Всем привет! Делаю свой второй проект на MVC, ранее пользовался обычными запросами к базе данных, но решил освоить PDO. Пытаюсь реализовать поиск(сортировку) по сайту Сделал запрос PDO для сортировки по значению которое приходит с $_POST . Запрос не работает. Подскажите пожалуйста где я допустил ошибку?

    public static function getSearchAll()
    {
        // Соединение с БД
        $db = DB::getConnection();
        $options['last_name'] = $_POST['last_name'];
        $options['first_name'] = $_POST['first_name'];
        $options['phone'] = $_POST['phone'];
        $options['department_id'] = $_POST['department_id'];
        $options['country_id'] = $_POST['country_id'];
        $options['city_id'] = $_POST['city_id'];
        $options['education_id'] = $_POST['education_id'];
        $options['man_wuman_id'] = $_POST['man_wuman_id'];
        $options['position_id'] = $_POST['position_id'];
        $options['family_id'] = $_POST['family_id'];
        $options['smok_id'] = $_POST['smok_id'];
        $options['cabinet_id'] = $_POST['cabinet_id'];

        // Текст запроса к БД
        $sql = "SELECT * FROM person
            JOIN department AS d ON p.department_id = d.id
            JOIN position AS po ON p.position_id = po.id
            WHERE
                (:last_name = NULL OR last_name = :last_name) AND
                (:first_name = NULL OR first_name = :first_name) AND
                (:phone = NULL OR phone = :phone) AND
                (:department_id = 0 OR department_id = :department_id) AND
                (:country_id = 0 OR country_id = :country_id) AND
                (:city_id = 0 OR city_id = :city_id) AND
                (:education_id = 0 OR education_id = :education_id) AND
                (:man_wuman_id = 0 OR man_wuman_id = :man_wuman_id) AND
                (:position_id = 0 OR position_id = :position_id) AND
                (:family_id = 0 OR family_id = :family_id) AND
                (:smok_id = 0 OR smok_id = :smok_id) AND
                (:cabinet_id = 0 OR cabinet_id = :cabinet_id)

            ";

        // Получение и возврат результатов. Используется подготовленный запрос
        $result = $db->prepare($sql);
        $result->execute([':last_name' => $options['last_name'],
                        ':first_name' => $options['first_name'],
                        ':phone' => $options['phone'],
                        ':department_id' => $options['department_id'],
                        ':country_id' => $options['country_id'],
                        ':city_id' => $options['city_id'],
                        ':education_id' => $options['education_id'],
                        ':man_wuman_id' => $options['man_wuman_id'],
                        ':position_id' => $options['position_id'],
                        ':family_id' => $options['family_id'],
                        ':smok_id' => $options['smok_id'],
                        ':cabinet_id' => $options['cabinet_id']]);

        return $result->fetchAll(\PDO::FETCH_OBJ);
    }