Error on writing const object property in 8.2

[MaxD2]

Description

The following code:

<?php

class Test {
    public int $x;
}

const test = new Test();

test->x = 1;

Resulted in this output:
Fatal error: Cannot use temporary expression in write context

https://3v4l.org/BmtTZ

PHP Version

PHP 8.1 - 8.2

Operating System

No response

[damianwadley]

Do you intend to define a constant named "test" whose value is an object? Or are you applying "const" thinking you're creating an immutable variable?

[MaxD2]

Yep, I define constant whose value is an object, that is possible since 8.1 and is a great feature.

I am able to call methods, read properties, but writing properties generate this error. More likely internally referring to the const object is some sort of expression.

[damianwadley]

I still get the impression you're thinking of this as being similar to const as seen in Javascript...

I'm not even sure this is really intended to be supported behavior: the docs continue to say that constants are scalars and arrays; the RFC which introduced this syntax devotes little more to it than a single line of sample code in an example, and I don't remember whether this was brought up in the pre-RFC discussions.

At the very least, I would assume -> in a write-context isn't allowed because the value is, after all, a constant and thus immutable, however the error message isn't clear that this is the reason.

[MaxD2]

It doesn't look like intended writing protection, this works pretty nice:
$temp = test; $temp->x = 1;

https://3v4l.org/Lb3X6

[KapitanOczywisty]

Duplicate of: #10497
Introduced: https://wiki.php.net/rfc/new_in_initializers

[MaxD2]

Ok, sorry. I tried searching before posting, but failed for some reason (

Is there any reason for this not being fixed? May I help any way?

[iluuu1994]

I created a PR here: #11788. If it lands, it will only land for PHP 8.3+ though.