PHP Manual Summary (i)

One: Automatic loading

__autoload ():

Attention:

1:Spl_autoload_register () provides a more flexible way to implement automatic loading of classes. Therefore, it is no longer recommended to use the __autoload() function, which may be deprecated in later versions.

2: Before version 5.3.0, the exception thrown by the __autoload function cannot be caught by a catch statement block and can cause a fatal error. After 5.3.0+, the exception thrown by the __autoload function can be captured by a catch statement block, but a condition needs to be followed. If a custom exception is thrown, the corresponding custom exception class must exist. The __autoload function can automatically load custom exception classes recursively.

3: Automatically load the CLI interaction mode that is not available for PHP.