PHP——字符串统一转码为GBK，自动判断是否UTF8并转码

    public static function strToGBK($strText)

    {

        $encode = mb_detect_encoding($strText, array('UTF-8','GB2312','GBK'));

        if($encode == "UTF-8")

        {

            return @iconv('UTF-8','GB18030',$strText);

        }

        else

        {

            return $strText;

        }

    }

mb_detect_encoding：检测字符的编码

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