PHP自动识别字符集并完成转码详解_PHP教程

        if ((ord($string{$i}) & 224) == 224) {
            //第一个字节判断通过
            $char = $string{++$i};
            if ((ord($char) & 128) == 128) {
                //第二个字节判断通过
                $char = $string{++$i};
                if ((ord($char) & 128) == 128) {
                    $encoding = "UTF-8";
                    break;
                }
            }
        }
        if ((ord($string{$i}) & 192) == 192) {
            //第一个字节判断通过
            $char = $string{++$i};
            if ((ord($char) & 128) == 128) {
                //第二个字节判断通过
                $encoding = "GB2312";
                break;
            }
        }
    }

    if (strtoupper($encoding) == strtoupper($outEncoding))
        return $string;
    else
        returniconv($encoding, $outEncoding, $string);
}