Why is the refcount of the phpstatic variable 2 and is_ref 1? -Php Tutorial

{Code...} why is the output after execution a :( refcount1, is_ref0) 1b :( refcount2, is_ref1) 1static variable and common variable so different?

Why is output after execution
A: (refcount = 1, is_ref = 0) = 1
B: (refcount = 2, is_ref = 1) = 1
Why is the difference between static variables and common variables?

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Why is output after execution
A: (refcount = 1, is_ref = 0) = 1
B: (refcount = 2, is_ref = 1) = 1
Why is the difference between static variables and common variables?

Refcount indicates the count. if it is 0, it is destroyed.
If Unset is used, the value is reduced by 1.
Is_ref indicates reference
Conjecture: the content in this table variable is another memory address (that is, the actual content). then unset will only delete this variable and will not delete the content in this memory address.
Http://php.net/manual/zh/features.gc.refcounting-basics.php