Bug #80286 [Opn->Ver]: Changing precision ini setting has no effect on const expressions
Edit report at https://bugs.php.net/bug.php?id=80286&edit=1
ID: 80286
Updated by: daverandom@php.net
Reported by: is dot malozemov at ya dot ru
-Summary: Math operation with precision in php.ini
+Summary: Changing precision ini setting has no effect on
const expressions
-Status: Open
+Status: Verified
Type: Bug
Package: *Math Functions
-Operating System: Linux Ubuntu 20.04 LTS
+Operating System: Any
-PHP Version: 7.3.23
+PHP Version: >=7
Block user comment: N
Private report: N
New Comment:
This issue occurs when a constant floating point operation is performed mid-string, the result is
computed and cast to string at compile time, so changing the ini option has no effect at run time.
https://3v4l.org/jjJZP
Previous Comments:
------------------------------------------------------------------------
[2020-10-27 08:00:39] is dot malozemov at ya dot ru
Description:
------------
Math operations ignores precision option in php.ini (php 7+);
Precision is works for PHP 5.
Test script:
---------------
<?php
$precision = 18;
while($precision--) {
ini_set('precision', $precision);
echo $precision.":".(342349.23 - 341765.07)."\n";
}
Expected result:
----------------
17:584.15999999997439
16:584.1599999999744
15:584.159999999974
14:584.15999999997
13:584.16
12:584.16
11:584.16
10:584.16
9:584.16
8:584.16
7:584.16
6:584.16
5:584.16
4:584.2
3:584
2:5.8E+2
1:6.0E+2
0:6.0E+2
Actual result:
--------------
17:5.8E+2
16:5.8E+2
15:5.8E+2
14:5.8E+2
13:5.8E+2
12:5.8E+2
11:5.8E+2
10:5.8E+2
9:5.8E+2
8:5.8E+2
7:5.8E+2
6:5.8E+2
5:5.8E+2
4:5.8E+2
3:5.8E+2
2:5.8E+2
1:5.8E+2
0:5.8E+2
------------------------------------------------------------------------
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Edit this bug report at https://bugs.php.net/bug.php?id=80286&edit=1
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