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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
 [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


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 [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.

.
 
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