Note that although PHP's namespaces can be used for functions and constants as well as classes, the auto-loader technique only works for classes.

注意，尽管可以对函数、常量和类使用php名称空间，但是自动装载器技术只适用于类。

youdao

Cassette Loader, Auto Erase, High Image Quality, Fast Duty Cycle.

暗匣装片器，自动清除，高图像质量，快速循环工作。

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