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Bug #46407 Wrong equality determination.
Submitted: 2008-10-28 14:24 UTC Modified: 2008-10-28 21:22 UTC
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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From: lambry_danchev at hotmail dot com
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 [2008-10-28 14:24 UTC] lambry_danchev at hotmail dot com
Simple EQUATION was calculated incorrectly when some "magic" numbers was involved in.

Reproduce code:

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


Expected result:

Actual result:


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 [2008-10-28 21:22 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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