DIRECTORY_SEPARATOR can be used in all cases. it is also supported by windows.

Path separator: '& #039 on linux;' & #039 on windows; I use the path separator. on linux, it is '/' on windows '', I used/

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Path separator. in linux, it is '/' in windows. I use/

DIRECTORY_SEPARATOR is a predefined constant of the path separator.
Determine the value based on the system on which your server is deployed, or the system on which your php file runs.
If it is a Linux system, its value is/In Windows, the value is\.
This constant is used to ensure that the path you write can be normally accessed by the system in any system.