Using 1 for the last parameter to hw_incollections() simply results in the entire array given as the 
collection_ids parameter being returned, regardless of what the actual object/collection relationships
may be. Using 0 as the last parameter works as expected.


$arr = hw_incollections($hw_link, array(25, 169, 189), array(148, 218), 1);
print_r($arr);

$arr = hw_incollections($hw_link, array(0), array(148, 218), 1);
print_r($arr);

$arr = hw_incollections($hw_link, array(25, 169, 189), array(148, 218, 88495), 1);
print_r($arr);