Сортировка значений свойства инфоблока

<?if (!defined("B_PROLOG_INCLUDED") || B_PROLOG_INCLUDED!==true)die();

if (isset($arParams["TEMPLATE_THEME"]) && !empty($arParams["TEMPLATE_THEME"]))
{
   $arAvailableThemes = array();
   $dir = trim(preg_replace("'[\\\\/]+'", "/", dirname(__FILE__)."/themes/"));
   if (is_dir($dir) && $directory = opendir($dir))
   {
      while (($file = readdir($directory)) !== false)
      {
         if ($file != "." && $file != ".." && is_dir($dir.$file))
            $arAvailableThemes[] = $file;
      }
      closedir($directory);
   }

   if ($arParams["TEMPLATE_THEME"] == "site")
   {
      $solution = COption::GetOptionString("main", "wizard_solution", "", SITE_ID);
      if ($solution == "eshop")
      {
         $theme = COption::GetOptionString("main", "wizard_eshop_adapt_theme_id", "blue", SITE_ID);
         $arParams["TEMPLATE_THEME"] = (in_array($theme, $arAvailableThemes)) ? $theme : "blue";
      }
   }
   else
   {
      $arParams["TEMPLATE_THEME"] = (in_array($arParams["TEMPLATE_THEME"], $arAvailableThemes)) ? $arParams["TEMPLATE_THEME"] : "blue";
   }
}
else
{
   $arParams["TEMPLATE_THEME"] = "blue";
}
?>