_prime_post_parent_id_caches

WordPress Version: 6.4

/**
 * Prime the cache containing the parent ID of various post objects.
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @since 6.4.0
 *
 * @param int[] $ids ID list.
 */
function _prime_post_parent_id_caches(array $ids)
{
    global $wpdb;
    $ids = array_filter($ids, '_validate_cache_id');
    $ids = array_unique(array_map('intval', $ids), SORT_NUMERIC);
    if (empty($ids)) {
        return;
    }
    $cache_keys = array();
    foreach ($ids as $id) {
        $cache_keys[$id] = 'post_parent:' . (string) $id;
    }
    $cached_data = wp_cache_get_multiple(array_values($cache_keys), 'posts');
    $non_cached_ids = array();
    foreach ($cache_keys as $id => $cache_key) {
        if (false === $cached_data[$cache_key]) {
            $non_cached_ids[] = $id;
        }
    }
    if (!empty($non_cached_ids)) {
        $fresh_posts = $wpdb->get_results(sprintf("SELECT {$wpdb->posts}.ID, {$wpdb->posts}.post_parent FROM {$wpdb->posts} WHERE ID IN (%s)", implode(',', $non_cached_ids)));
        if ($fresh_posts) {
            $post_parent_data = array();
            foreach ($fresh_posts as $fresh_post) {
                $post_parent_data['post_parent:' . (string) $fresh_post->ID] = (int) $fresh_post->post_parent;
            }
            wp_cache_add_multiple($post_parent_data, 'posts');
        }
    }
}