Pagination problem

Hi, I'm newbie for codeigniter.

I'm now learning of pagination class, and while trying to practice example in Codeigniter's documentation, I had a problem

Code:

$this->load->library('pagination');

       $config['base_url'] = 'http://example.com/index.php/test/page/';
       $config['total_rows'] = 200;
       $config['per_page'] = 20;

       
       $this->pagination->initialize($config);
       
       echo $this->pagination->create_links();

This is the exactly same example in the documentation, and I think it doesn't work in php 7.1.

I display pagination like "123>Last>" which should have had 10 links(but three links were shown up).

What mistake did I make?