Declaring sub-namespaces
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    Declaring sub-namespaces

    (PHP 5 >= 5.3.0, PHP 7, PHP 8)

    Much like directories and files, PHP namespaces also contain the ability to specify a hierarchy of namespace names. Thus, a namespace name can be defined with sub-levels:

    Example #1 Declaring a single namespace with hierarchy

    <?phpnamespace MyProject\Sub\Level;const CONNECT_OK = 1;class Connection { /* ... */ }function connect() { /* ... */  }?>
    The above example creates constant MyProject\Sub\Level\CONNECT_OK, class MyProject\Sub\Level\Connection and function MyProject\Sub\Level\connect.