微信授权登陆

第一步：用户同意授权，获取code

在确保微信公众账号拥有授权作用域（scope参数）的权限的前提下（服务号获得高级接口后，默认拥有scope参数中的snsapi_base和snsapi_userinfo），引导关注者打开如下页面：

https://open.weixin.qq.com/connect/oauth2/authorize?appid=APPID&redirect_uri=REDIRECT_URI&response_type=code&scope=SCOPE&state=STATE#wechat_redirect

第二步：通过code换取网页授权access_token

https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=SECRET&code=CODE&grant_type=authorization_code 

第三步：刷新access_token（如果需要）

https://api.weixin.qq.com/sns/oauth2/refresh_token?appid=APPID&grant_type=refresh_token&refresh_token=REFRESH_TOKEN 

第四步：拉取用户信息(需scope为 snsapi_userinfo)

https://api.weixin.qq.com/sns/userinfo?access_token=ACCESS_TOKEN&openid=OPENID&lang=zh_CN 

具体代码实现

public function actionGetUserInfo(){
        //第一步：用户同意授权，获取code
        $appid = "wx9c044f";
        $redirect_url = urlencode("http://admin.cheesebeer.net/index.php?r=share/get-user");
        $url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=".$appid."&redirect_uri=".$redirect_url."&response_type=code&scope=snsapi_userinfo&state=".time()."#wechat_redirect";
        header("location:".$url);
    }
public function actionGetUser(){
        $code = $_GET['code'];
        $appid = "wx9c044f981";
        $app_secret = "3fd73bb4cd76af92528e3";
        $url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=".$appid."&secret=".$app_secret."&code=".$code."&grant_type=authorization_code";
        $res = json_decode($this->_http_curl_get($url));

        if(isset($res->access_token)){
            $get_user_url = "https://api.weixin.qq.com/sns/userinfo?access_token=".$res->access_token."&openid=".$res->openid."&lang=zh_CN";
            $user_info = json_decode($this->_http_curl_get($get_user_url));
            $target_url = "http://movietip1.duapp.com/index.html?headimgurl=".$user_info->headimgurl."&nickname=".$user_info->nickname;
            header("location:".$target_url);
        }
    }

注意点

需要在微信后台填写 授权回调页面域名: 即上面的$redirect_url，$redirect_url需要urlencode,才能正常使用

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自定义分享接口

代码采用的是yii2框架作为开发的基础框架

public function actionShare()
    {

        $app_id = Yii::$app->request->get('app_id','wx3639f3e999c3');
        $app_secret = Yii::$app->request->get('app_secret','5e0d10f0f9b8c593e48f5dec');
        $url = Yii::$app->request->get('url','http://marqian.duapp.com/');

        $options = [
            "app_id"=>$app_id,
            "secret"=>$app_secret,
        ];

        $wechat = new Application($options);
        $wechat->js->setUrl($url);

        return ($wechat->js->config(['onMenuShareTimeline','onMenuShareAppMessage'],true));

    }