DB\SQL\Mapper::count PHP Метод

    function count($filter = NULL, $ttl = 0)
    {
        $sql = 'SELECT COUNT(*) AS ' . $this->db->quotekey('rows') . ' FROM ' . $this->table;
        $args = [];
        if ($filter) {
            if (is_array($filter)) {
                $args = isset($filter[1]) && is_array($filter[1]) ? $filter[1] : array_slice($filter, 1, NULL, TRUE);
                $args = is_array($args) ? $args : [1 => $args];
                list($filter) = $filter;
            }
            $sql .= ' WHERE ' . $filter;
        }
        $result = $this->db->exec($sql, $args, $ttl);
        return $result[0]['rows'];
    }