Infinite recursion in property hook getter in opcache preloaded trait

[dreistromlandMf]

Description

The following code:

<?php

trait a {
    public ?string $a = 'a' {
        get => $this->a;
    }
}

class b {
    use a;
}

$b = new b();
echo $b->a;

Resulted in this output when required inside of the file configured under php.ini opcache.preload:

Fatal error: Uncaught Error: Maximum call stack size of 8339456 bytes (zend.max_allowed_stack_size - zend.reserved_stack_size) reached. Infinite recursion? in /var/www/html/index.php:5
Stack trace:
#0 /var/www/html/index.php(5): b->$a::get()
#1 /var/www/html/index.php(5): b->$a::get()
#2 /var/www/html/index.php(5): b->$a::get()
#3 /var/www/html/index.php(5): b->$a::get()
[…]
#10192 /var/www/html/index.php(14): b->$a::get()
#10193 {main}
  thrown in /var/www/html/index.php on line 5

But I expected this output instead:

a

I uploaded a full repo with what I believe to be the minimal reproduction case into https://github.com/dreistromlandMf/php-trait-property-hook-getter-opcache-preload. I could reproduce this with current PHP 8.4 as well. It doesn’t seem to reproduce using the CLI, but booth mod-apache and frankenphp do reproduce this behaviour.

This does look similar to #15240, which was marked fixed in 2024.

PHP Version

PHP 8.5.5 (cli) (built: Apr  9 2026 22:14:03) (NTS)
Copyright (c) The PHP Group
Built by https://github.com/docker-library/php
Zend Engine v4.5.5, Copyright (c) Zend Technologies
    with Zend OPcache v8.5.5, Copyright (c), by Zend Technologies

Operating System

Linux 77052feff1e4 6.19.10-hardened1-1-hardened #1 SMP PREEMPT_DYNAMIC Sat, 28 Mar 2026 00:27:17 +0000 x86_64 GNU/Linux