PHP - Why does my computation produce a different result when I assign it to a variable?
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Published on 2010-04-24T16:51:51Z
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2010/04/24
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I want to round a number to a specific number of significant digits - basically I want the following function:
round(12345.67, 2) -> 12000
round(8888, 3) -> 8890
I have the following, but there's a strange problem.
function round_to_sf($number, $sf)
{
$mostsigplace = floor(log10(abs($number)))+1;
$num = $number / pow(10, ($mostsigplace-$sf));
echo ($number / pow(10, ($mostsigplace-$sf))).' '.$num.'<BR>';
}
round_to_sf(41918.522, 1);
Produces the following output:
4.1918522 -0
How can the result of a computation be different when it's assigned to a variable?
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