add(1.23, 4.56) . "\n"; echo "sub(1.23, 4.56) = " . $service->sub(1.23, 4.56) . "\n"; echo "mul(1.23, 4.56) = " . $service->mul(1.23, 4.56) . "\n"; echo "div(1.23, 4.56) = " . $service->div(1.23, 4.56) . "\n"; ?>