Solved PHP float precision on FreeBSD 13.1-p0

spag

spag

Do we know how to control precision on OS level? Or maybe there is another reason for the wrong values.

Tested with PHP 8.1.7 and 7.4. Sometimes processes get to 100% usage giving blank pages but dtrace show there is nothing happening. The problem does not exists on Freebsd 13.

Code: 
# php a.php
(object) array(
   'a' => 0.01,
   'b' => 0.02,
   'c' => 0.029999999999999999,
   'd' => 0.040000000000000001,
   'e' => 0.050000000000000003,
   'f' => 0.059999999999999998,
   'g' => 0.070000000000000007,
   'h' => 0.080000000000000002,
   'i' => 0.089999999999999997,
   'j' => 0.10000000000000001,
   'k' => 0.11,
   'l' => 0.12,
)

Code: 
# php -v
PHP 8.1.7 (cli) (built: Jun 12 2022 00:24:18) (NTS)
Copyright (c) The PHP Group
Zend Engine v4.1.7, Copyright (c) Zend Technologies
    with Zend OPcache v8.1.7, Copyright (c), by Zend Technologies


PHP: 
<?php
ini_set('precision', 0);
var_export(json_decode('{"a": 0.01, "b": 0.02, "c": 0.03, "d": 0.04, "e": 0.05, "f": 0.06, "g": 0.07, "h": 0.08, "i": 0.09, "j": 0.10, "k": 0.11, "l": 0.12}'));

Python 3.9 looks good:

Python: 
Python 3.9.13 (main, May 22 2022, 13:55:38)
[Clang 13.0.0 (git@github.com:llvm/llvm-project.git llvmorg-13.0.0-0-gd7b669b3a on freebsd13
Type "help", "copyright", "credits" or "license" for more information.
>>> import json
>>> print(json.dumps({"a": 0.01, "b": 0.02, "c": 0.03, "d": 0.04, "e": 0.05, "f": 0.06, "g": 0.07, "h": 0.08, "i": 0.09, "j": 0.10, "k": 0.11, "l": 0.12}, sort_keys=True, indent=4))
{
    "a": 0.01,
    "b": 0.02,
    "c": 0.03,
    "d": 0.04,
    "e": 0.05,
    "f": 0.06,
    "g": 0.07,
    "h": 0.08,
    "i": 0.09,
    "j": 0.1,
    "k": 0.11,
    "l": 0.12
}
Any ideas? Thanks.
 
Can you try with others PHP versions ?
I can't reproduce the problem with PHP 8.0.20 on FreebSD 13.1

# php a.php
(object) array(
'a' => 0.01,
'b' => 0.02,
'c' => 0.03,
'd' => 0.04,
'e' => 0.05,
'f' => 0.06,
'g' => 0.07,
'h' => 0.08,
'i' => 0.09,
'j' => 0.1,
'k' => 0.11,
'l' => 0.12,
)
Click to expand...

# php -v
PHP 8.0.20 (cli) (built: Jun 18 2022 18:31:17) ( NTS )
Copyright (c) The PHP Group
Zend Engine v4.0.20, Copyright (c) Zend Technologies
with Zend OPcache v8.0.20, Copyright (c), by Zend Technologies
Click to expand...

# freebsd-version
13.1-RELEASE
Click to expand...
 
PHP: 
<?php
ini_set('precision', 0);
ini_set('serialize_precision', 0);

$json = '{"a": 0.01,"b": 0.02,"c": 0.03,"d": 0.04,"e": 0.05}';
var_export(json_decode($json, true));
var_dump(json_decode($json, true));

output:

Code: 
array (
  'a' => 0.01,
  'b' => 0.02,
  'c' => 0.03,
  'd' => 0.04,
  'e' => 0.05,
)test.php:8:
array(5) {
  'a' =>
  double(0.01)
  'b' =>
  double(0.02)
  'c' =>
  double(0.03)
  'd' =>
  double(0.04)
  'e' =>
  double(0.05)
}

PHP: 
<?php
ini_set('precision', 0);
ini_set('serialize_precision', 17);

$json = '{"a": 0.01,"b": 0.02,"c": 0.03,"d": 0.04,"e": 0.05}';
var_export(json_decode($json, true));
var_dump(json_decode($json, true));

output:

Code: 
array (
  'a' => 0.01,
  'b' => 0.02,
  'c' => 0.029999999999999999,
  'd' => 0.040000000000000001,
  'e' => 0.050000000000000003,
)test.php:8:
array(5) {
  'a' =>
  double(0.01)
  'b' =>
  double(0.02)
  'c' =>
  double(0.03)
  'd' =>
  double(0.04)
  'e' =>
  double(0.05)
}

notice the serialize_precision
 
OlivierW said:
Can you try with others PHP versions ?
I can't reproduce the problem with PHP 8.0.20 on FreebSD 13.1
Click to expand...
The same. on Freebsd 13.1 not on 13.0. The build is the same. Also, I have noticed that official packages work fine - but they are dedicated for v13.0
suntzu00 said:
what's the value for serialize_precision?
Click to expand...
Code: 
#php -i | grep prec 
precision => 14 => 14
serialize_precision => -1 => -1
(binary pkg)

#php -i | grep prec 
precision => 14 => 14
serialize_precision => 17 => 17
(own build)

This is binary package that works fine:
Code: 
#php -i
phpinfo()
PHP Version => 8.1.7

System => FreeBSD det006 13.1-RELEASE FreeBSD 13.1-RELEASE releng/13.1-n250148-fc952ac2212 GENERIC amd64
Build Date => Jun 11 2022 01:27:49
Build System => FreeBSD 130amd64-default-job-12 13.0-RELEASE-p11 FreeBSD 13.0-RELEASE-p11 amd64
Configure Command =>  './configure'  '--disable-all' '--program-prefix=' '--with-config-file-scan-dir=/usr/local/etc/php' '--with-layout=GNU' '--with-libxml' '--with-openssl' '--with-password-argon2=/usr/local' '--enable-dtrace' '--enable-embed' '--enable-fpm' '--with-fpm-group=www' '--with-fpm-user=www' '--enable-mysqlnd' '--prefix=/usr/local' '--localstatedir=/var' '--mandir=/usr/local/man' '--infodir=/usr/local/share/info/' '--build=amd64-portbld-freebsd13.0' 'build_alias=amd64-portbld-freebsd13.0' 'PKG_CONFIG=pkgconf' 'CFLAGS=-O2 -pipe -fstack-protector-strong -fno-strict-aliasing ' 'LDFLAGS=-L/usr/lib -lcrypto -lssl -fstack-protector-strong ' 'CPP=cpp' 'CXXFLAGS=-O2 -pipe -fstack-protector-strong -fno-strict-aliasing ' 'OPENSSL_CFLAGS=-I/usr/include' 'OPENSSL_LIBS=-L/usr/lib -lssl -lcrypto'

where my packages are built on 13.1 but the official repo points to 13.0.

Code: 
#sysctl -a | grep osrel
kern.osrelease: 13.1-RELEASE
kern.osreldate: 1301000
kern.disallow_high_osrel: 0
security.jail.param.linux.osrelease: 65
security.jail.param.osrelease: 32
security.jail.param.osreldate: 0
compat.linux.osrelease: 2.6.32

Code: 
 #pkg info lang/php81
php81-8.1.7
Name           : php81
Version        : 8.1.7
Installed on   : Mon Jun 27 20:29:20 2022 UTC
Origin         : lang/php81
Architecture   : FreeBSD:13:amd64
Prefix         : /usr/local
Categories     : www lang devel
Licenses       : PHP301
Maintainer     : bofh@FreeBSD.org
WWW            : https://www.php.net/
Comment        : PHP Scripting Language (8.1.X branch)
Options        :
        CGI            : on
        CLI            : on
        DEBUG          : off
        DTRACE         : on
        EMBED          : on
        FPM            : on
        IPV6           : on
        LINKTHR        : on
        MYSQLND        : on
        PHPDBG         : off
        ZTS            : off
Shared Libs required:
        libxml2.so.2
        libargon2.so.0
Shared Libs provided:
        libphp.so
Annotations    :
        FreeBSD_version: 1300139
        cpe            : cpe:2.3:a:php:php:8.1.7:::::freebsd13:x64
        repo_type      : binary
        repository     : FreeBSD
Flat size      : 29.9MiB


Setting ini_set('serialize_precision', 15); is almost good. This require to update all php.ini just in case.
 
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