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Bug #44477 1990!=1990
Submitted: 2008-03-19 12:18 UTC Modified: 2008-03-19 12:26 UTC
From: ppalka3 at abacus dot pl Assigned:
Status: Not a bug Package: *General Issues
PHP Version: 5.2.5 OS: linux
Private report: No CVE-ID: None
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 [2008-03-19 12:18 UTC] ppalka3 at abacus dot pl 
Description:
------------
PHP Version 5.2.4

System 	Linux test2 2.6.19 #7 SMP PREEMPT Sun Dec 17 22:01:07 CET 2006 i686
Build Date 	Oct 16 2007 15:19:41
Configure Command 	'./configure' '--prefix=/usr/PHP5' '--with-config-file-path=/usr/PHP5' '--sysconfdir=/usr/PHP5' '--enable-track-vars' '--with-libxml-dir=/usr/include/libxml2' '--with-xml' '--enable-xslt' '--with-mysql=/usr/MYSQL_5.0.45' '--with-mysql-sock=/tmp/mysql.sock' '--with-iconv' '--with-jpeg-dir=/usr/lib/' '--enable-mbstring' '--enable-ftp' '--with-gd' '--with-zlib' '--with-gettext' '--enable-safe-mode' '--with-curl=/usr/local/include/curl' '--with-apxs=/usr/Apache/bin/apxs' '--with-mcrypt' '--with-imap=/usr/local/src/imap-2006k/' '--without-krb5'

Reproduce code:
---------------
$pay=19.90;
$pay_grosze=$pay*100;
$zaplacono=1990;



if($zaplacono!=$pay_grosze)
{
	echo $zaplacono."!=".$pay_grosze;
}else
{
	echo $zaplacono."=".$pay_grosze;
}

Expected result:
----------------
1990=1990

Actual result:
--------------
1990!=1990

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 [2008-03-19 12:26 UTC] scottmac@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
 
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