What is the best way to notify about incorrect work?

Question

Zend Framework

Hello, tell me how best to implement the notification of incorrectly entered data. Authorization error and so on. Exception - seems to fit, but everyone advises using it in extreme cases like a database connection error. And every time to issue the ERROR_USER_AUTH variable and throw it along the function stack, it seems to me not true.

Answer 1

There is a formElementErrors view helper for displaying validation error messages .
It is enough to add the necessary validators for the form, but you can, of course, explicitly set the error message using the setMessages() method of the form element:

if ($form->isValid()) {
    $data = $form->getData($form::VALUES_AS_ARRAY);

    $authService = $this->getServiceLocator()->get('AuthenticationService');
    $authService->getAdapter()->setIdentity($data['identity'])->setCredential($data['password']);
    $result = $authService->authenticate();

    if (!$result->isValid()) {
        switch ($result->getCode()) {
            case $result::FAILURE_IDENTITY_NOT_FOUND :
                $form->get('identity')->setMessages(['Неверный логин']);
            break;
            case $result::FAILURE_CREDENTIAL_INVALID :
                $form->get('password')->setMessages(['Неверный пароль']);
            break;
            default :
                $form->get('identity')->setMessages(['Ошибка авторизации']);
            break;
        }
    }
}