php cp936如何转utf8

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mb_convert_encoding($str, 'UTF-8', 'CP936');

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function toUtf8($str) {
    $encode = mb_detect_encoding($str, array('CP936', "ASCII","GB2312","GBK",'UTF-8','BIG5'));
    if ($encode == 'UTF-8') {
        return $str;
    } elseif ($encode == 'CP936') {
        return iconv('utf-8', 'latin1//IGNORE', $str);
    } else {
        return mb_convert_encoding($str, 'UTF-8', $encode);
    }
}