Bug #70173 [Opn]: Precision problem in float
| From: | cmb@php.net | Date: | Mon, 03 Aug 2015 13:06:41 +0000 |
| Subject: | Bug #70173 [Opn]: Precision problem in float | ||
| References: | 1 | Groups: | php.bugs |
| Request: | Send a blank email to php-bugs+get-194936@lists.php.net to get a copy of this message | ||
Edit report at https://bugs.php.net/bug.php?id=70173&edit=1
ID: 70173
Updated by: cmb@php.net
Reported by: rainer dot jung at kippdata dot de
Summary: Precision problem in float
Status: Open
Type: Bug
Package: *General Issues
Operating System: Solaris 10 Sparc
PHP Version: 7.0.0beta2
Block user comment: N
Private report: N
New Comment:
That might be related to the update of Zend/zend_strtod*[1].
[1] <https://github.com/php/php-src/commit/5d4616e2b08f20ce6a582587cf9d3e34775a43a4>
Previous Comments:
------------------------------------------------------------------------
[2015-07-31 05:53:27] rainer dot jung at kippdata dot de
Description:
------------
A precision problem in float makes a huge number of tests fail. It could well be, that this is a
platform specific failure (Solaris 10 Sparc, 32 Bit build).
Below you will find a test case with correct result returned from version 5.6.11 and wrong result
from 7.0.0 Beta 2.
Test script:
---------------
<?php
$var = 29000000;
var_dump($var);
$var = 290000000;
var_dump($var);
$var = 2900000000;
var_dump($var);
$var = 29000000000;
var_dump($var);
$var = 290000000000;
var_dump($var);
$var = 2900000000000;
var_dump($var);
$var = 29000000000000;
var_dump($var);
$var = 290000000000000;
var_dump($var);
$var = 2900000000000000;
var_dump($var);
?>
Expected result:
----------------
int(29000000)
int(290000000)
float(2900000000)
float(29000000000)
float(290000000000)
float(2900000000000)
float(29000000000000)
float(2.9E+14)
float(2.9E+15)
Actual result:
--------------
int(29000000)
int(290000000)
float(2899998720)
float(28999991296)
float(289999945728)
float(2899998408704)
float(28999988281344)
float(2.899999499223E+14)
float(2.8999984254812E+15)
------------------------------------------------------------------------
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Edit this bug report at https://bugs.php.net/bug.php?id=70173&edit=1