解决了.我没有意识到命名空间别名仅适用于当前文件，而不适用于任何未来包含的文件.在 PHP.net 上发现这也适用于别名:

Solved it. I didn't realize that aliasing a namespace only applies to the current file, and not any future included files. Found this on PHP.net which also applies to aliasing:

导入规则是基于每个文件的，这意味着包含的文件不会继承父文件的导入规则.

Importing rules are per file basis, meaning included files will NOT inherit the parent file's importing rules.