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Bug #71451 var_export() wrong output
Submitted: 2016-01-26 08:15 UTC Modified: 2016-02-08 01:40 UTC
From: nask0 at cod3r dot net Assigned:
Status: Not a bug Package: *General Issues
PHP Version: 5.6.17 OS: Fedora release 23 (Twenty Three)
Private report: No CVE-ID: None
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 [2016-01-26 08:15 UTC] nask0 at cod3r dot net 
Description:
------------
var_export(1.001) outputs 1.0009999999999999 instead of 1.001


Test script:
---------------
Run in CLI :
php -r "var_export(1.001); echo \"\n\"; var_dump(1.001);"

Expected result:
----------------
1.001
double(1.001)

Actual result:
--------------
1.0009999999999999
double(1.001)

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 [2016-01-26 13:47 UTC] rasmus@php.net
-Status: Open +Status: Not a bug
 [2016-01-26 13:47 UTC] rasmus@php.net 
This is because var_export() is a serialization function and thus uses the serialization_precision setting. Try this:

php -d serialize_precision=14 -r 'var_export(1.001); echo "\n" ; var_dump(1.001);'

If you set your precision and serialize_precision to the same value you will get the same output from var_dump() and var_export(). var_dump() is not a serialization function since its output can't be read back in by anything. It is just for display purposes.
 [2016-02-08 01:40 UTC] yohgaki@php.net 
This is not a bug, but there is RFC for this

https://wiki.php.net/rfc/precise_float_value

JSON numeric defacto standard representation is a concern also.
 
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