bcmath sometimes returns float, and sometimes round result

Question

I have a variable $newTime, which is time in seconds made by mktime(), and I want to convert it into number of days.

In this case it is over 86.400 (which is a number of seconds in a day), and I try to divide it by 86.400 to get number of days (rounded).

But sometimes I get:

Case 1: 87951 / 86400 = 1.0179513888 (1 day ago)
Case 2: 156257 / 86400 = 1.8085300925 (2 days ago)

and sometimes:

Case 1: 87986 / 86400 = 1 (Should be 1 day ago)
Case 2: 156292 / 86400 = 1 (Should be 2 days ago)

This is the code:

$newTime = round(bcdiv($newTime, bcmul("24", bcmul("60", "60"))),0);

When I don't use bcmath, just the regular math ($newTime / (60*60*24)), I get floating results every time.

Answer 1

Have you set the scale using bcscale? If it is set to 0, it could explain the behaviour. Please, try to call bcscale(100) before your computation;

Answer 2

You could use:

$newTime = round( $newTime / (60 * 60 * 24));

With no bcmath at all please.

Examples:

$newTime = 156292;
$newTime = round( $newTime / (60 * 60 * 24));
echo $newTime; //2 Always

$newTime = 87986;
$newTime = round( $newTime / (60 * 60 * 24));
echo $newTime; //1 Always