(PECL tidy >= 0.5.2)
tidy_set_encoding — Set the input/output character encoding for parsing markup
bool tidy_set_encoding ( string $encoding )
Sets the encoding for input/output documents.
encoding
The encoding parameter sets the encoding for input/output documents. The possible values for encoding are: ascii, latin0, latin1, raw, utf8, iso2022, mac, win1252, ibm858, utf16, utf16le, utf16be, big5, and shiftjis.
Returns TRUE on success or FALSE on failure.
Note: This function is only available in Tidy 1.0. It became obsolete in Tidy 2.0, and thus has been removed.
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https://secure.php.net/manual/en/function.tidy-set-encoding.php