In Drupal 7 it was useful to do things like this:
function mymodule_content() {
$links[] = l('Google', 'http://www.google.com');
$links[] = l('Yahoo', 'http://www.yahoo.com');
return t('Links: !types', array('!types' => implode(', ', $links)));
}
In this case, we are using the exclamation mark to pass the $links into our string but unfortunately, Drupal 8 doesn’t have this option in the FormattableMarkup::placeholderFormat(), the good news is that even without this there is a way to accomplish the same thing.