/**
* Gets the total cost of all items in the invoice, using getTotal() on each Item,
* but does not apply tax.
*
* @var Invoice Invoice to total.
*
* @return float Total cost of the invoice Items.
*/
public function getSubTotal(Invoice $oInvoice)
{
$fSubTotal = 0.0;
$aItems = $oInvoice->getItems();
foreach ($aItems as $iKey => $oItem) {
$fSubTotal += $oItem->getTotal();
}
return $fSubTotal;
}
