PHP。 如果字段包含“{}”和“[]”，如何从MySQL结果作为对象和数组获取

I have some db table like this. This table contains strings and numbers, but some fields (type: text) contains [] arrays and {} objects(json) (empty or not).

+------+----------+------+--------+--------+---------+-----------+
| name | lastName | type | delete | rights | records | documents |
+------+----------+------+--------+--------+---------+-----------+
| varch| varchar  | int  |  int   | text   | text    |   text    |
+------+----------+------+--------+--------+---------+-----------+
| An   | Blabla   | 0    |  0     | []     | {"a": 1}|   {12: {}}|
+------+----------+------+--------+--------+---------+-----------+
| Bn   | Blablab  | 5    |  0     |  [2,3] | {}      |   {}      |
+------+----------+------+--------+--------+---------+-----------+

DB request:

$stmt = $this->db->prepare('select ' . USER_TABLE_FIELDS .' from users where
                  name = :name');
        $stmt->execute(array(':name' => $name));
        $result1 = $stmt->fetch(PDO::FETCH_ASSOC);

and in var $result1 I have array this $key (string) and $value(string for all fields).

How can I fetch result for fileds rights as array, records as object, documents as object, not string?

And I know about (object) $var and (array) $var, but probably there is more simple way, becouse it can be multilevel in future.