bbp_get_forum_subscribers (intforum_id美元）

函数bbp_get_forum_subscribers($forum_id = 0) {$forum_id = bbp_get_forum_id($forum_id);If(空($forum_id))返回;全球wpdb美元;$key = $wpdb->前缀。“_bbp_forum_subscriptions”;$users = wp_cache_get('bbp_get_forum_subscribers_'。美元forum_id bbpress_users);if (false === $users) {$ users = $wpdb->get_col("SELECT user_id FROM {$wpdb->usermeta} WHERE meta_key = '{$key}' and FIND_IN_SET('{$forum_id}'， meta_value) > 0");wp_cache_set(“bbp_get_forum_subscribers_”。$forum_id， $users， 'bbpress_users'); } return apply_filters( 'bbp_get_forum_subscribers', $users ); }