Lequel des snippets de code suivants ne provoquera pas d'erreur?

Question

Dans le code de mon module Drupal 8 *beautiful*, quelles sont les formes correctes pour afficher un *message* à l’utilisateur en bonne pratique ?

Accepted Answer

drupal_set_message(t('Candidate %firstname %lastname was added.', ['%firstname' => $firstname, '%lastname' => $lastname]));

Accepted Answer

drupal_set_message($this->t('Candidate %firstname %lastname was added.', ['%firstname' => $firstname, '%lastname' => $lastname]));

Accepted Answer

drupal_set_message(t('Candidate %firstname %lastname was added.', array('%firstname' => $firstname, '%lastname' => $lastname)));

Answer

drupal_set_message(t('Candidate ' . $firstname . ' ' . $lastname . ' was added.'));

Answer

drupal_set_message($this->t('Candidate !firstname !lastname was added.', array('!firstname' => $firstname, '!lastname' => $lastname)));

Answer

drupal_set_message($this->t('Candidate ' . $firstname . ' ' . $lastname . ' was added.'));

Question du test Drupal 8