* Taxonomy API: WP_Term class
* Core class used to implement the WP_Term object.
* @property-read object $data Sanitized term data.
public $term_taxonomy_id = 0;
* The term's taxonomy name.
* The term's description.
public $description = '';
* ID of a term's parent term.
* Cached object count for this term.
* Stores the term object's sanitization level.
* Does not correspond to a database field.
* Retrieve WP_Term instance.
* @global wpdb $wpdb WordPress database abstraction object.
* @param int $term_id Term ID.
* @param string $taxonomy Optional. Limit matched terms to those matching `$taxonomy`. Only used for
* disambiguating potentially shared terms.
* @return WP_Term|WP_Error|false Term object, if found. WP_Error if `$term_id` is shared between taxonomies and
* there's insufficient data to distinguish which term is intended.
* False for other failures.
public static function get_instance( $term_id, $taxonomy = null ) {
$term_id = (int) $term_id;
$_term = wp_cache_get( $term_id, 'terms' );
// If there isn't a cached version, hit the database.
if ( ! $_term || ( $taxonomy && $taxonomy !== $_term->taxonomy ) ) {
// Any term found in the cache is not a match, so don't use it.
// Grab all matching terms, in case any are shared between taxonomies.
$terms = $wpdb->get_results( $wpdb->prepare( "SELECT t.*, tt.* FROM $wpdb->terms AS t INNER JOIN $wpdb->term_taxonomy AS tt ON t.term_id = tt.term_id WHERE t.term_id = %d", $term_id ) );
// If a taxonomy was specified, find a match.
foreach ( $terms as $match ) {
if ( $taxonomy === $match->taxonomy ) {
// If only one match was found, it's the one we want.
} elseif ( 1 === count( $terms ) ) {
$_term = reset( $terms );
// Otherwise, the term must be shared between taxonomies.
// If the term is shared only with invalid taxonomies, return the one valid term.
foreach ( $terms as $t ) {
if ( ! taxonomy_exists( $t->taxonomy ) ) {
// Only hit if we've already identified a term in a valid taxonomy.
return new WP_Error( 'ambiguous_term_id', __( 'Term ID is shared between multiple taxonomies' ), $term_id );
// Don't return terms from invalid taxonomies.
if ( ! taxonomy_exists( $_term->taxonomy ) ) {
return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
$_term = sanitize_term( $_term, $_term->taxonomy, 'raw' );
// Don't cache terms that are shared between taxonomies.
if ( 1 === count( $terms ) ) {
wp_cache_add( $term_id, $_term, 'terms' );
$term_obj = new WP_Term( $_term );
$term_obj->filter( $term_obj->filter );
* @param WP_Term|object $term Term object.
public function __construct( $term ) {
foreach ( get_object_vars( $term ) as $key => $value ) {
* Sanitizes term fields, according to the filter type provided.
* @param string $filter Filter context. Accepts 'edit', 'db', 'display', 'attribute', 'js', 'rss', or 'raw'.
public function filter( $filter ) {
sanitize_term( $this, $this->taxonomy, $filter );
* Converts an object to array.
* @return array Object as array.
public function to_array() {
return get_object_vars( $this );
* @param string $key Property to get.
* @return mixed Property value.
public function __get( $key ) {
$columns = array( 'term_id', 'name', 'slug', 'term_group', 'term_taxonomy_id', 'taxonomy', 'description', 'parent', 'count' );
foreach ( $columns as $column ) {
$data->{$column} = isset( $this->{$column} ) ? $this->{$column} : null;
return sanitize_term( $data, $data->taxonomy, 'raw' );
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