What exactly is the principle of _autoload

__autoload, what the hell is the principle?
It is said that it is automatic loading, is it not that it is loading all files in the sibling directory of write __autoload files? It seems to be the meaning, but look at a lot of information is not clearly written, are vague.

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------Solution--------------------
When you instantiate a class, the __autoload ($classname) method is automatically triggered if the file is not loaded, and the __autoload () method is used to load the class

Method you need to include the address of the file containing this class

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