How to implement automatic loading of classes in php

How to implement automatic class loading in php: 1. Use the "__autoload" magic function to load classes; 2. Use the "spl_autoload_register" function to replace the autoload function.

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class means that in the outside page, There is no need to "import" class files, but the program will dynamically load the required class files when needed.

Method 1: Use the __autoload magic function

When the program needs a certain class, it will call this function. This function we You need to define and write the general statements for loading class files yourself.

v1 = 10; echo "
v1：".$o1->v1; ?>

Method 2:Use the spl_autoload_register function

The function of this function is to have more lives A function that can be used to replace the autoload function. The syntax is as follows: spl_autoload_regist("function name 1"); if spl_autoload_register is used, autoload will be invalid.

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