Bug report

When using openssl_sign, signature variable is reported as mixed when it should be reported as string. As a result rector tool is adding (string) cast for base64_encode($var) when used. Then after rector psalm complains about unnecessary cast to string.

By following docs on openssl_sign

signature

    If the call was successful the signature is returned in signature.

So type should not be changed from string to mixed after openssl_sign() is used.

Code snippet that reproduces the problem

https://phpstan.org/r/5567ebe6-946a-4f5d-a0e0-871133d0cb33

Expected output

Dumped type: string

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