How to remove quotes in php response?

Question

PHP

Hello. Here is a request

$row = json_encode(array_pop($stmt->fetchAll(PDO::FETCH_OBJ)));
echo "$row";

returns me this answer: {"1":"1500","2":"1000","3":"2000" .... }
How do I change the query so that the answer is like this: {"1": 1500,"2":1000,"3":2000 .... } ?
That is, the numbers 1500,1000 and 2000 did not have quotes, but 1, 2 and 3 did.
The db looks like this:

Answer 1

And actually why?? You get a json encoded string... Where do you need it then??
In general, of course, you can do this: echo json_encode(......., JSON_NUMERIC_CHECK);but something seems to me that you are going to the wrong steppe.

Answer 2

Perhaps your columns are not INT, but VARCHAR or TEXT. Make them INT in the db.