Bug description

Error messages involving wrong types for base64_decode() started reporting different parameter names sometime between 1.10.16 and 1.10.18.

We can see from php --rf base64_decode that the parameter name should be $string:

$ php --rf base64_decode
Function [ <internal:standard> function base64_decode ] {

  - Parameters [2] {
    Parameter #0 [ <required> string $string ]
    Parameter #1 [ <optional> bool $strict = false ]
  }
  - Return [ string|false ]
}

But the error message claims the parameter is called $str.

Code snippet that reproduces the problem

https://phpstan.org/r/7dba8189-f75d-46cd-a6ac-9a6d685e5f9c

Expected output

Parameter #1 $string of function base64_decode expects string, int given.

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