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Date: Thu, 21 Oct 2021 00:12:08 +0100
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Subject: Add ReflectionFunctionAbstract::isAnonymous()
From: dktapps@pmmp.io ("Dylan K. Taylor")

Hi all, 

Given the addition of Closure::fromCallable() and the upcoming first-class callable syntax in 8.1, it seems slightly problematic that there's no simple way to tell by reflection if a Closure refers to an anonymous function or not. ReflectionFunctionAbstract::isClosure() (perhaps somewhat misleadingly) returns whether the closure is literally a \Closure instance, so it's not useful for this purpose. 

The only way to do this currently (that I know about) is to check if the name of the function contains "{closure}", which is a bit unpleasant and depends on undocumented behaviour. 

I'm proposing the addition of ReflectionFunctionAbstract::isAnonymous(), which would fill this use case, and may be able to offer an implementation. 
 
Thanks, 
Dylan Taylor.