What is the recommended method of copying data between two opened files?

A.
copy($source_file, $destination_file);
B.
copy($destination_file, $source_file);
C.
stream_copy_to_stream($source_file, $destination_file);
D.
stream_copy_to_stream($destination_file, $source_file);
E.
stream_bucket_prepend($source_file, $destination_file);
Why use stream methods?
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hijo de pene
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