function multiply_two_lists($l1, $l2) {
$arr_l1 = explode(' ', trim($l1));
$arr_l2 = explode(' ', trim($l2));
foreach ($arr_l1 as $key => $value) {
$arr_result[$key] = $arr_l1[$key] * $arr_l2[$key];
}
return implode(' ', $arr_result);
}
echo multiply_two_lists(("2 5 6 10"), ("3 5 7 11"));
/*
run:
6 25 42 110
*/