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$res = CIBlockElement::GetList();
while($obRes = $res->GetNext){
    $props[] = CIBlockElement::GetProperty(IBLOCK_ID, ELEMENT_ID);
}

<?php 
$res = CIBlockElement::GetList();
$obRes = $res->GetNextElement;
$fields = $obRes->GetFiels;
$props = $obRes->GetProperties;
?>

$arSelect = array( PROPERTY_* );
$res = CIBlockElement::GetList();
while($obRes = $res->GetNext){
    $props[] = CIBlockElement::GetProperty(IBLOCK_ID, ELEMENT_ID);
}