public FormInterface::submitForm(array &$form, FormStateInterface $form_state)
Form submission handler.
array $form: An associative array containing the structure of the form.
\Drupal\Core\Form\FormStateInterface $form_state: The current state of the form.
public function submitForm(array &$form, FormStateInterface $form_state);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Form!FormInterface.php/function/FormInterface::submitForm/8.1.x