通过第三方平台帮助公众号生成带参数的二维码

第三方平台接口文档：https://open.weixin.qq.com/cgi-bin/showdocument?action=dir_list & t=resource/res_list & verify=1 & id=open1453779503 & token= & lang=zh_CN

公众号接口文档：https://mp.weixin.qq.com/wiki?t=resource/res_main & id=mp1443433542

关键步骤是通过第三方平台获取access_token

下面是部分代码及步骤

1,

//获取微信第三方平台component_access_token

if(!function_exists('getComponentAccessToken')){
    function getComponentAccessToken(){
        $cachePath = './cache/componentAccessToken';
        $data = json_decode(file_get_contents($cachePath),true);
        if($data['expire_time'] < time()){
            $url = 'https://api.weixin.qq.com/cgi-bin/component/api_component_token';
            $post = json_encode(array(
                'component_appid'           => WEIXIN_OPEN_APPID,
                'component_appsecret'       => WEIXIN_OPEN_APPSECRET,
                'component_verify_ticket'   => getComponentVerifyTicket(),
            ));
            $res = json_decode(httpPost($url,$post),true);
            if($res['component_access_token']){
                $data['component_access_token'] = $res['component_access_token'];
                $data['expire_time'] = time() + 7000;
                file_put_contents($cachePath,json_encode($data));
            }
        }
        return $data['component_access_token'];
    }
}

//刷新令牌
if(!function_exists('refreshToken')){
    function refreshToken($appid,$token){
        $url = 'https://api.weixin.qq.com/cgi-bin/component/api_authorizer_token?component_access_token='.getComponentAccessToken();
        $post = json_encode(array(
            'component_appid'   => WEIXIN_OPEN_APPID,
            'authorizer_appid'  => $appid,
            'authorizer_refresh_token'  => $token,
        ));
        $res = json_decode(httpPost($url,$post),true);
        return $res;
    }
}

3,

    $res = $this->db->query('SELECT accesstoken,expires,refreshtoken FROM ******* WHERE appid = "' . $this->appid . '" LIMIT 1')->row_array();
    if($res['refreshtoken']) {
        if ($res['expires'] < time()) {
            $res = refreshToken($this->appid, $res['refreshtoken']);
            if ($res['authorizer_access_token']) {
                $res['accesstoken'] = $res['authorizer_access_token'];
                $this->ci->db->update('sp_weixin_number', array(
                    'accesstoken' => $res['authorizer_access_token'],
                    'expires' => time() + 7000,
                ), array(
                    'appid' => $this->appid,
                ));
            }
        }
        return $res['accesstoken'];

4,

    $token = $this->api->token();
    $url = 'https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token='.$token;
    $post = '{"expire_seconds": 7200, "action_name": "QR_SCENE", "action_info": {"scene": {"scene_id": "'.$_id.'"}}}';
    echo httpPost($url, $post);