Выборка из базы данных

private function select($table_name, $fields, $where = "", $order = "", $up = true, $limit = "") {
        for ($i = 0; $i < count($fields); $i++) {
            if ((strpos($fields[$i], "(") === false) && ($fields[$i] != "*")) $fields[$i] = "`".$fields[$i]."`";
        }   
        $fields = implode(",", $fields);
        $table_name = $this->config->db_prefix.$table_name;
        if (!$order) $order = "ORDER BY `id`";
        
        else {
            if ($order != "RAND()") {
                $order = "ORDER BY `$order`";
                if (!$up) $order .= " DESC";
            }
            else $order = "ORDER BY $order";
        }
        if ($limit) $limit = "LIMIT $limit";
        if ($where) $query = "SELECT $fields FROM $table_name WHERE $where $order $limit";
        else $query = "SELECT $fields FROM $table_name $order $limit";
        $result_set = $this->query($query);
        if (!$result_set) return false;
        $i = 0;
        while ($row = $result_set->fetch_assoc()) {
            $data[$i] = $row;
            $i++;
        }
        $result_set->close();
        return $data;
    }

private function select($table_name, $where = "", $order = "", $up = true, $limit = "") {
 
        $table_name = $this->config->db_prefix.$table_name;
        if (!$order) $order = "ORDER BY `id`";
        
        else {
            if ($order != "RAND()") {
                $order = "ORDER BY `$order`";
                if (!$up) $order .= " DESC";
            }
            else $order = "ORDER BY $order";
        }
        if ($limit) $limit = "LIMIT $limit";
        if ($where) $query = "SELECT * FROM $table_name WHERE $where $order $limit";
        else $query = "SELECT * FROM $table_name $order $limit";
        $result_set = $this->query($query);
        if (!$result_set) return false;
        $i = 0;
        while ($row = $result_set->fetch_assoc()) {
            $data[$i] = $row;
            $i++;
        }
        $result_set->close();
        return $data;
    }