84669 person learning
152542 person learning
20005 person learning
5487 person learning
7821 person learning
359900 person learning
3350 person learning
180660 person learning
48569 person learning
18603 person learning
40936 person learning
1549 person learning
1183 person learning
32909 person learning
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。
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.
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
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.