get_object_term_cache( int $id, string $taxonomy ): bool|WP_Term[]|WP_Error

Retrieves the cached term objects for the given object ID.


Upstream functions (like get_the_terms() and is_object_in_term() ) are responsible for populating the object-term relationship cache. The current function only fetches relationship data that is already in the cache.


Term object ID, for example a post, comment, or user ID.
Taxonomy name.


bool|WP_Term[]|WP_Error Array of WP_Term objects, if cached.
False if cache is empty for $taxonomy and $id.
WP_Error if get_term() returns an error object for any term.


function get_object_term_cache( $id, $taxonomy ) {
	$_term_ids = wp_cache_get( $id, "{$taxonomy}_relationships" );

	// We leave the priming of relationship caches to upstream functions.
	if ( false === $_term_ids ) {
		return false;

	// Backward compatibility for if a plugin is putting objects into the cache, rather than IDs.
	$term_ids = array();
	foreach ( $_term_ids as $term_id ) {
		if ( is_numeric( $term_id ) ) {
			$term_ids[] = (int) $term_id;
		} elseif ( isset( $term_id->term_id ) ) {
			$term_ids[] = (int) $term_id->term_id;

	// Fill the term objects.
	_prime_term_caches( $term_ids );

	$terms = array();
	foreach ( $term_ids as $term_id ) {
		$term = get_term( $term_id, $taxonomy );
		if ( is_wp_error( $term ) ) {
			return $term;

		$terms[] = $term;

	return $terms;


4.7.0Returns a WP_Error object if there’s an error with any of the matched terms.

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