Sets the encoding for input/output documents. Returns TRUE
on success or FALSE
on failure.
Possible values for encoding are
ascii, latin0, latin1, raw, utf8, iso2022, mac, win1252, ibm858, utf16,
utf16le, utf16be, big5 and shiftjis
Note: This function is only available in
Tidy 1.0. It became obsolete in Tidy 2.0 and thus has been removed.