Андрей Николаев (Все сообщения пользователя)

ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

/**
 * Sort
 */
$arSortedItems = [];

foreach( $arResult["ITEMS"] as $arItem )
{
   $tt_size = $arItem["DISPLAY_PROPERTIES"]["TT_SIZE"]["DISPLAY_VALUE"];

   $arSortedItems[ $tt_size ][$arItem['ID']] = &$arItem;
}

/**
 * Print
 */
foreach ($arSortedItems as $size)
{
   echo "<p>Size: {$size}</p>";
   // print table for this size $size - array of items
}