UserModel::approve PHP Method

    public function approve($UserID, $Email)
    {
        $applicantRoleIDs = RoleModel::getDefaultRoles(RoleModel::TYPE_APPLICANT);
        // Make sure the $UserID is an applicant
        $RoleData = $this->getRoles($UserID);
        if ($RoleData->numRows() == 0) {
            throw new Exception(t('ErrorRecordNotFound'));
        } else {
            $AppRoles = $RoleData->result(DATASET_TYPE_ARRAY);
            $ApplicantFound = false;
            foreach ($AppRoles as $AppRole) {
                if (in_array(val('RoleID', $AppRole), $applicantRoleIDs)) {
                    $ApplicantFound = true;
                }
            }
        }
        if ($ApplicantFound) {
            // Retrieve the default role(s) for new users
            $RoleIDs = RoleModel::getDefaultRoles(RoleModel::TYPE_MEMBER);
            // Wipe out old & insert new roles for this user
            $this->saveRoles($UserID, $RoleIDs, false);
            // Send out a notification to the user
            $User = $this->getID($UserID);
            if ($User) {
                $Email = new Gdn_Email();
                $Email->subject(sprintf(t('[%1$s] Membership Approved'), c('Garden.Title')));
                $Email->to($User->Email);
                $message = sprintf(t('Hello %s!'), val('Name', $User)) . ' ' . t('You have been approved for membership.');
                $emailTemplate = $Email->getEmailTemplate()->setMessage($message)->setButton(externalUrl(signInUrl()), t('Sign In Now'))->setTitle(t('Membership Approved'));
                $Email->setEmailTemplate($emailTemplate);
                try {
                    $Email->send();
                } catch (Exception $e) {
                    if (debug()) {
                        throw $e;
                    }
                }
                // Report that the user was approved.
                $ActivityModel = new ActivityModel();
                $ActivityModel->save(['ActivityUserID' => $UserID, 'ActivityType' => 'Registration', 'HeadlineFormat' => t('HeadlineFormat.Registration', '{ActivityUserID,You} joined.'), 'Story' => t('Welcome Aboard!')], false, ['GroupBy' => 'ActivityTypeID']);
                // Report the approval for moderators.
                $ActivityModel->save(['ActivityType' => 'Registration', 'ActivityUserID' => Gdn::session()->UserID, 'RegardingUserID' => $UserID, 'NotifyUserID' => ActivityModel::NOTIFY_MODS, 'HeadlineFormat' => t('HeadlineFormat.RegistrationApproval', '{ActivityUserID,user} approved the applications for {RegardingUserID,user}.')], false, ['GroupBy' => ['ActivityTypeID', 'ActivityUserID']]);
                Gdn::userModel()->saveAttribute($UserID, 'ApprovedByUserID', Gdn::session()->UserID);
            }
        }
        return true;
    }