php.net |  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login
Bug #39302 integer/datatype error
Submitted: 2006-10-30 07:11 UTC Modified: 2006-10-30 07:45 UTC
From: paul at takizo dot com Assigned:
Status: Not a bug Package: Math related
PHP Version: 5.1.6 OS: FreeBSD 6.1 Released
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.
(description)
Block user comment
Status: Assign to:
Package:
Bug Type:
Summary:
From: paul at takizo dot com
New email:
PHP Version: OS:

 

 [2006-10-30 07:11 UTC] paul at takizo dot com
Description:
------------
I wrote a function to match a number and return result. But it seem like not working then certain integer is assigned.

It should return "hello world" When the loop value match 0.06, but it doesn't. But it works is other value assigned. For ecample 0.01, 0.02, 0.10 and etc.

Reproduce code:
---------------
function testing($selection = 0)
{
	for ($i = 0; $i <= 0.20; $i = $i + 0.01)
	{
		if($i == $selection)
		{
			echo 'hello world';
		}
	}
}	

testing(0.06);

Expected result:
----------------
hello world


Patches

Add a Patch

Pull Requests

Add a Pull Request

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2006-10-30 07:45 UTC] mike@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 © 2001-2020 The PHP Group
All rights reserved.
Last updated: Thu Feb 27 18:01:29 2020 UTC