Bug report

PHP 7.4 added support for flags to preg_replace_callback() and preg_replace_callback_array(). It seems, however, that PHPStan doesn't account for the $flags parameter when determining the signature of the callback.

Currently, PHPStan expects the callback signature to be callable(array<int|string, string>): string, which is not true if PREG_OFFSET_CAPTURE or PREG_UNMATCHED_AS_NULL flags are used

Code snippet that reproduces the problem

https://phpstan.org/r/9b24636c-c960-45c8-9ef7-5ee47f34623f

Expected output

There should be no errors

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