Array keys are not always set

[BackEndTea]

Bug report

When doing an isset before setting a key in an array phpstan will think the key is always set, but only if a 'child' array is set within that

Code snippet that reproduces the problem

https://phpstan.org/r/f66b9fc9-d92f-4a7e-aa1b-34483e6cf92c

Expected output

I'd expect both functions to not have any errors, but the first function has a failure.

[ondrejmirtes]

Thank you. This bug has been haunting me for some time, but I've never seen it formulated in a minimized example.

[phpstan-bot]

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

@@ @@
-10: Strict comparison using === between true and false will always evaluate to false.
+No errors

[github-actions]

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