php.net |  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login

go to bug id or search bugs for

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
View Developer Edit
Welcome back! If you're the original bug submitter, here's where you can edit the bug or add additional notes.
If you forgot your password, you can retrieve your password here.
Password:
Status:
Package:
Bug Type:
Summary:
From: lambry_danchev at hotmail dot com
New email:
PHP Version: OS:

 

 [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

Patches

Pull Requests

History

AllCommentsChangesGit/SVN commitsRelated reports
 [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
 
Thank you for your interest in PHP.
 
PHP Copyright © 2001-2024 The PHP Group
All rights reserved. 		Last updated: Sat Dec 21 14:01:32 2024 UTC