php - Passing ID from json to controller with codeigniter CURL

Hello i new on codeigniter, and i have problem when i develop my first website

I have an API, here my url API example

API SHOW ALL ARTICLES

http://localhost/vectorkey/oneportalbackend/api/articles
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API DETAIL ARTICLES

http://localhost/vectorkey/oneportalbackend/api/articles?id_news=13
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that API is show articles data with id_news is equal 13

I want show the detail articles with that API , and fill the parameter id_news dynamically when i click button in my website.

here my button code:

 <a href="<?= base_url().'admin/Articles/detail/'.$row->id_news ?>">
              <button type="button" data-toggle="tooltip" title="Detail"><i ></i></button>
              </a>
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i tried many times,but i don't know to passing id_news to the controller, here my controller code :

public function detail()
{
    $data['master'] = json_decode($this->curl->simple_get('http://localhost/vectorkey/oneportalbackend/api/articles')); 
    $data['datanews'] = json_decode($this->curl->simple_get('http://localhost/vectorkey/oneportalbackend/api/articles?id_news='.$data['master']['id_news']));

    $this->load->view('admin/articles_detail',$data);
}
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i got an error

A PHP Error was encountered

Severity: Notice

Message: Undefined index: id_news

Filename: admin/Articles.php

Line Number: 106

Backtrace:

File: D:\RIFQI_FILE\xampp\htdocs\vectorkey\oneportal\application\controllers\admin\Articles.php
Line: 106
Function: _error_handler

File: D:\RIFQI_FILE\xampp\htdocs\vectorkey\oneportal\index.php
Line: 304
Function: require_once
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