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Bug #74109 round() PHP_ROUND_HALF_DOWN mode is broken
Submitted: 2017-02-16 13:52 UTC Modified: 2017-02-16 15:42 UTC
From: pandenitz at mail dot ru Assigned:
Status: Not a bug Package: *General Issues
PHP Version: 7.0.16 OS: Win 7 64
Private report: No CVE-ID: None
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From: pandenitz at mail dot ru
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 [2017-02-16 13:52 UTC] pandenitz at mail dot ru 
Description:
------------
PHP_ROUND_HALF_DOWN mode for round() doesn't work, it still increments last allowed decimal digit if next is larger than 4

Test script:
---------------
var_dump(100 / 6);
var_dump(round(100 / 6, 4, PHP_ROUND_HALF_UP));
var_dump(round(100 / 6, 4, PHP_ROUND_HALF_DOWN));

Expected result:
----------------
float 16.666666666667
float 16.6667
float 16.6666

Actual result:
--------------
float 16.666666666667
float 16.6667
float 16.6667

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 [2017-02-16 15:42 UTC] requinix@php.net
-Status: Open +Status: Not a bug
 [2017-02-16 15:42 UTC] requinix@php.net 
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

http://php.net/manual/en/function.round.php
> Round val down to precision decimal places towards zero, when it is half way
> there. Making 1.5 into 1 and -1.5 into -1.

6 is not half way.
 
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