I have a general question about referencing...

Would it be safe to reference a function return value?
My main concern is that once the function goes out of scope, is that variable cleaned 
up or would it stay around because there is a new reference to it.

I am coming from the C++ and Java world. I know how it works there! However, I am 
unsure about PHP. Instead of trying out a test script. I wish to know more about 
language design. So, I would be assured of its support for future versions of the 

Thank you very much.

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