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Bug #75693 ArrayObject does not set dynamic values up from 7.1.4
Submitted: 2017-12-15 17:12 UTC Modified: 2017-12-16 17:07 UTC
Votes:1
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:0 (0.0%)
From: kodeart at gmail dot com Assigned:
Status: Verified Package: SPL related
PHP Version: Irrelevant OS:
Private report: No CVE-ID: None
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 [2017-12-15 17:12 UTC] kodeart at gmail dot com 
Description:
------------
The dynamic key/values in ArrayObject are not set starting from v7.1.4 (up to 7.2.0) when the key does not exists and the value is array (nested or otherwise).

The overridden ArrayObject methods in the class exists to provide a fluid interface (for offsetSet) and return the value or NULL as a special case (for offsetGet). It's not the best logic but the behavior is expected to be consistent in all (or at least) PHP 7.1 versions.

Test script:
---------------
https://3v4l.org/LQdPJ

Expected result:
----------------
The behavior should be consistent in all versions.

Actual result:
--------------
At the time of this report the dynamic key/value is

- set in 5.6.0 - 5.6.30, 7.0.0 - 7.1.3
- not set up from 7.1.4 - 7.2.0

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 [2017-12-16 17:07 UTC] nikic@php.net
-Status: Open +Status: Verified
 [2017-12-16 17:07 UTC] nikic@php.net 
This is due to the fix for bug #74058. The problem is that your offsetGet() method simply wasn't called previously (for this specific code). Now it is called, but does not work correctly, because offsetGet() needs to return by reference to support indirect array modification. You'd need something like this instead: https://3v4l.org/ZofH7

Unfortunately this doesn't work either, because ArrayObject::offsetGet() itself does not return by reference. We can't easily change it to return by reference, because that would require all classes extending ArrayObject to do so as well, which would be a BC break.
 
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