How to get rid of double quotes in json array?

Question

PHP

There is a record of the $product object and a translation of the $product object into an array:

if (isset($_POST['get_product'])){
    $product_id = $_POST['product_id'];
    global $connection;
    $query = "SELECT * FROM product WHERE id = '$product_id'";
    $res = mysqli_query($connection, $query);
    $product= [];
    while($row = mysqli_fetch_assoc($res)) {
        $product_id = $row['id'];
            $product[$product_id] = [
                'product_id' => $row['id'],
                'product_title' => $row['title'],
                'product_image' => $row['image'],
                'product_text' => $row['text'],
            ];
    }
    echo json_encode(array_values($product));
}

There is an ajax request, where the array is obtained:

let PRODUCTS = [];
function getProducts(){
    $.ajax({
        type: "POST",
        dataType: 'JSON',
        url: "http://sait/api/api_product.php",
        data: "product_id="+product_id+
            "&get_product=yes",

        error: function(){
            swal("Ошибка!","Проверьте Интернет-соединение и повторите попытку","error");
        }
    })
        .then(showProducts)
        .catch(err=>{
            errorMessage(err.message);
        });
}

function showProducts(products){
    PRODUCTS = products;
    console.dir(PRODUCTS);
}

so, I get the following format in the console:
product_id: "2"
product_image: "images/150x150.png"
product_text: "Good product, thank you all"
product_title: "Product 2"
and I need the digital values ​​to be without "":
product_id : 2
How is it done?

Answer 1

echo json_encode($what, JSON_NUMERIC_CHECK);
And, "between us girls", there you have holes:

$product_id = $_POST['product_id'];
$query = "SELECT * FROM product WHERE id = '$product_id'"; // <-- Hi there SQL injection...