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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
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 [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?

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 [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
 
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