Description:
------------
When a function is defined inside an if/else block it will produce a `Cannot redeclare` error when the function is loaded in `opcache.preload`.

removing the if statement solves the error.

The documentation states: https://www.php.net/manual/en/opcache.preloading.php:

> include will execute code in the file, while opcache_compile_file() will not. That means only the former supports conditional declaration (functions declared inside an if-block).

Test script:
---------------
<?php #function.php

if (false) {
    function myFunction() {}
} else {
    function myFunction() {}
}

<?php #preload.php

include __DIR__ . "/function.php";

<?php #index.php

require __DIR__ . "/function.php";


Running this in the dev server will produce the error:

php -d opcache.preload=preload.php -S localhost:8080

Actual result:
--------------
Fatal error:  Cannot redeclare myFunction() (previously declared in /app/function.php:6) in /app/function.php on line 6