Rosen wrote:
I use some numbers from mysql table and other local vars to calculate one number. But on one calc I receive thath $value=4.5474735088646E-013; This must be zero (0) - I see all vars and calc then with calculator. I use function number_format($value, 2, ".", "" ) and it return me -0.00
When you use floating point numbers, you can get small errors like this. To the computer, 4.54E-13 is about the same as zero. number_format() returns the correct result... well, the negative sign may throw you off. You can use abs() and round() to get what you want, more than likely.
The thing to remember and react accordingly to is that for floating point numbers, 2.0 - 1.5 can equal 0.4999999999999999 and be "correct" because of the precision.
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