The method setLocale() does not exist on Illuminate\Container\Container. Are you sure you never get this type here, but always one of the subclasses?
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Ignorable by Annotation
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If this is a false-positive, you can also ignore this issue in your code via the ignore-call annotation
It seems like $request->server('HTTP_ACCEPT_LANGUAGE') can also be of type array and null; however, parameter $string of explode() does only seem to accept string, maybe add an additional type check?
(
Ignorable by Annotation
)
If this is a false-positive, you can also ignore this issue in your code via the ignore-type annotation