Bug report

PHPStan doesn't seem to be obeying the functionMap for some rar extension functions. According to the PHP docs, this function is available with the rar extension:

https://www.php.net/manual/en/rararchive.open.php

And the signature is defined in PHPStan's functionMap file:

https://github.com/phpstan/phpstan-src/blob/master/resources/functionMap.php#L9085

But PHPStan is still throwing an error for code that uses this function (see below).

Code snippet that reproduces the problem

https://phpstan.org/r/604a3d84-0b54-42a0-882d-0d36b2f48e0b

Expected output

rar_open should be found, right?