title: How to create and load new helper in CodeIgniter 4
body: <p>i want to create new function in helper, but it still failed : 
  <code>Call to undefined function</code></p>
  
  <p>i save my helper at <code>app/Helper/Text_helper.php</code> using <code>namespace App\Helpers;</code>
  and load helpers on BaseController using <code>protected $helpers = ['text'];</code></p>
  
  <p>Reference : <a href="https://codeigniter4.github.io/userguide/general/helpers.html#extending-helpers" rel="nofollow noreferrer">https://codeigniter4.github.io/userguide/general/helpers.html#extending-helpers</a>
  but it's still not working</p>