How to display the message in Drupal 8?

Use the below methods:

\Drupal::messenger()->addStatus(t('Successful message.'));
\Drupal::messenger()->addWarning(t('Warning message.'));
\Drupal::messenger()->addError(t('Error message.'));

Get more info: Messager Service page


drupal_set_message(t('Successful Message'), 'status');



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