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Bug #41357 substract integer part of a float value is not working well
Submitted: 2007-05-10 18:01 UTC Modified: 2007-05-10 18:40 UTC
From: gonzalolarralde at gmail dot com Assigned:
Status: Not a bug Package: *Math Functions
PHP Version: 5.2.2 OS: Ubuntu Linux
Private report: No CVE-ID: None
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From: gonzalolarralde at gmail dot com
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 [2007-05-10 18:01 UTC] gonzalolarralde at gmail dot com
When you try to get decimal part of a float number, if you substract integer number to float one, it returns the decimal part plus 0.00000000000001.

Reproduce code:

var_dump(214.16569 - 214);


Expected result:

Actual result:


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 [2007-05-10 18:40 UTC]
Floating point values have a limited precision. Hence a value might 
not have the same string representation after any processing. That also
includes writing a floating point value in your script and directly 
printing it without any mathematical operations.

If you would like to know more about "floats" and what IEEE
754 is read this:
Thank you for your interest in PHP.

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