Bug #72567 [NEW]: json_encode results in rounding errors when encoding floats
From: sjon at hortensius dot net
Operating system: 3v4l.org
PHP version: Next Major Version
Package: JSON related
Bug Type: Bug
Bug description:json_encode results in rounding errors when encoding floats
Description:
------------
Not sure what the correct terminology is for this; but it seems using
json_encode with floats will result in 'rounding errors' as illustrated
by the script below. This happens since alpha3 as can be seen on
https://3v4l.org/q3SU6
Using JSON_NUMERIC_CHECK has no influence as can be seen on the original
https://3v4l.org/TvGbe
Test script:
---------------
<?php
echo json_encode(array(0.1, 0.2, 0.3, 0.4, 0.5, 0.6,));
Expected result:
----------------
[0.1,0.2,0.3,0.4,0.5,0.6]
Actual result:
--------------
[0.100000000000000005551115,0.20000000000000001110223,0.29999999999999998889777,0.40000000000000002220446,0.5,0.59999999999999997779554]
--
Edit bug report at https://bugs.php.net/bug.php?id=72567&edit=1
--
Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=72567&r=trysnapshot54
Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=72567&r=trysnapshot55
Try a snapshot (trunk): https://bugs.php.net/fix.php?id=72567&r=trysnapshottrunk
Fixed in SVN: https://bugs.php.net/fix.php?id=72567&r=fixed
Fixed in release: https://bugs.php.net/fix.php?id=72567&r=alreadyfixed
Need backtrace: https://bugs.php.net/fix.php?id=72567&r=needtrace
Need Reproduce Script: https://bugs.php.net/fix.php?id=72567&r=needscript
Try newer version: https://bugs.php.net/fix.php?id=72567&r=oldversion
Not developer issue: https://bugs.php.net/fix.php?id=72567&r=support
Expected behavior: https://bugs.php.net/fix.php?id=72567&r=notwrong
Not enough info: https://bugs.php.net/fix.php?id=72567&r=notenoughinfo
Submitted twice: https://bugs.php.net/fix.php?id=72567&r=submittedtwice
register_globals: https://bugs.php.net/fix.php?id=72567&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=72567&r=php4
Daylight Savings: https://bugs.php.net/fix.php?id=72567&r=dst
IIS Stability: https://bugs.php.net/fix.php?id=72567&r=isapi
Install GNU Sed: https://bugs.php.net/fix.php?id=72567&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=72567&r=float
No Zend Extensions: https://bugs.php.net/fix.php?id=72567&r=nozend
MySQL Configuration Error: https://bugs.php.net/fix.php?id=72567&r=mysqlcfg
Thread (1 message)
- sjon at hortensius dot net