How to assign role with PHP in Drupal?

Question

I need to assign a kind of \"premium status\" to members that purchase an amount equal or greater than 100 € via PHP.

Conditional Actions are already set up (user = anon

Answer 1

Just though I'd update the snippet for Drupal 7. Otherwise it works fine :)

$rid = db_query("SELECT r.rid FROM {role} r WHERE r.name = :rname", 
                array(':rname' => $role_name))->fetchField();