WPCOM_VIP_Support_User::action_set_user_role PHP Method

    public function action_set_user_role($user_id, $role, $old_roles)
    {
        // Avoid recursing, while we're reverting
        if ($this->reverting_role) {
            return;
        }
        $user = new WP_User($user_id);
        // Try to make the conditional checks clearer
        $becoming_support = WPCOM_VIP_Support_Role::VIP_SUPPORT_ROLE == $role;
        $valid_and_verified_email = $this->is_a8c_email($user->user_email) && $this->user_has_verified_email($user_id);
        if ($becoming_support && !$valid_and_verified_email) {
            $this->reverting_role = true;
            // @FIXME This could be expressed more simply, probably :|
            if (!is_array($old_roles) || !isset($old_roles[0])) {
                if ($this->is_a8c_email($user->user_email)) {
                    $revert_role_to = WPCOM_VIP_Support_Role::VIP_SUPPORT_INACTIVE_ROLE;
                } else {
                    $revert_role_to = 'subscriber';
                }
            } else {
                $revert_role_to = $old_roles[0];
            }
            $this->demote_user_from_vip_support_to($user->ID, $revert_role_to);
            if ($this->is_a8c_email($user->user_email) && !$this->user_has_verified_email($user_id)) {
                $this->message_replace = self::MSG_BLOCK_UPGRADE_VERIFY_EMAIL;
                $this->send_verification_email($user_id);
            } else {
                $this->message_replace = self::MSG_BLOCK_UPGRADE_NON_A11N;
            }
            $this->reverting_role = false;
        }
    }