php / php/php-src

8.3 - cannot set finality and visibility for method from trait at the same time

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Bug Status: Needs Triage
Dominant language
C
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Description

Description

The following code:

<?php

trait SimpleTrait
{
    private function foo() {}
}

class TraitFixtureWithFinalAndProtected
{
    use SimpleTrait {
        foo as final protected;
    }
}

$rm = new ReflectionMethod(TraitFixtureWithFinalAndProtected::class, 'foo');
var_dump($rm->isFinal());
var_dump($rm->isPrivate());
var_dump($rm->isProtected());
var_dump($rm->isPublic());

Resulted in this output:

bool(false)
bool(true)
bool(false)
bool(false)

But I expected this output instead:

bool(true)
bool(false)
bool(true)
bool(false)

Looks like as final protected is completely ignored, does not change the method but does not throw an error either.

Related to: https://github.com/php/php-src/issues/12854

PHP Version

PHP 8.3

Operating System

No response

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by running the provided PHP 8.3 reproducer and compare the ReflectionMethod flags with the expected output. Trace the trait method aliasing path responsible for as final protected, then add a regression test showing that both modifiers are applied and confirm the reflected visibility and finality.

Written by the indexing model from the issue text.

Assessment

Tech stack
php
Domain
compilers
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Quiet
Clarity
Mostly clear
Newbie friendliness
54/100

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