I need to write (among others data) from form method with fputs rows in file with latinic and cyrilic letters in same row, for example (utf8 of course)

THIS IS SAMPLE ŠĐČĆĆ ШЂЧЋЖ

I tried but in file occurs ???? for cyrilic letters and some strange letters in output file.

Can you help me with this problem?
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do as Dragan told you, you won't have any problems ;)