Shop-Elvent replace

CModule::IncludeModule("iblock");

$i = 0;
$iblock_id = 16;
$arSelect = Array("ID", "DETAIL_TEXT", "NAME");
$arFilter = Array("IBLOCK_ID" => $iblock_id, "SECTION_ID" => 808, "INCLUDE_SUBSECTIONS"=>"Y"); // "SECTION_ID"=>52,
$res = CIBlockElement::GetList(Array('ID' => 'DESC'), $arFilter, false, false, $arSelect);
$arAllLog = [];
$el = new CIBlockElement;
while($ob = $res->GetNext()){
    //print_r($ob['DETAIL_TEXT']);die();
    $tmpDescr = explode('Купить ', $ob['DETAIL_TEXT']);
    if(count($tmpDescr) == 2) {
        if(substr_count($tmpDescr[1], '</div>') == 1){
            if(substr_count($ob['DETAIL_TEXT'], 'Layta.Ru') > 0) {
                $arAllLog['SUCCESS_ERROR'][] = $ob['ID'];
                $detailText = str_replace('Layta.Ru', 'shop-elvent.ru', $ob['DETAIL_TEXT']);
                if(!$el->Update($ob['ID'], ['DETAIL_TEXT' => $detailText])) $arAllLog['ERROR_UPDATE'][] = $ob['ID'];
            } else {
                $arAllLog['SUCCESS'][] = $ob['ID'];
                if(!$el->Update($ob['ID'], ['DETAIL_TEXT' => $tmpDescr[0] . '</div>'])) $arAllLog['ERROR_UPDATE'][] = $ob['ID'];
            }
        } else {
            $arAllLog['ERROR_DIV'][] = $ob['ID'];
        }
    } else {
        if(substr_count($ob['DETAIL_TEXT'], 'Layta.Ru') > 0) {
            $arAllLog['SUCCESS_POS'][] = $ob['ID'];
            $detailText = str_replace('Layta.Ru', 'shop-elvent.ru', $ob['DETAIL_TEXT']);
            if(!$el->Update($ob['ID'], ['DETAIL_TEXT' => $detailText])) $arAllLog['ERROR_UPDATE'][] = $ob['ID'];
        } else {
            if(empty($ob['DETAIL_TEXT'])) $arAllLog['EMPTY'][] = $ob['ID'];
            else $arAllLog['ERROR_EXPLODE'][] = $ob['ID'];
        }
    }
}
print_r([
    'SUCCESS' => count($arAllLog['SUCCESS']),
    'SUCCESS_POS' => count($arAllLog['SUCCESS_POS']),
    'SUCCESS_ERROR' => count($arAllLog['SUCCESS_ERROR']),
    'ERROR_UPDATE' => count($arAllLog['ERROR_UPDATE']),
    'ERROR_DIV' => count($arAllLog['ERROR_DIV']),
    'ERROR_EXPLODE' => count($arAllLog['ERROR_EXPLODE']),
    'EMPTY' => count($arAllLog['EMPTY']),
]);
print_r($arAllLog['ERROR_EXPLODE']);