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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