проверка поля веб формы

 function my_onBeforeResultAddUpdate($WEB_FORM_ID, $arFields, $arrVALUES)
{
  global $APPLICATION;
  
    if ($WEB_FORM_ID == 130) 
  {
   
    $arrVALUES['email_3371'] = intval($arrVALUES['email_3371']);
    if (isset($_POST['email'])
{
    if (check_email($_POST['email']))
    {
        global $DB;
        $arUsers = CUser::GetList("EMAIL_EXACT_MATCH" => "Y", "EMAIL" => $DB->ForSql($_POST['email']));
        
        if ($arUsers->SelectedRowsCount() == 0)
        {
            $errors[] = "Test";
        }
    }
}

if (count($errors) > 0)
{
   foreach($errors as $arIndex) ShowError($arIndex);
}   }
}


AddEventHandler('form', 'onBeforeResultAdd', 'my_onBeforeResultAddUpdate');
AddEventHandler('form', 'onBeforeResultUpdate', 'my_onBeforeResultAddUpdate');