Dynamic string is not callable after check with function_exists

[luxemate]

Summary of a problem or a feature request

If dynamic string is checked with function_exists it still is considered as not callable. While checking it with is_callable works.

Is it a bug or an existing function may somehow not be callable?

Code snippet that reproduces the problem

Trying to invoke string but it might not be a callable.
https://phpstan.org/r/dff90463-0f69-409a-ba59-fb242a09a13e

Expected output

No errors.

[ondrejmirtes]

Yeah, this is not currently supported, you can just use is_callable :)

[phpstan-bot]

@luxemate After the latest commit in dev-master, PHPStan now reports different result with your code snippet:

@@ @@
-12: Trying to invoke string but it might not be a callable.
+12: Trying to invoke non-empty-string but it might not be a callable.

Full report

Line	Error
12	Trying to invoke non-empty-string but it might not be a callable.

[ondrejmirtes]

Implemented: phpstan/phpstan-src@4a98863

[github-actions]

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