[theme-reviewers] File operations in themes, which PHP functions are/will stay allowed?

[Lmm Muc]

Looks like file_get_contents is not permitted anymore. What about fopen
etc.? Looks like they still can be used?

What can and cannot be used regarding opening, closing, writing to files?

I plan to write dynamic CSS to a file (ending on .css) located in the theme
folder

Greetings,
Flynn
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