UserModel::saveAdminUser PHP Method

    public function saveAdminUser($FormPostValues)
    {
        $UserID = 0;
        // Add & apply any extra validation rules:
        $Name = val('Name', $FormPostValues, '');
        $FormPostValues['Email'] = val('Email', $FormPostValues, strtolower($Name . '@' . Gdn_Url::host()));
        $FormPostValues['ShowEmail'] = '0';
        $FormPostValues['TermsOfService'] = '1';
        $FormPostValues['DateOfBirth'] = '1975-09-16';
        $FormPostValues['DateLastActive'] = Gdn_Format::toDateTime();
        $FormPostValues['DateUpdated'] = Gdn_Format::toDateTime();
        $FormPostValues['Gender'] = 'u';
        $FormPostValues['Admin'] = '1';
        $this->addInsertFields($FormPostValues);
        if ($this->validate($FormPostValues, true) === true) {
            $Fields = $this->Validation->schemaValidationFields();
            // Only fields that are present in the schema
            // Insert the new user
            $UserID = $this->insertInternal($Fields, ['NoConfirmEmail' => true, 'Setup' => true]);
            if ($UserID > 0) {
                $ActivityModel = new ActivityModel();
                $ActivityModel->save(['ActivityUserID' => $UserID, 'ActivityType' => 'Registration', 'HeadlineFormat' => t('HeadlineFormat.Registration', '{ActivityUserID,You} joined.'), 'Story' => t('Welcome Aboard!')], false, ['GroupBy' => 'ActivityTypeID']);
            }
            $this->saveRoles($UserID, [16], false);
        }
        return $UserID;
    }