query("tank_level_log", "SELECT * FROM tank_level_log WHERE tank_id = $tank_id ORDER BY record_id DESC LIMIT 1");
$tank_level = $tank_level_res->fetch_assoc();
$tank_res = $db->query("tanks", "SELECT * FROM tanks WHERE record_id = $tank_id AND company_id = {$_SESSION['company_id']} ORDER BY record_id DESC");
$tank = $tank_res->fetch_assoc();
if ($tank['has_tank'] == 1) {
if ($tank["tank_type"] == "H_C") {
$data = $functions->calculate_horizontal_cylinder_volume($tank['radius_mm'], ($tank['radius_mm'] * 2) - $tank_level['distance'], $tank['length_mm']);
} else {
$data = $functions->calculate_vertical_cylinder_volume($tank['radius_mm'], ($tank['length_mm']) - $tank_level['distance'], $tank['length_mm']);
}
?>