Drupal 8 add message

 \Drupal::messenger()->addMessage($message, 'status');
 \Drupal::messenger()->addMessage($message, 'warning');
 \Drupal::messenger()->addMessage($message, 'error');

Source: api.drupal.org

Drupal set message

$messenger = \Drupal::messenger();
$messenger->addMessage('STUFF', $messenger::TYPE_WARNING);

Source: api.drupal.org

Similar codes

0 vote251 views1 answer
Drupal 9 custom blocks dependency injection
PHP Drupal
0 vote289 views1 answer
Get node id in twig drupal
PHP Drupal
0 vote283 views1 answer
Drupal 7 hook_form_alter
PHP Drupal
1 vote285 views1 answer
Drupal 8 get taxonomy terms by vocabulary name
PHP Drupal
0 vote269 views2 answers
Drupal set message
PHP Drupal
0 vote239 views1 answer
Drupal 9 custom access checking for routes
PHP Drupal
1 vote283 views1 answer
Routing code in drupal 8
PHP Drupal
0 vote290 views1 answer
Drupal 8 entity_view
PHP Drupal
0 vote263 views1 answer
Provide filter condition in autocomplet field in drupal form using property
PHP Drupal
0 vote279 views1 answer
Drupal 9 remove field from view
PHP Drupal