* WordPress Taxonomy Administration API.
* @subpackage Administration
* Check whether a category exists.
* @param int|string $cat_name Category name.
* @param int $parent Optional. ID of parent term.
function category_exists( $cat_name, $parent = null ) {
$id = term_exists( $cat_name, 'category', $parent );
* Get category object for given ID and 'edit' filter context.
function get_category_to_edit( $id ) {
$category = get_term( $id, 'category', OBJECT, 'edit' );
_make_cat_compat( $category );
* Add a new category to the database if it does not already exist.
* @param int|string $cat_name
function wp_create_category( $cat_name, $parent = 0 ) {
$id = category_exists( $cat_name, $parent );
return wp_insert_category(
'category_parent' => $parent,
* Create categories for the given post.
* @param string[] $categories Array of category names to create.
* @param int $post_id Optional. The post ID. Default empty.
* @return int[] Array of IDs of categories assigned to the given post.
function wp_create_categories( $categories, $post_id = '' ) {
foreach ( $categories as $category ) {
$id = category_exists( $category );
$id = wp_create_category( $category );
wp_set_post_categories( $post_id, $cat_ids );
* Updates an existing Category or creates a new Category.
* @since 2.5.0 $wp_error parameter was added.
* @since 3.0.0 The 'taxonomy' argument was added.
* Array of arguments for inserting a new category.
* @type int $cat_ID Category ID. A non-zero value updates an existing category.
* @type string $taxonomy Taxonomy slug. Default 'category'.
* @type string $cat_name Category name. Default empty.
* @type string $category_description Category description. Default empty.
* @type string $category_nicename Category nice (display) name. Default empty.
* @type int|string $category_parent Category parent ID. Default empty.
* @param bool $wp_error Optional. Default false.
* @return int|object The ID number of the new or updated Category on success. Zero or a WP_Error on failure,
* depending on param $wp_error.
function wp_insert_category( $catarr, $wp_error = false ) {
'taxonomy' => 'category',
'category_description' => '',
'category_nicename' => '',
$catarr = wp_parse_args( $catarr, $cat_defaults );
if ( '' === trim( $catarr['cat_name'] ) ) {
return new WP_Error( 'cat_name', __( 'You did not enter a category name.' ) );
$catarr['cat_ID'] = (int) $catarr['cat_ID'];
// Are we updating or creating?
$update = ! empty( $catarr['cat_ID'] );
$name = $catarr['cat_name'];
$description = $catarr['category_description'];
$slug = $catarr['category_nicename'];
$parent = (int) $catarr['category_parent'];
|| ! term_exists( $parent, $catarr['taxonomy'] )
|| ( $catarr['cat_ID'] && term_is_ancestor_of( $catarr['cat_ID'], $parent, $catarr['taxonomy'] ) ) ) {
$args = compact( 'name', 'slug', 'parent', 'description' );
$catarr['cat_ID'] = wp_update_term( $catarr['cat_ID'], $catarr['taxonomy'], $args );
$catarr['cat_ID'] = wp_insert_term( $catarr['cat_name'], $catarr['taxonomy'], $args );
if ( is_wp_error( $catarr['cat_ID'] ) ) {
return $catarr['cat_ID'];
return $catarr['cat_ID']['term_id'];
* Aliases wp_insert_category() with minimal args.
* If you want to update only some fields of an existing category, call this
* function with only the new values set inside $catarr.
* @param array $catarr The 'cat_ID' value is required. All other keys are optional.
* @return int|false The ID number of the new or updated Category on success. Zero or FALSE on failure.
function wp_update_category( $catarr ) {
$cat_ID = (int) $catarr['cat_ID'];
if ( isset( $catarr['category_parent'] ) && ( $cat_ID == $catarr['category_parent'] ) ) {
// First, get all of the original fields.
$category = get_term( $cat_ID, 'category', ARRAY_A );
_make_cat_compat( $category );
// Escape data pulled from DB.
$category = wp_slash( $category );
// Merge old and new fields with new fields overwriting old ones.
$catarr = array_merge( $category, $catarr );
return wp_insert_category( $catarr );
* Check whether a post tag with a given name exists.
* @param int|string $tag_name
function tag_exists( $tag_name ) {
return term_exists( $tag_name, 'post_tag' );
* Add a new tag to the database if it does not already exist.
* @param int|string $tag_name
function wp_create_tag( $tag_name ) {
return wp_create_term( $tag_name, 'post_tag' );
* Get comma-separated list of tags available to edit.
* @param string $taxonomy Optional. The taxonomy for which to retrieve terms. Default 'post_tag'.
* @return string|false|WP_Error
function get_tags_to_edit( $post_id, $taxonomy = 'post_tag' ) {
return get_terms_to_edit( $post_id, $taxonomy );
* Get comma-separated list of terms available to edit for the given post ID.
* @param string $taxonomy Optional. The taxonomy for which to retrieve terms. Default 'post_tag'.
* @return string|false|WP_Error
function get_terms_to_edit( $post_id, $taxonomy = 'post_tag' ) {
$post_id = (int) $post_id;
$terms = get_object_term_cache( $post_id, $taxonomy );
if ( false === $terms ) {
$terms = wp_get_object_terms( $post_id, $taxonomy );
wp_cache_add( $post_id, wp_list_pluck( $terms, 'term_id' ), $taxonomy . '_relationships' );
if ( is_wp_error( $terms ) ) {
foreach ( $terms as $term ) {
$term_names[] = $term->name;
$terms_to_edit = esc_attr( implode( ',', $term_names ) );
* Filters the comma-separated list of terms available to edit.
* @see get_terms_to_edit()
* @param string $terms_to_edit A comma-separated list of term names.
* @param string $taxonomy The taxonomy name for which to retrieve terms.
$terms_to_edit = apply_filters( 'terms_to_edit', $terms_to_edit, $taxonomy );
* Add a new term to the database if it does not already exist.
* @param string $tag_name The term name.
* @param string $taxonomy Optional. The taxonomy within which to create the term. Default 'post_tag'.
function wp_create_term( $tag_name, $taxonomy = 'post_tag' ) {
$id = term_exists( $tag_name, $taxonomy );
return wp_insert_term( $tag_name, $taxonomy );
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