Description:
------------
I am running on Windows 10 with MySQL Community Server edition and PHP 7.3.3 using Xampp Apache. I have also rolled back to PHP 7.3.2 and 7.2, without success. When I run the code to update any of the information from my tables, I don't get any error message in the browser (Firefox, Chrome and Explorer) but the database does not update.

Test script:
---------------
function update(){
  $query = "UPDATE
    " . $this->table_name . "
SET
    city = :city,
    provinceid = :provinceid,
    countryid  = :countryid

WHERE
    id = :id";

$stmt = $this->conn->prepare($query);

// posted values
$this->city=htmlspecialchars(strip_tags($this->city));
$this->provinceid=htmlspecialchars(strip_tags($this->provinceid));
$this->countryid=htmlspecialchars(strip_tags($this->countryid));
$this->id=htmlspecialchars(strip_tags($this->id));

// bind parameters
$stmt->bindParam(':city', $this->city);
$stmt->bindParam(':provinceid', $this->provinceid);
$stmt->bindParam(':countryid', $this->country_d);
$stmt->bindParam(':id', $this->id);
    // execute the query

    if($stmt->execute()){
        return true;
    }
     return false;
     
}

Expected result:
----------------
I expect to see that the data in my database has updated with the changes.

Actual result:
--------------
Nothing happens. I just get the message from my code that the database is not updated.