php.net |  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login
Bug #53222 "less than" operator returning true even if numbers are equal
Submitted: 2010-11-02 02:06 UTC Modified: 2010-11-02 02:33 UTC
From: viliam dot kubis at gmail dot com Assigned:
Status: Not a bug Package: Scripting Engine problem
PHP Version: 5.3.3 OS: fedora 13
Private report: No CVE-ID: None
 [2010-11-02 02:06 UTC] viliam dot kubis at gmail dot com
Description:
------------
I am using the following PHP version:

PHP 5.3.3 (cli) (built: Jul 22 2010 15:57:00) 

Info: re-typing everything to (float), (double) or "no type specified" does not fix the problem.

Test script:
---------------
<? 
$min=(float)44;
$max=(float)54545;

$step=(float)($max-$min)/10;

if($step && $step>0)
{
	$i=$min;
	while($i<$max)
	{
		echo($i." &lt; $max ");
		var_dump($i,$max,$step);
		echo("<br />");
		$i+=$step;
	}
}
if($i>$max) echo("WHAT?");  ?> 

Expected result:
----------------
44 < 54545 float(44) float(54545) float(5450.1) 
5494.1 < 54545 float(5494.1) float(54545) float(5450.1) 
10944.2 < 54545 float(10944.2) float(54545) float(5450.1) 
16394.3 < 54545 float(16394.3) float(54545) float(5450.1) 
21844.4 < 54545 float(21844.4) float(54545) float(5450.1) 
27294.5 < 54545 float(27294.5) float(54545) float(5450.1) 
32744.6 < 54545 float(32744.6) float(54545) float(5450.1) 
38194.7 < 54545 float(38194.7) float(54545) float(5450.1) 
43644.8 < 54545 float(43644.8) float(54545) float(5450.1) 
49094.9 < 54545 float(49094.9) float(54545) float(5450.1) 


Actual result:
--------------
44 < 54545 float(44) float(54545) float(5450.1) 
5494.1 < 54545 float(5494.1) float(54545) float(5450.1) 
10944.2 < 54545 float(10944.2) float(54545) float(5450.1) 
16394.3 < 54545 float(16394.3) float(54545) float(5450.1) 
21844.4 < 54545 float(21844.4) float(54545) float(5450.1) 
27294.5 < 54545 float(27294.5) float(54545) float(5450.1) 
32744.6 < 54545 float(32744.6) float(54545) float(5450.1) 
38194.7 < 54545 float(38194.7) float(54545) float(5450.1) 
43644.8 < 54545 float(43644.8) float(54545) float(5450.1) 
49094.9 < 54545 float(49094.9) float(54545) float(5450.1) 
54545 < 54545 float(54545) float(54545) float(5450.1) 
WHAT?

Patches

Pull Requests

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2010-11-02 02:24 UTC] viliam dot kubis at gmail dot com
-Status: Open +Status: Closed
 [2010-11-02 02:24 UTC] viliam dot kubis at gmail dot com
I'm sorry, my mistake. Did not read carefully about floats in the manual. Sure you can't safely compare them for equality, but that also means you can't safely compare them with "<" and ">" operators. The code works when using BCMath. Thanks.
 [2010-11-02 02:33 UTC] pajoye@php.net
-Status: Closed +Status: Bogus
 
PHP Copyright © 2001-2025 The PHP Group
All rights reserved.
Last updated: Wed Jul 02 06:01:38 2025 UTC