Drupal 8 Module Development - Second Edition

Implementing hook_mail()

As I mentioned earlier, the first step for sending mails in Drupal 8 is implementing hook_mail(). In our case, it can look something like this:

/** * Implements hook_mail(). */function hello_world_mail($key, &$message, $params) {  switch ($key) {    case 'hello_world_log':      $message['from'] = \Drupal::config('system.site')->get('mail');      $message['subject'] = t('There is an error on your website');      $message['body'][] = $params['message'];      break;  }}

This hook receives three parameters:

• the message key (template) that is used to send the mail
• the message of the email that needs to be filled in
• an array of parameters passed from the client code

As you can see, we are defining a key (or template) named hello_world_log, which ...