php.net |  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login

go to bug id or search bugs for

Doc Bug #78081 Cannot write literal -9223372036854775808, do -922..807 - 1 instead
Submitted: 2019-05-29 05:59 UTC Modified: 2019-05-29 08:21 UTC
From: memory dot agape at gmail dot com Assigned:
Status: Duplicate Package: Variables related
PHP Version: 7.2.18 OS: MacOS
Private report: No CVE-ID: None
View Developer Edit
Welcome back! If you're the original bug submitter, here's where you can edit the bug or add additional notes.
If you forgot your password, you can retrieve your password here.
Password:
Status:
Package:
Bug Type:
Summary:
From: memory dot agape at gmail dot com
New email:
PHP Version: OS:

 

 [2019-05-29 05:59 UTC] memory dot agape at gmail dot com 
Description:
------------
I tried to output a negative value -9223372036854775808 but it will show a double type value.
It expected an integer value.



My PHP version is shown below:
> php -v
> PHP 7.2.18 (cli) (built: May 21 2019 20:18:44) ( NTS )
> Copyright (c) 1997-2018 The PHP Group
> Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies
>     with Xdebug v2.7.2, Copyright (c) 2002-2019, by Derick Rethans
>     with Zend OPcache v7.2.18, Copyright (c) 1999-2018, by Zend Technologies


Test script:
---------------
<?php
 
var_dump(PHP_INT_MIN);
var_dump(-9223372036854775808);
var_dump((int) -9223372036854775808);
var_dump(-9223372036854775807);
var_dump(PHP_INT_MAX);
var_dump(9223372036854775807);

?>

Expected result:
----------------
int(-9223372036854775808)
int(-9223372036854775808)
int(-9223372036854775808)
int(-9223372036854775807)
int(9223372036854775807)
int(9223372036854775807)


Actual result:
--------------
int(-9223372036854775808)
double(-9.2233720368548E+18)
int(-9223372036854775808)
int(-9223372036854775807)
int(9223372036854775807)
int(9223372036854775807)

Patches

Pull Requests

History

AllCommentsChangesGit/SVN commitsRelated reports
 [2019-05-29 06:10 UTC] requinix@php.net
-Status: Open +Status: Not a bug -Package: *General Issues +Package: Scripting Engine problem
 [2019-05-29 06:10 UTC] requinix@php.net 
This is a quirk of how PHP parses code: -1 is actually the number 1 negated, and since -9223372036854775808 is too large for a positive integer it overflows to float and *then* is negated.

You cannot write -9223372036854775808 as a literal. Write -9223372036854775807 - 1 instead.
 [2019-05-29 06:26 UTC] memory dot agape at gmail dot com 
Thank you for your quick reply!
Is it information written in some document?
 [2019-05-29 06:41 UTC] requinix@php.net 
...I don't know. Last time I remember this coming up it was from a bug report - in fact within the last month or so, I think.
 [2019-05-29 07:00 UTC] requinix@php.net
-Summary: I tried to output -9223372036854775808 but it will show -9.2233720368548E+18 +Summary: Cannot write literal -9223372036854775808, do -922..807 - 1 instead -Status: Not a bug +Status: Open -Type: Bug +Type: Documentation Problem -Package: Scripting Engine problem +Package: Variables related
 [2019-05-29 07:00 UTC] requinix@php.net 
I don't see it mentioned anywhere. I'd at least expect a note on the integers page.
 [2019-05-29 07:55 UTC] bwoebi@php.net
-Status: Open +Status: Duplicate
 [2019-05-29 07:55 UTC] bwoebi@php.net 
This behavior is somewhat known, also do write PHP_INT_MIN instead.

But yeah, I consider this somewhat unfortunate (especially in generated code, where I ended up having to write an explicit condition for if min value, then print PHP_INT_MIN, else the value...).
This should really be fixed in PHP itself, I think...

But for now marking as a dupe of #53934.
 [2019-05-29 08:21 UTC] cmb@php.net 
See also <https://github.com/php/php-src/blob/31a516cf967e7558f0e06c2390fa9521309ed8b4/ext/standard/var.c#L490-L491>.
 [2019-07-30 15:38 UTC] requinix@php.net 
Related To: Bug #78354
 
PHP Copyright © 2001-2024 The PHP Group
All rights reserved. 		Last updated: Sun Dec 22 11:01:30 2024 UTC