Bug report

When using the function get_defined_vars() inside a method of a class, phpstan thinks the array should contain "this", but it does not.

Code snippet that reproduces the problem

https://phpstan.org/r/72384f2b-f867-4b49-b9e0-3d8b3d811546

Expected output

No error expected.

When uncommenting the line with //unset($values["this"]);, phpstan does not give an error anymore. but executing the php code works either way.

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