An associative array of information stored by Form API that is necessary to build and rebuild the form from cache when the original context may no longer be available:

public FormState::getButtons() Returns the

public FormState::setErrorByName($name, $message = '')

public FormState::setRedirect($route_name, array $route_parameters = array(), array

Stores which errors should be limited during validation. An array of "sections" within which user input must be valid. If the element is within

Used when a form needs to return some kind of a \Symfony\Component\HttpFoundation\Response object, e.g., a \Symfony\Component\HttpFoundation\BinaryFileResponse when triggering

public FormState::isSubmitted() Determines

public FormState::getError(array $element) Returns

public &FormState::getTriggeringElement() Gets

If TRUE, programmatic form submissions are processed without taking #access into account. Set this to FALSE when submitting a form programmatically with values that may have