public FormState::unsetValue($key)
Removes a specific key from the submitted form values.
string|array $key: Values are stored as a multi-dimensional associative array. If $key is a string, it will use unset($values[$key]). If $key is an array, each element of the array will be used as a nested key. If $key = array('foo', 'bar') it will use unset($values['foo']['bar']).
$this
Overrides FormStateInterface::unsetValue
public function unsetValue($key) { NestedArray::unsetValue($this->getValues(), (array) $key); return $this; }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Form!FormState.php/function/FormState::unsetValue/8.1.x