Bug #80535 [Com]: Backward compatibility issue - FATAL error
Edit report at https://bugs.php.net/bug.php?id=80535&edit=1
ID: 80535
Comment by: rtrtrtrtrt at dfdfdfdf dot dfd
Reported by: legrand101 at gmail dot com
Summary: Backward compatibility issue - FATAL error
Status: Not a bug
Type: Bug
Package: Scripting Engine problem
PHP Version: 8.0.0
Assigned To: cmb
Block user comment: N
Private report: N
New Comment:
> I was upgrading from PHP7.0 so didn't get any warnings
your mistake
> This seems like a big inconvenience, special if
> one relied this behavior for API development
there was 7.1, 7.2, 7.3 and 7.4
sorry, but nobody can help you if you skip 4 major releases
there is a reason to introduce warnings years before
Previous Comments:
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[2020-12-20 20:39:14] legrand101 at gmail dot com
Thanks for the quick response. I was upgrading from PHP7.0 so didn't get any warnings. By
crash, I meant the my script was crashing.
So, is there any work around other than explicitly instantiating each variable. This seems like a
big inconvenience, special if one relied this behavior for API development.
------------------------------------------------------------------------
[2020-12-20 16:11:25] cmb@php.net
That code already issued E_WARNING as of PHP 7.4.0[1], and the
warning was promoted to an Error exception according to the
respective RFC[2]. It is also documented as backward incompatible
change in the migration guide[3].
Note that an Error exception is not a fatal error per se, and that
even a fatal error is not a crash.
[1] <https://3v4l.org/h3NJj>
[2] <https://wiki.php.net/rfc/engine_warnings>
[3] <https://www.php.net/manual/en/migration80.incompatible.php>
------------------------------------------------------------------------
[2020-12-20 16:01:11] legrand101 at gmail dot com
Description:
------------
After upgrading to PHP 8, I start getting FATAL error for simple statement that use to work on PHP
7. This statement is now producing a FATAL error (PHP Fatal error: Uncaught Error: Attempt to
modify property on null) on PHP 8:
$T = &$r->country->state->city;
Before PHP8 both $r and properties (r->country, r->country->state,
r->country->state->city) are implicitly instantiated as standard classs and $T is pointer.
Test script:
---------------
$T = &$r->country->state->city;
$T = 'home';
Expected result:
----------------
no fatal error. $r object implicitly created. $T and $r->country->state->city value are
'home'.
var_dump($r);
object(stdClass)#34 (1) {
["country"]=>
object(stdClass)#36 (1) {
["state"]=>
object(stdClass)#37 (1) {
["city"]=>
&string(4) "home"
}
}
}
var_dump($T);
string(4) "home"
Actual result:
--------------
PHP Fatal error: Uncaught Error: Attempt to modify property on null
------------------------------------------------------------------------
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