Why does my test2 show that the class name has been occupied after running it?

Question

错误信息：

Fatal error: Cannot declare class Demo2\mytest1 because the name is already in use in E:\phpstudy\WWW\test\mytest2.php on line 5。

Answer 1

Because this class name has been declared, please check whether the class name already exists in your file, or whether it already exists in other files.