/**
* Returns a modified line item tree where all the subtotals which have a total of 0
* are removed, and line items with a quantity of 0
*
* @param EE_Line_Item $line_item |null
* @return \EE_Line_Item|null
*/
public static function non_empty_line_items(EE_Line_Item $line_item)
{
$copied_li = EEH_Line_Item::non_empty_line_item($line_item);
if ($copied_li === null) {
return null;
}
//if this is an event subtotal, we want to only include it if it
//has a non-zero total and at least one ticket line item child
$ticket_children = 0;
foreach ($line_item->children() as $child_li) {
$child_li_copy = EEH_Line_Item::non_empty_line_items($child_li);
if ($child_li_copy !== null) {
$copied_li->add_child_line_item($child_li_copy);
if ($child_li_copy->type() === EEM_Line_Item::type_line_item && $child_li_copy->OBJ_type() === 'Ticket') {
$ticket_children++;
}
}
}
//if this is an event subtotal with NO ticket children
//we basically want to ignore it
if ($line_item->type() === EEM_Line_Item::type_sub_total && $line_item->OBJ_type() === 'Event' && $ticket_children === 0 && $line_item->total() === 0) {
return null;
}
return $copied_li;
}
