Re: [RFC] [DISCUSSION] More precise float value
| From: | Yasuo Ohgaki | Date: | Fri, 18 Sep 2015 21:28:26 +0000 |
| Subject: | Re: [RFC] [DISCUSSION] More precise float value | ||
| References: | 1 | Groups: | php.internals |
| Request: | Send a blank email to internals+get-88359@lists.php.net to get a copy of this message | ||
Hi all,
On Fri, Sep 4, 2015 at 9:41 AM, Yasuo Ohgaki <yohgaki@ohgaki.net> wrote:
> IEEE 754 double cannot express exact float values. That said,
> float values expressed by json/serialize/var_export/echo/print
> are not precise enough in many cases.
>
> Issues:
> - json_encode() uses EG(precision)=14 that truncates float values.
> echo()/print()
> does this as well.
> - large EG(precision)/PG(serialize_precision) prints meaningless values.
>
> This RFC proposes zend_dtoa()'s 0 mode support which rounds float value
> to nearest value.
>
> https://wiki.php.net/rfc/precise_float_value
> https://github.com/php/php-src/pull/1455
>
> This change is simple enough for PHP 7.0. IMO.
> Comments/suggestions are appreciated!
It's been 2 weeks and no comment for this.
I'll start voting.
Thanks.
--
Yasuo Ohgaki
yohgaki@ohgaki.net