How to display products with the same property value in the product card?

Question

1C-Bitrix

Good day!
It is necessary to display in the product card only those products whose property value matches the property value of the product itself. Tell me please.
Example:
1) there is a product "Product1", property "Collection", property type "Directory". The value of the property "Collection" = "Test collection"
2) there is a product "Product2", property "Collection", property type "Directory". The value of the property "Collection" = "Test collection"
3) there is a product "Product3", property "Collection", property type "Directory". The value of the property "Collection" = "Test collection"
It is necessary to display the goods "

$arSelect = Array("ID", "IBLOCK_ID", "NAME","PROPERTY_*");
$arFilter = Array("IBLOCK_ID"=>$arParams['IBLOCK_ID'], "ACTIVE"=>"Y", "PROPERTY_KOLLEKTSIYA"=>$arResult['DISPLAY_PROPERTIES']['KOLLEKTSIYA']['DISPLAY_VALUE']);
$res = CIBlockElement::GetList(Array("SORT"=>"ASC"), $arFilter, false, false, Array());
while($ar_fields = $res->Fetch())
{
  echo "<pre>" .print_r($arFields,1)."</pre>";
}

Answer 1

If you want to filter exactly by the text value of the list, you should use 'PROPERTY_KOLLEKTSIYA_VALUE' => ... in the filter,
but this will not be optimal in terms of query execution speed.
It is better to use search by value ID in the list. Look in the $arResult['DISPLAY_PROPERTIES']['KOLLEKTSIYA'] array in which property the ID of the list element is stored, unfortunately I don't remember which key to use.