opcache_compile_file() fails with Cannot redeclare function error when compiling multiple files with the same function

Description

The following code:

compile-test.php

<?php
var_dump(opcache_compile_file(__DIR__ . '/releases/v1/functions.php'));

// expecting `bool(false)` since opcache_compile_file() shouldn't have executed the compiled file.
var_dump(in_array('foo', get_defined_functions()['user']));

// expecting successful compilation: `bool(true)`
var_dump(opcache_compile_file(__DIR__ . '/releases/v2/functions.php'));

releases/v1/functions.php

<?php
function foo(): string {
    return 'foo_v1';
}

releases/v2/functions.php

<?php
function foo(): string {
    return 'foo_v2';
}

Resulted in this output:

bool(true)
bool(true)
PHP Fatal error:  Cannot redeclare foo() (previously declared in /private/tmp/opcache/releases/v1/functions.php:4) in /private/tmp/opcache/releases/v2/functions.php on line 4

Fatal error: Cannot redeclare foo() (previously declared in /private/tmp/opcache/releases/v1/functions.php:4) in /private/tmp/opcache/releases/v2/functions.php on line 4
PHP Warning:  Zend OPcache could not compile file /private/tmp/opcache/releases/v2/functions.php in /private/tmp/opcache/compile-test.php on line 4

Warning: Zend OPcache could not compile file /private/tmp/opcache/releases/v2/functions.php in /private/tmp/opcache/compile-test.php on line 4
bool(false)

But I expected this output instead:

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

Additional Context:
The issue happens on both cli and php-fpm. It seems to be similar to https://bugs.php.net/bug.php?id=66066 . While the use case in bug 66066 might be less common in the real world and probably should be avoided, it's a perfectly valid use case to run multiple releases with similar files under the same php-fpm instance.

Workaround
Our current workaround is to compile different releases with different requests, i.e. PHP will happily process the following logics in two different requests.

compile-v1.php

<?php
var_dump(opcache_compile_file(__DIR__ . '/releases/v1/functions.php'));

compile-v2.php

<?php
var_dump(opcache_compile_file(__DIR__ . '/releases/v2/functions.php'));

opcache_get_status()['scripts'] shows that the two files have been compiled successfully.

    [/var/www/html/releases/v2/functions.php] => Array
        (
            [full_path] => /var/www/html/releases/v2/functions.php
            [hits] => 0
            [memory_consumption] => 992
            [last_used] => Fri Nov  1 11:32:01 2024
            [last_used_timestamp] => 1730460721
            [timestamp] => 1730458160
            [revalidate] => 1730460723
        )

    [/var/www/html/releases/v1/functions.php] => Array
        (
            [full_path] => /var/www/html/releases/v1/functions.php
            [hits] => 5
            [memory_consumption] => 992
            [last_used] => Fri Nov  1 11:31:58 2024
            [last_used_timestamp] => 1730460718
            [timestamp] => 1730458130
            [revalidate] => 1730460720
        )

PHP Version

PHP 8.3.13

Operating System

No response

まず、PHP 8.3.13 上で opcache_compile_file() を使って issue の compile-test.php リプロデューサーを実行し、その後、個別の compile-v1.php および compile-v2.php リクエストと比較します。opcache_compile_file() のエントリポイントと、重複した関数を含むコンパイル済みファイルの処理を追跡します。完了の条件は、コードを実行したり redeclare エラーを発生させたりせずに、1 回のリクエストで両方のファイルが正常にコンパイルされることです。