset( $post->ancestors ) && in_array( $parent_id, (array) $post->ancestors ) )
) {
$children_elements[ $e->$parent_field ][] = $e;
}
}
}
/* Define output. */
foreach ( $top_level_elements as $e ) {
$this->display_element( $e, $children_elements, $max_depth, 0, $args, $output );
}
return $output;
}
}