FormSubmitter::executeSubmitHandlers

public FormSubmitter::executeSubmitHandlers(&$form, FormStateInterface &$form_state)

public function executeSubmitHandlers(&$form, FormStateInterface &$form_state) {
  // If there was a button pressed, use its handlers.
  $handlers = $form_state->getSubmitHandlers();
  // Otherwise, check for a form-level handler.
  if (!$handlers && !empty($form['#submit'])) {
    $handlers = $form['#submit'];
  }

  foreach ($handlers as $callback) {
    // Check if a previous _submit handler has set a batch, but make sure we
    // do not react to a batch that is already being processed (for instance
    // if a batch operation performs a
    //  \Drupal\Core\Form\FormBuilderInterface::submitForm()).
    if (($batch = &$this->batchGet()) && !isset($batch['id'])) {
      // Some previous submit handler has set a batch. To ensure correct
      // execution order, store the call in a special 'control' batch set.
      // See _batch_next_set().
      $batch['sets'][] = array('form_submit' => $callback);
      $batch['has_form_submits'] = TRUE;
    }
    else {
      call_user_func_array($form_state->prepareCallback($callback), array(&$form, &$form_state));
    }
  }
}