Symfony: get form error messages

symfony-form-error-messages.md

use Symfony\Component\Form\FormErrorIterator;

/**
 * @param FormErrorIterator $formErrors
 * @return array
 */
private function getErrorMessages(FormErrorIterator $formErrors) {
    $errorMessages = [];

    foreach ($formErrors as $formError) {
        $errorMessages[] = $formError->getMessage();
    }

    return $errorMessages;
}

Possible ways of use:

$errorMessages = $this->getErrorMessages($form->getErrors(true));

or

$errorMessages = $this->getErrorMessages($form->get('fieldName')->getErrors());