|  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login
Bug #54414 Floating-Point Arithmetic Bug
Submitted: 2011-03-28 20:57 UTC Modified: 2011-03-28 21:32 UTC
From: ejsexton82 at gmail dot com Assigned:
Status: Not a bug Package: Math related
PHP Version: 5.3.6 OS: Windows Server 2003
Private report: No CVE-ID: None
View Add Comment Developer Edit
Welcome! If you don't have a Git account, you can't do anything here.
You can add a comment by following this link or if you reported this bug, you can edit this bug over here.
Block user comment
Status: Assign to:
Bug Type:
From: ejsexton82 at gmail dot com
New email:
PHP Version: OS:


 [2011-03-28 20:57 UTC] ejsexton82 at gmail dot com
The following calculation yields an unexpected result.

Test script:
$test = 625.0 - 661.7 + 37.0;

Expected result:

Actual result:


Add a Patch

Pull Requests

Add a Pull Request


AllCommentsChangesGit/SVN commitsRelated reports
 [2011-03-28 21:32 UTC]
-Status: Open +Status: Bogus
 [2011-03-28 21:32 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.

PHP Copyright © 2001-2024 The PHP Group
All rights reserved.
Last updated: Fri Jun 14 12:01:29 2024 UTC