public FormStateInterface::setValue($key, $value)
Sets the submitted form value for a specific key.
string|array $key: Values are stored as a multi-dimensional associative array. If $key is a string, it will use $values[$key] = $value. 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 $values['foo']['bar'] = $value.
mixed $value: The value to set.
$this
public function setValue($key, $value);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Form!FormStateInterface.php/function/FormStateInterface::setValue/8.1.x