Pdo:attr_client_version What's the meaning of this double colon?

Pdo::attr_client_version what does this double colon mean?
This post was last edited by Lghyt on 2013-12-06 12:34:45

These two symbols in the PHP class are very dizzy.
Pdo::attr_client_version what does this double colon mean?

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------Solution--------------------
When accessing a member variable or method in a PHP class, if the referenced variable or method is declared as const (defining a constant) or static (declaring static), the operator is used::, and vice versa.
It should be understood that ...
------Solution--------------------
Is there such a description in the manual?
Scope resolution operators (::)

Sometimes it is useful to access functions or variables in a class in cases where no instances are declared. and the:: operator is used for this case.

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