Question

Alert: This function’s access is marked private. This means it is not intended for use by plugin or theme developers, only in other core functions. It is listed here for completeness.

_get_term_hierarchy( string $taxonomy )

Retrieves children of taxonomy as Term IDs.

---

description

---

参数

$taxonomy

(string) (Required) Taxonomy Name

---

返回值

(array) Empty if $taxonomy isn't hierarchical or returns children as Term IDs.

---

源代码

File: wp-includes/taxonomy.php

		 *
		 * @param string $termlink Category link URL.
		 * @param int    $term_id  Term ID.
		 */
		$termlink = apply_filters( 'category_link', $termlink, $term->term_id );
	}

	/**
	 * Filters the term link.
	 *
	 * @since 2.5.0
	 *
	 * @param string $termlink Term link URL.
	 * @param object $term     Term object.
	 * @param string $taxonomy Taxonomy slug.
	 */
	return apply_filters( 'term_link', $termlink, $term, $taxonomy );

---

更新日志

Version	description
2.3.0	Introduced.

---

User Contributed Notes

1. Skip to note content You must log in to vote on the helpfulness of this noteVote results for this note: 0You must log in to vote on the helpfulness of this note Contributed by Codex

      /** The taxonomy we want to parse */
      $taxonomy = "category";
      /** Get all taxonomy terms */
      $terms = get_terms($taxonomy, array(
              "orderby"    => "count",
              "hide_empty" => false
          )
      );
      /** Get terms that have children */
      $hierarchy = _get_term_hierarchy($taxonomy);
          /** Loop through every term */
          foreach($terms as $term) {
          //Skip term if it has children
          if($term->parent) {
            continue;
          }
            echo $term->name;
          /** If the term has children... */
            if($hierarchy[$term->term_id]) {
          /** display them */
          foreach($hierarchy[$term->term_id] as $child) {
          /** Get the term object by its ID */
          $child = get_term($child, "category_list");
               echo ''.$child->name;
              }
           }
        }