protected property FormState::$cleanValueKeys
An associative array of form value keys to be removed by cleanValues().
Any values that are temporary but must still be displayed as values in the rendered form should be added to this array using addCleanValueKey(). Initialized with internal Form API values.
This property is uncacheable.
Type: array
File
- core/lib/Drupal/Core/Form/FormState.php, line 230
Class
- FormState
- Stores information about the state of a form.
Namespace
Drupal\Core\FormCode
protected $cleanValueKeys = [ 'form_id', 'form_token', 'form_build_id', 'op', ];
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Form!FormState.php/property/FormState::cleanValueKeys/8.1.x