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

go to bug id or search bugs for

Bug #49747 floor() issue
Submitted: 2009-10-02 10:27 UTC Modified: 2009-10-02 11:30 UTC
From: rajiv dot ambegaokar at oracle dot com Assigned:
Status: Not a bug Package: Math related
PHP Version: 5.2.11 OS: Windows XP
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: rajiv dot ambegaokar at oracle dot com
New email:
PHP Version: OS:

 

 [2009-10-02 10:27 UTC] rajiv dot ambegaokar at oracle dot com 
Description:
------------
Floor function not working properly.

Reproduce code:
---------------
<?php
$a = 43.1234 ;
$a = floor($a * 10000);
echo $a;
 ?>

Expected result:
----------------
431234

Actual result:
--------------
431233

Patches

Pull Requests

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2009-10-02 11:30 UTC] sjoerd@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 © 2001-2026 The PHP Group
All rights reserved. 		Last updated: Sat Jan 10 01:00:01 2026 UTC