Segmentation fault (zend_mm_heap corrupted) with pipe operator

[adrianszczotkowski]

Description

Step 1:
The following code:

function test(string $string): void
{
    echo $string . PHP_EOL;
}

'abc' |> test(...);

Running with extra debug output :

php -e -n ./test.php

As expected returns:

abc

Step 2:
Add a file const.php

<?php

define('OPQ', false);

And require it in test.php:

require_once __DIR__ . '/const.php';

Run the same command:

php -e -n ./test.php

Returns:

zend_mm_heap corrupted

Step 3:
But add another define in test.php

require_once 'const.php';

define('XYZ', false);

function test(string $string): void
{
    echo $string . PHP_EOL;
}

'abc' |> test(...);

Run the same command:

php -e -n ./test.php

Works fine and returns:

abc

Bonus content:
Try the steps above without -n:

php -e ./test.php

Returns random content eg.:

<�V

PHP Version

PHP 8.5.5 (cli) (built: Apr  9 2026 22:14:17) (ZTS)
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 88a458a84760 6.19.12-1-cachyos #1 SMP PREEMPT_DYNAMIC Sat, 11 Apr 2026 19:24:21 +0000 x86_64 GNU/Linux

[iluuu1994]

Hi @adrianszczotkowski. See GH-21504, this should be fixed in the next release.