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Handling extremely large numbers with PHP

Posted on 2010-11-20
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I am creating a calculator app that needs to be able to handle large numbers accurately. Since integers larger than 2147483647 can't be handled by PHP, and floats have an accuracy issue:

echo floor((.7+.1)*10) //Outputs 7

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I need another solution. Is there any way to ensure accuracy with floats or another way to do math with php? Although I'd rather not use JS, as this means that someone can copy my processer, can JS handle large numbers?
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Question by:cloud-9
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armchang earned 2000 total points
ID: 34180475
Hi,

For some reason, there are two standard libraries in PHP handling the arbitrary length/precision numbers: BC Math and GMP. I personally prefer GMP, as it's fresher and has richer API.

Based on GMP I've implemented Decimal2 class for storing and processing currency amounts (like USD 100.25). A lot of mod calculations there and tried with very large numbers w/o any problems.

Go to GMP
Go to BC Math

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by:cloud-9
ID: 34183347
Thank-you for your quick response. This will work.
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