title: How to call function in the same class in controller Codeginiter 4
body: <p>in CI3 i can use $this-&gt;function_name() but Does not work on CI4. is there a solution?</p>
  <pre><code>public function a()
  {
    
  }
  public function b()
  {
    $this-&gt;a(); //work on CI3, Does not work on CI4
  }
  </code></pre>
  <p>I really appreciate the answers friends.</p>