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Date: Sun, 17 Oct 2021 12:05:34 +0200
Message-ID: <CAG9XoMSVinM5B9MHYfEiWLzAU6-ng+3VGq9nk8q1aVUxjdeS2w@mail.gmail.com>
To: PHP Internals <internals@lists.php.net>
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Subject: Change of $depth behaviour in json_encode() on PHP 8.1
From: benjamin.morel@gmail.com (Benjamin Morel)

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Hi internals,

I noticed a change of behaviour on PHP 8.1:

https://3v4l.org/DoG4A

```
// depth 1
$a =3D new \stdClass();

// depth 2
$b =3D new \stdClass();
$b->x =3D $a;

// depth 3
$c =3D new \stdClass();
$c->x =3D [$a];

var_export(json_encode($a, 0, 0)); echo "\n";
var_export(json_encode($b, 0, 1)); echo "\n";
var_export(json_encode($c, 0, 2));
```

On PHP 8.1, all three examples successfully encode the input object, while
on PHP <=3D 8.0, json_encode() returns false as this exceeds the max depth.

I couldn't find a note about this in the migration guide for PHP 8.1. Is
this documented, or is this a regression that should be fixed?

Thanks in advance,
=E2=80=94 Benjamin

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