References to namespaces in PHP

(1) Know the concepts of several terms in a namespace before you introduce references.

1) Fully qualified name

Any PHP code can reference a fully qualified name, which is an identifier at the beginning of a namespace backslash, such as:

\c\root\sub1,\c\root\sub1\returnfunctionname () and so on.

2) qualified name

There is at least one identifier for the namespace delimiter, such as Sub1\returnclassname.

3) Unqualified Name

Identifiers without namespace delimiters, such as returnfuctionname ();

(2) using use to refer to namespaces

Here's what's in the Root\sub1 namespace:

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