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Bug #52285 serialize float number to loss precision~
Submitted: 2010-07-08 11:34 UTC Modified: 2010-07-08 11:49 UTC
From: paulgao at yeah dot net Assigned:
Status: Not a bug Package: Variables related
PHP Version: Irrelevant OS: irrelevant
Private report: No CVE-ID: None
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From: paulgao at yeah dot net
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 [2010-07-08 11:34 UTC] paulgao at yeah dot net 
Description:
------------
serialize float number to loss precision.

Test script:
---------------
php -r 'var_dump(serialize(0.23));'


Expected result:
----------------
string(7) "d:0.23;"

Actual result:
--------------
string(60) "d:0.2300000000000000099920072216264088638126850128173828125;"

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 [2010-07-08 11:49 UTC] aharvey@php.net
-Status: Open +Status: Bogus
 [2010-07-08 11:49 UTC] aharvey@php.net 
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:
http://docs.sun.com/source/806-3568/ncg_goldberg.html
 
Thank you for your interest in PHP.
 
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