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Bug #76824 number_format produces different signed result
Submitted: 2018-08-30 22:37 UTC Modified: 2018-08-30 22:48 UTC
From: jamesin dot hongkong dot 1 at gmail dot com Assigned:
Status: Not a bug Package: *General Issues
PHP Version: 7.2.9 OS:
Private report: No CVE-ID: None
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 [2018-08-30 22:37 UTC] jamesin dot hongkong dot 1 at gmail dot com 
Description:
------------
One of our integration tests failed starting with PHP 7.2+ due to a different return value from number_format.

## Reproducible example

```
Output for 7.2.0 - 7.3.0beta2
0.00000

Output for 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.28 - 7.1.21
-0.00000
```

https://3v4l.org/WtLF8

Test script:
---------------
print number_format( -0.000000000004566, 5 );

Expected result:
----------------
-0.00000

Actual result:
--------------
0.00000

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 [2018-08-30 22:48 UTC] danack@php.net
-Status: Open +Status: Not a bug
 [2018-08-30 22:48 UTC] danack@php.net 
This is a deliberate change:

http://php.net/manual/en/migration72.incompatible.php

Previously, it was possible for the number_format() function to return -0. Whilst this is perfectly valid according to the IEEE 754 floating point specification, this oddity was not desirable for displaying formatted numbers in a human-readable form.
 
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