列出所有产品变体？这是如何实现的？求解答

Question

public function get_unviewed_notify() {    set_time_limit(0);    $this->load->add_package_path(APPPATH.'third_party/wish/');    $this->load->library('noti_fetch_unviewed');    $this->load->model('wish_api_model');    $account_row = $this->wish_api_model->fetch_account_info_by_account(137);    if($account_row == NULL) {    echo "Account $account not found\n";    return;    }    $key = $account_row->token;    $account_id = $account_row->id;    if($key == NULL) {    echo "Account $account not found\n";    return;    }    $response = $this->noti_fetch_unviewed    ->set_key($key)    ->set_start(0)    ->set_limit(50)    ->call();    echo '<pre>';    var_dump($response);    }}