fputcsv() formats a line (passed as a
fields array) as CSV and write it to the
handle. Returns the length of the
written string, or FALSE on failure.
delimiter parameter sets the field
delimiter (one character only). Defaults as a comma: ,.
enclosure parameter sets the field
enclosure (one character only) and defaults to a double quotation mark:
Note: If you are having problems with PHP not recognizing the line endings when reading files either on or created by a Macintosh computer, you might want to enable the auto_detect_line_endings run-time configuration option.
See also fgetcsv().