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Asked: 2026-06-13T02:10:12+00:00

I am using this $grandtotal = round ($grandtotal, 2); to echo my calculated grandtotal

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I am using this

$grandtotal = round ($grandtotal, 2);

to echo my calculated grandtotal from a shopping cart, as without it i would get something like this:

27.999999997 due to decimals in the prices.

Question,

Can i count on the floating point inaccuracy to be allways somewhere in the 0.000000 area?

If it is allways such a small number rounding shouldnt be a problem and allways return the correct total right?

Or do i need a more sophisticated approach?

The store im working on will be a food delivery and it is not expected that people would order thousands of items so that inaccuracies of 0.00000002 would accumulate to 0.1.

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1 Answer

  1. Editorial Team

    If you use the round function throughout your calculation then there should be no problem.

    I’ve written a some accounting stuff in php and used the function with no great problems.
    But be sure to check the results against some good old paper&pencil calculations. 🙂

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