How to remove certain parameter in request getPost

I want to update a data in a model, with parameter from user form request post. How can I filter that only certain field that can be updated by removing some parameters in getPost() ?

Pass all the getPost() data but set the allowed fields in the model. Everything else won’t be updated.

http://codeigniter.com/user_guide/models...your-model

PHP Code:

protected $allowedFields = ['name', 'email']; 


CodeIgniter 4 tutorials (EN/FR) - https://includebeer.com
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If you're attempting to filter out fields that are defined in $allowedFields but you don't want an end user to somehow find out about them and then use them maliciously in a crafted request, you can just iterate over the data returned by getPost in a foreach statement, compare the key, and determine if it's allowed to stay.

PHP Code:

    foreach ($data as $key => $value) {
      if ($key !== 'username') {
        if ($key !== 'password') {
          if ($key !== 'referred_by') {
            unset($data[$key]);
          }
        }
      }
    }