Doc #75924 [Com]: No doc: behavior of @ini_get('error_reporting') was changed from 5.6 to 7.0

Edit report at https://bugs.php.net/bug.php?id=75924&edit=1

 ID:                 75924
 Comment by:         bloogersitelist at gmail dot com
 Reported by:        mikko dot rantalainen at peda dot net
 Summary:            No doc: behavior of @ini_get('error_reporting') was
                     changed from 5.6 to 7.0
 Status:             Open
 Type:               Documentation Problem
 Package:            Scripting Engine problem
 Operating System:   Linux/Ubuntu
 PHP Version:        7.2.2
 Block user comment: N
 Private report:     N

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Previous Comments:
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[2018-02-06 13:36:33] [email protected]

The @ is not being ignored. Rather, (as I remember it) when @ suppresses error reporting it no longer affects the INI setting. ini_get() will properly report what the setting is, not the temporary value established during the expression evaluation. What I don't know/remember is whether this is tied to a bug report (couldn't find one) or one of 7.0's many other changes (AST?).

Since the behavior is from the @ I think noting the change is best suited for that doc page.
http://php.net/manual/en/language.operators.errorcontrol.php

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[2018-02-06 12:56:43] mikko dot rantalainen at peda dot net

Description:
------------
---
From manual page: http://www.php.net/function.error-reporting
---

The ini_get('error_reporting') was historically the only way to get same results as current implementation of error_reporting(). However, the behavior
of ini_get('error_reporting') was changed between PHP 5.6 and 7.0 but this has not been documented anywhere.

See https://3v4l.org/3lFoe for demo.

Note that this also affect all custom error handlers that inspect value of ini_get('error_reporting') and not just @ini_get() syntax.

I assume that PHP 7.x ignores at-sign by design (the function name suggests that this is the value set in the ini file) but this change is missing official documentation.

I'd prefer this to be documented in both http://www.php.net/function.error-reporting and http://php.net/manual/en/function.ini-get.php

Test script:
---------------
<?php
# different results for PHP 5.x and 7.x:
ini_set('error_reporting', 1);
$a = array();
$a['ini_get'] = ini_get('error_reporting');
$a['error_reporting'] = error_reporting();
$a['@ini_get'] = @ini_get('error_reporting');
$a['@error_reporting'] = @error_reporting();
var_export($a);

Expected result:
----------------
The output should be stable for all versions.

Actual result:
--------------
Behavior is stable for 5.x and all versions of hhvm. However, PHP 7.x will ignore the at-sign (@) in front of ini_get(). I believe that PHP 4.x used to work identical to 5.x here but I do not have any environment to test that.


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Edit this bug report at https://bugs.php.net/bug.php?id=75924&edit=1