<?php

class RecursiveFilterTest {

  public function traverse(array $variables): array {

    $array_iterator = new \RecursiveArrayIterator($variables);
    $filter_iterator = new \RecursiveCallbackFilterIterator($array_iterator, [
      $this, 'isCyclic',
    ]);
    $recursive_iterator = new \RecursiveIteratorIterator($filter_iterator, \RecursiveIteratorIterator::SELF_FIRST);
    $recursive_iterator->setMaxDepth(20);
    foreach ($recursive_iterator as $value) {
    
      // Does stuff here...

      // Avoid recursion by marking where we've been.
      if (\is_object($value)) {
        $value->{'#override_mode_breadcrumb'} = TRUE;
      }
      if (\is_array($value)) {
        $value['#override_mode_breadcrumb'] = TRUE;
      }
    }
    return \iterator_to_array($recursive_iterator);
  }

  public function isCyclic($current, string $key, \RecursiveArrayIterator $iterator): bool {
    // Skip closures.
    if ($current instanceof \Closure) {
      return FALSE;
    }

    ########### Debugging code ################
    static $i = 0;
    $i++;
    if (is_array($current)) {
      // When $i > 319 calling isset causes the process to hang and you have to restart the webserver to get out of it.
      $this_fails = isset($current['#override_mode_breadcrumb']);
    }
    ###########################################

    // Avoid infinite loops by checking if we've been here before.
    // e.g. View > query > view > query ...
    if (\is_array($current) && isset($current['#override_mode_breadcrumb'])) {
      return FALSE;
    }
    if (\is_object($current) && isset($current->{'#override_mode_breadcrumb'})) {
      return FALSE;
    }
    return TRUE;
  }

}

$classes_removed_variables = unserialize('a:17:{s:7:"element";a:45:{s:5:"#type";s:6:"select";s:8:"#options";a:1:{s:16:"Other workspaces";a:3:{s:36:"eb57d455-4dba-4f29-a356-1ef8d75f976f";s:17:"Foundation Models";s:36:"7d3bd93b-f1c5-439a-a60b-fce9fddcf516";s:9:"John Test";s:5:"stage";s:5:"Stage";}}s:14:"#default_value";s:0:"";s:11:"#attributes";a:5:{s:8:"onchange";s:19:"this.form.submit();";s:20:"data-drupal-selector";s:17:"edit-workspace-id";s:5:"class";a:1:{i:0;s:11:"form-select";}s:2:"id";s:17:"edit-workspace-id";s:4:"name";s:12:"workspace_id";}s:19:"#wrapper_attributes";a:1:{s:5:"class";a:1:{i:0;s:16:"container-inline";}}s:6:"#input";b:1;s:9:"#multiple";b:0;s:13:"#sort_options";b:0;s:11:"#sort_start";i:0;s:8:"#process";a:4:{i:0;a:2:{i:0;s:33:"Drupal\\Core\\Render\\Element\\Select";i:1;s:13:"processSelect";}i:1;a:2:{i:0;s:33:"Drupal\\Core\\Render\\Element\\Select";i:1;s:15:"processAjaxForm";}i:2;a:2:{i:0;s:45:"Drupal\\inline_form_errors\\RenderElementHelper";i:1;s:14:"processElement";}i:3;a:2:{i:0;s:38:"Drupal\\bootstrap\\Plugin\\ProcessManager";i:1;s:7:"process";}}s:11:"#pre_render";a:2:{i:0;a:2:{i:0;s:33:"Drupal\\Core\\Render\\Element\\Select";i:1;s:15:"preRenderSelect";}i:1;a:2:{i:0;s:40:"Drupal\\bootstrap\\Plugin\\PrerenderManager";i:1;s:9:"preRender";}}s:6:"#theme";s:6:"select";s:15:"#theme_wrappers";a:1:{i:0;s:12:"form_element";}s:15:"#value_callback";a:2:{i:0;s:33:"Drupal\\Core\\Render\\Element\\Select";i:1;s:13:"valueCallback";}s:8:"#context";a:0:{}s:5:"#icon";N;s:14:"#icon_position";s:6:"before";s:10:"#icon_only";b:0;s:16:"#defaults_loaded";b:1;s:5:"#tree";b:0;s:8:"#parents";a:1:{i:0;s:12:"workspace_id";}s:14:"#array_parents";a:1:{i:0;s:12:"workspace_id";}s:7:"#weight";i:0;s:10:"#processed";b:1;s:9:"#required";b:0;s:14:"#title_display";s:6:"before";s:20:"#description_display";s:5:"after";s:7:"#errors";N;s:3:"#id";s:17:"edit-workspace-id";s:5:"#name";s:12:"workspace_id";s:6:"#value";s:0:"";s:15:"#ajax_processed";b:0;s:5:"#ajax";N;s:24:"#autocomplete_route_name";N;s:12:"#input_group";N;s:19:"#input_group_button";N;s:7:"#sorted";b:1;s:18:"#smart_description";b:0;s:6:"#cache";a:2:{s:4:"tags";a:0:{}s:7:"max-age";i:-1;}s:9:"#attached";a:0:{}s:9:"#children";s:0:"";s:16:"#render_children";b:1;s:10:"#has_error";b:0;s:13:"#field_prefix";N;s:13:"#field_suffix";N;}s:19:"theme_hook_original";s:6:"select";s:12:"title_prefix";a:0:{}s:12:"title_suffix";a:0:{}s:12:"db_is_active";b:1;s:8:"is_admin";b:1;s:9:"logged_in";b:1;s:9:"directory";s:49:"profiles/tacos/your_sites_profile/themes/my_theme";s:7:"options";a:2:{i:0;a:3:{s:8:"selected";b:1;s:4:"type";s:6:"option";s:5:"value";s:0:"";}i:1;a:3:{s:4:"type";s:8:"optgroup";s:5:"label";s:16:"Other 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$test_class = new RecursiveFilterTest();
$test_class->traverse($classes_removed_variables);
echo "Completed.\n";