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Doc Bug #80624 Undocumented change php 8 vs php 7 abs function
Submitted: 2021-01-14 16:21 UTC Modified: 2022-05-11 10:51 UTC
Votes:1
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:0 (0.0%)
Same OS:0 (0.0%)
From: ilyes dot ahidar at gmail dot com Assigned: cmb (profile)
Status: Closed Package: *Math Functions
PHP Version: 8.0.1 OS: Linux Fedora 33
Private report: No CVE-ID: None
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 [2021-01-14 16:21 UTC] ilyes dot ahidar at gmail dot com 
Description:
------------
---
From manual page: https://php.net/function.abs
---

The manual says that the abs() function accepts 1 argument of the type "mixed", but enabling strict_types and passing a string to the abs function outputs an type error.

Test script:
---------------
<?php

declare(strict_types=1);

$a = "0.00";

var_dump(abs($a));

Expected result:
----------------
In php 7 it would output:

float(0)

Actual result:
--------------
Fatal error: Uncaught TypeError: abs(): Argument #1 ($num) must be of type int|float, string given in /in/ZD7Kd:7
Stack trace:
#0 /in/ZD7Kd(7): abs('0.00')
#1 {main}
  thrown in /in/ZD7Kd on line 7

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 [2021-01-14 16:53 UTC] cmb@php.net
-Status: Open +Status: Verified
 [2021-01-14 16:54 UTC] cmb@php.net 
The following pull request has been associated:

Patch Name: Generate some standard methodsynopses based on stubs
On GitHub:  https://github.com/php/doc-en/pull/289
Patch:      https://github.com/php/doc-en/pull/289.patch
 [2021-05-19 16:17 UTC] cmb@php.net 
Related To: Bug #81054
 [2021-05-23 11:27 UTC] cmb@php.net
-Status: Verified +Status: Closed -Assigned To: +Assigned To: cmb
 [2021-05-23 11:27 UTC] cmb@php.net 
Fixed as <https://github.com/php/doc-en/commit/e2a460ca39fece49eefdd5bd2282e5ba7b488fea>.
 [2021-08-18 16:35 UTC] kawewong at gmail dot com 
This also is not in these pages

https://www.php.net/manual/en/migration80.incompatible.php
https://www.php.net/manual/en/migration80.deprecated.php
https://www.php.net/manual/en/migration80.other-changes.php

I could not find info about this and just let my php run until one day there are unknown errors and I find out that it is incompatible.

<?php
$num = '1.00';
var_dump(abs($num));// working fine until PHP 8.0+
?>

Maybe please update any one of these page.
 [2021-08-19 11:36 UTC] cmb@php.net 
See <https://github.com/php/doc-en/commit/6c7c7edf76fd09ac0e91ed702727bccf32e548e4>.
 [2022-05-11 10:20 UTC] post at andreas-mause dot de 
It's only a problem on empty string-values:

<?php
$num = '';
var_dump(abs($num));// working not until PHP 8.0+
?>

But "" is a string, so it should working ... so it's a bug?!
 [2022-05-11 10:51 UTC] cmb@php.net 
<https://3v4l.org/DXrcp> reports

| abs(): Argument #1 ($num) must be of type int|float, string given

In coercive type mode (the default) a string is juggled to an
int|float, if it is numeric[1].  An empty string is not considered
to be numeric.

[1] <https://www.php.net/manual/en/language.types.numeric-strings.php>
 
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