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Bug #46407 Wrong equality determination.
Submitted: 2008-10-28 14:24 UTC Modified: 2008-10-28 21:22 UTC
Votes:1
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: lambry_danchev at hotmail dot com Assigned:
Status: Not a bug Package: Math related
PHP Version: 5.2.6 OS: Linux SlackWare 12.1
Private report: No CVE-ID: None
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 [2008-10-28 14:24 UTC] lambry_danchev at hotmail dot com 
Description:
------------
Simple EQUATION was calculated incorrectly when some "magic" numbers was involved in.

Reproduce code:
---------------
<?php

if ( (0+12.44) == (7.44+5) )  {echo "TRUE";} else {echo "FALSE";}

?>


Expected result:
----------------
TRUE

Actual result:
--------------
FALSE

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 [2008-10-28 21:22 UTC] jani@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
 
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