type-inference

The stub for preg_replace_callback() is:

https://github.com/vimeo/psalm/blob/36d5a2a83c1d7b3e2aca1cfe9e9dcc916619e962/stubs/CoreGenericFunctions.phpstub#L922-L932

With @param callable(string[]):string $callback. However if you pass the PREG_UNMATCHED_AS_NULL flag the signature will become @param callable((string|null)[]):string $callback.

I have a $m[1] === null check in my call

See https://github.com/doctrine/dbal/blob/3.3.x/UPGRADE.md#deprecated-fetchmode-and-the-corresponding-methods

for newer 2.x releases some api is the same to 3.x.

its only about the low hanging fruit. I guess we mostly need to check places like
https://github.com/staabm/phpstan-dba/blob/4d1c84b2dd4241ab9aee1f8e111a84e9d1df6313/src/Extensions/DoctrineConnectionExecuteQueryDynamicReturnTypeExt