$url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=".$appId."&redirect_uri=".$redirectUrl."&response_type=code&scope=snsapi_userinfo&state=".$state."#wechat_redirect";

        return $url;

    }

    /****************************************************

     * ΢ÐÅOAUTHÌøתָ¶¨URL

     ****************************************************/

    public function wxHeader($url){

        header("location:".$url);

    }

    /****************************************************

     * ΢ÐÅͨ¹ýOAUTH·µ»ØÒ³ÃæÖлñÈ¡ATÐÅÏ¢

     ****************************************************/

    public function wxOauthAccessToken($code,$appId = NULL , $appSecret = NULL){

        $appId     = is_null($appId) ? self::appId : $appId;

        $appSecret   = is_null($appSecret) ? self::appSecret : $appSecret;

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