Pressbooks\Catalog::getBookIds PHP Метод

    function getBookIds()
    {
        /** @var $wpdb \wpdb */
        global $wpdb;
        $sql = $wpdb->prepare("SELECT blogs_id FROM {$this->dbTable} WHERE users_id = %d AND deleted = 0 ", $this->userId);
        return $wpdb->get_col($sql);
    }