wordpress query menu all children of top level parent

问题

I'm lost :) I tried many solutions byt I failed. I need to write the code to create menu of all children of current main (top level) parent. Pages structure looks like this:

• Homepage
• Page A
  • Subpage A1
  • Subpage A2
    • Sub-subpage A2-1
    • Sub-subpage A2-2
• Page B
  • Subpage B1
  • Subpage B2
    • Sub-subpage B2-1
    • Sub-subpage B2-2
  • Subpage B3
• Subpage C

So, if I'm on Page A or Subpage A2 or Subpage A2-1 ... i want to list the same elements:

• Subpage A1
• Subpage A2
  • Sub-subpage A2-1
  • Sub-subpage A2-2

All children of current top level parent (Page A), doesn't metter how 'deep' we're. Any help? :)

回答1:

Here is the answer:

<?php
    if ($post->post_parent) {
        $ancestors=get_post_ancestors($post->ID);
        $root=count($ancestors)-1;
        $parent = $ancestors[$root];
    } else {
        $parent = $post->ID;
    }
    echo '<ul>';
    wp_list_pages('orderby=name&depth=4&order=DESC&show_count=0&child_of='.$parent.'&title_li=');
    echo '</ul>';
?>

来源：https://stackoverflow.com/questions/48934893/wordpress-query-menu-all-children-of-top-level-parent