From: cf0hay at gmail dot com
Operating system: Linux 64bit (PHP 64bit too)
PHP version: 5.4.14
Package: Variables related
Bug Type: Bug
Bug description:var_export() does not use full precision for floating-point
numbers
Description:
------------
var_export() truncates floating-point precision. serialize() does not have
the same problem.
Test script:
---------------
<?php
$a = microtime(true);
echo "error of serialize(): ";
var_export($a - unserialize(serialize($a))); //This returns 0.
echo "\n";
echo "error of var_export(): ";
eval('$b = '.var_export($a,true).';');
var_export($a - $b); //Almost never 0.
echo "\n";
Expected result:
----------------
Exporting a floating-point value should generate enough digits to prevent
precision loss. The script above should always return 0 on the second case.
Actual result:
--------------
The difference between the original floating point value and the one
exported differs. The error is about 15 magnitude lower than the magnitude
of the value itself.
--
Edit bug report at https://bugs.php.net/bug.php?id=64760&edit=1
--
Try a snapshot (PHP 5.4):
https://bugs.php.net/fix.php?id=64760&r=trysnapshot54
Try a snapshot (PHP 5.3):
https://bugs.php.net/fix.php?id=64760&r=trysnapshot53
Try a snapshot (trunk):
https://bugs.php.net/fix.php?id=64760&r=trysnapshottrunk
Fixed in SVN: https://bugs.php.net/fix.php?id=64760&r=fixed
Fixed in release: https://bugs.php.net/fix.php?id=64760&r=alreadyfixed
Need backtrace: https://bugs.php.net/fix.php?id=64760&r=needtrace
Need Reproduce Script: https://bugs.php.net/fix.php?id=64760&r=needscript
Try newer version: https://bugs.php.net/fix.php?id=64760&r=oldversion
Not developer issue: https://bugs.php.net/fix.php?id=64760&r=support
Expected behavior: https://bugs.php.net/fix.php?id=64760&r=notwrong
Not enough info:
https://bugs.php.net/fix.php?id=64760&r=notenoughinfo
Submitted twice:
https://bugs.php.net/fix.php?id=64760&r=submittedtwice
register_globals: https://bugs.php.net/fix.php?id=64760&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=64760&r=php4
Daylight Savings: https://bugs.php.net/fix.php?id=64760&r=dst
IIS Stability: https://bugs.php.net/fix.php?id=64760&r=isapi
Install GNU Sed: https://bugs.php.net/fix.php?id=64760&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=64760&r=float
No Zend Extensions: https://bugs.php.net/fix.php?id=64760&r=nozend
MySQL Configuration Error: https://bugs.php.net/fix.php?id=64760&r=mysqlcfg
