VALIDATION

سلام وقت بخیر ببخشید من اومدم برای update ولیدیت کردن بعد میخام بدونم ک درست انجام دادم (اصولیه)

    public function is_valid_city($city_id, $city_name)
    {
        global $pdo;
        if (!is_null($city_id) and !empty($city_name) and is_numeric($city_id)) {
            $sql = "SELECT * from city where id = :id";
            $stmt = $pdo->prepare($sql);
            $stmt->execute([':id' => $city_id ?? '']);
            $record = $stmt->fetch(PDO::FETCH_OBJ);
            return $record ? true : false;
        }
    }
----------------------------------------------------
    case 'PUT':
        [$city_id, $city_name] = [$request_body['city_id'] ?? '', $request_body['name'] ?? ''];
        if (!$validator->is_valid_city($city_id, $city_name))
            Respones::respondAndDie("Invalid City Data", Respones::HTTP_NOT_ACCEPTABLE);
        $respones = $city_service->updateCity($city_id, $city_name);
        Respones::respondAndDie($respones, Respones::HTTP_OK);

public function is_valid_city($city_id, $city_name) { global $pdo; if (is_null($city_id) || !is_numeric($city_id) || empty($city_name)) { return false; } $sql = "SELECT * from city where id = :id"; $stmt = $pdo->prepare($sql); $stmt->execute([':id' => $city_id]); $record = $stmt->fetch(PDO::FETCH_OBJ); return $record ? true : false; }