public FormState::disableCache() Prevents

public FormState::setRedirectUrl(Url $url) Sets

Tracks if any errors have been set on any form. Type: bool File

An associative array of values submitted to the form. The validation functions and submit functions use this array for nearly all their decision

public FormState::setCached($cache = TRUE) Sets

TRUE signifies correct form submission. This is always TRUE for programmed forms coming from

public FormState::disableRedirect($no_redirect = TRUE)

Stores the gathered submission handlers. This property is uncacheable. Type:

If TRUE, the form was submitted and has been processed and executed. This property is uncacheable. Type:

public FormState::setButtons(array $buttons) Stores