$PROP = [
‘MY_PROP’ => ‘value1’ // как сюда добавить описание значения?
];
$arLoadProductArray = array(
"MODIFIED_BY" => $USER->GetID(),
"IBLOCK_SECTION_ID" => false,
"IBLOCK_ID" => 1,
"PROPERTY_VALUES" => $PROP,
"NAME" => ‘test’,
"ACTIVE" => "Y",
"ACTIVE_FROM" => date("d.m.Y H:i:s"),
);
$el->Update($id, $arLoadProductArray);