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Bug #39689 PHP converts float to integer incorrectly
Submitted: 2006-11-30 07:10 UTC Modified: 2006-11-30 09:28 UTC
From: toomuchphp-phpbugs at yahoo dot com Assigned:
Status: Not a bug Package: Math related
PHP Version: 5.2.0 OS: Mac OS X
Private report: No CVE-ID: None
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 [2006-11-30 07:10 UTC] toomuchphp-phpbugs at yahoo dot com 
Description:
------------
PHP converts some floats to integers incorrectly (I only know of one example).

Reproduce code:
---------------
<?php
echo strval(2169.99 * 100), "\n";
echo intval(2169.99 * 100), "\n"; // converts incorrectly


Expected result:
----------------
216999
216999


Actual result:
--------------
216999
216998

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 [2006-11-30 09:28 UTC] tony2001@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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