blizz_vanisher-8.x-1.x-dev/blizz_vanisher.install

<?php

/**
 * Updates the names of the settings variables.
 */
function blizz_vanisher_update_8001() {
  /* @var \Drupal\Core\Config\ConfigFactoryInterface $config_fatory_service */
  $config_fatory_service = \Drupal::service('config.factory');
  /* @var \Drupal\Core\Config\Config $settings */
  $settings = $config_fatory_service->getEditable(\Drupal\blizz_vanisher\Form\SettingsForm::SETTINGS_NAME);
  foreach (
    [
      'hashtag',
      'high_privacy',
      'orientation',
      'adblocker',
      'show_alert_small',
      'cookieslist',
      'remove_credit',
      'default_rejected',
    ] as $variable
  ) {
    $value = $settings->get($variable);
    $settings->set("blizz_vanisher_{$variable}", $value);
    $settings->clear($variable);
  }
  $settings->save();
}