They provide further clarification if the high-level namespace isn't enough to establish context for the PHP class you're creating.

当顶级名称空间还不足以为php类建立上下文时，它们提供进一步说明。

youdao

They provide further clarification if the high-level namespace isn't enough to establish context for the PHP class you're creating.

当顶级名称空间还不足以为php类建立上下文时，它们提供进一步说明。

youdao