WordPress at a glance
function is not described

_prime_term_caches() WP 4.6.0

Adds any terms from the given IDs to the cache that do not already exist in cache.

  • Global. wpdb. $wpdb WordPress database abstraction object.

No Hooks.

Return

Nothing (null).

Usage

_prime_term_caches( $term_ids, $update_meta_cache );
$term_ids(array) (required)
Array of term IDs.
$update_meta_cache(true/false)
Whether to update the meta cache.
Default: true

Code of prime term caches: wp-includes/taxonomy.php VER 5.1.1

<?php
function _prime_term_caches( $term_ids, $update_meta_cache = true ) {
	global $wpdb;

	$non_cached_ids = _get_non_cached_ids( $term_ids, 'terms' );
	if ( ! empty( $non_cached_ids ) ) {
		$fresh_terms = $wpdb->get_results( sprintf( "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 IN (%s)", join( ',', array_map( 'intval', $non_cached_ids ) ) ) );

		update_term_cache( $fresh_terms, $update_meta_cache );

		if ( $update_meta_cache ) {
			update_termmeta_cache( $non_cached_ids );
		}
	}
}