define('DS' , DIRECTORY_SEPARATOR)
What should I do if I don’t understand it at all?
菜鸟新人，多多关照
This is just a definition of constants, what do you need to know? Take a look at PHP basic variable types
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
This is just a definition of constants, what do you need to know? Take a look at PHP basic variable types