[wp] 현재 페이지에서 네비게이션 부모 쿼리 가져오기

functions.php

<?php

/**
 * 현재 페이지에서 네비게이션 부모 쿼리 가져오기 함수
 *
 * @author       Hansanghyeon
 * @copyright    Hansanghyeon <999@hyeon.pro>
 **/

function my_menu_parent($theme_location)
{
  global $post;
  $locations = get_nav_menu_locations();
  if (isset($locations[$theme_location])) {
    $menu = wp_get_nav_menu_object($locations[$theme_location]);
    $menu_items = wp_get_nav_menu_items($menu->term_id);
    _wp_menu_item_classes_by_context($menu_items);
    $breadcrumbs = array();

    foreach ($menu_items as $menu_item) {
      if ($menu_item->current_item_ancestor) {
        $breadcrumbs[] = $menu_item->title;
        break;
      }
    }
    if (empty($breadcrumbs) && !empty($post)) {
      foreach ($menu_items as $menu_item) {
        if ($menu_item->object === $post->post_type) {
          $breadcrumbs[] = get_the_title($menu_item->menu_item_parent);
          break;
        }
      }
    }

    return $breadcrumbs;
  }
}