Isn't this / ?
Why is there a constant for it? It's not like it can change, right?
DIRECTORY_SEPARATOR is constant with that OS directory separator. Use it every time in paths. In you code snippet we clearly see bad practice code. If framework/cms are widely used it doesn't mean that it's using best practice code. Follow this answer to receive notifications.
If you prefer to hard-code the directory separator character, you should use the forward slash ( / ) character. It is the only recognized directory separator character on Unix systems, as the output from the example shows, and is the AltDirectorySeparatorChar on Windows.
PATH_SEPARATOR is the character used to separate many paths in a unique string (like include_path in php.ini).
Its value is ':' on a UNIX system and ';' on a Windows system.
What you're talking about ('/' on UNIX and '\' on Windows) is the DIRECTORY_SEPARATOR constant.
As your original question states: "Why is there a PATH_SEPARATOR constant?", windows uses a semi-colon ;, while other systems use a colon :
However I think you've mistaken PATH_SEPARATOR with DIRECTORY_SEPARATOR
PATH_SEPARATOR delimits multiple paths in the same string. For example when used in windows environment variables.
c:\path\to\a;c:\path\to\b
DIRECTORY_SEPARATOR separates the directories within the path: In Windows
\ In other systems
/ As mentioned by others, windows also accepts /
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