You can also get a valid code by entering the WeChat webpage, but after sharing it, you cannot get the code. How should I solve this problem?

You can also get a valid code by entering the WeChat webpage, but after sharing it, you cannot get the code. How should I solve this problem?

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You can also get a valid code by entering the WeChat webpage, but after sharing it, you cannot get the code. How should I solve this problem?

I have recently come into contact with WeChat development. The url of your page should be a method in your controller, and the shared url should also be this method. The first thing in this method is to get the code from WeChat, and then jump the url to you. The page that actually needs to be accessed. The implementation method can be to add different parameters after the url to distinguish the different accessed pages.
The code I wrote in laravel deleted some of my business logic. Here’s an overview:

<code><?php
class WeiXinController extends BaseController {
    /**
     * @name OAuth2.0获取openid和用户信息跳转(外部专用,网页授权地址必须写当前代码地址)
     * 该方法的作用是进行微信用户授权，获取微信code，假设此方法的url为：http://mysite.com/oauthtwo
     * 则所有的页面访问均通过该url跳转，可以通过在该url上添加参数的形式来实现
     * 比如：在此url后添加type参数，通过判断type参数值跳转到不同的页面
     * 举例：http://mysite.com/oauthtwo?type=login
     * http://mysite.com/oauthtwo?type=signup
     * http://mysite.com/oauthtwo?type=play
     * http://mysite.com/oauthtwo?type=func1
     * @param string $url
     */
    public function oauthtwo(Request $request) {
        $redirectUrl = 'http://mysite.com/start';
        $redirectUrl = $redirectUrl . '?' . $_SERVER['QUERY_STRING'];// 取出参数并添加到跳转链接
        $redirectUrl = urlencode($redirectUrl);
        // 第一步：用户授权-跳转链接-获取到code
        $url = 'https://open.weixin.qq.com/connect/oauth2/authorize?appid=' . $this->appid . '&redirect_uri=' . $redirectUrl . '&response_type=code&scope=snsapi_userinfo&state=STATE#wechat_redirect';// 微信授权url
        
        return redirect($url);// 跳转到start方法
    }
    
    /**
     * 获取微信用户的openid和access_token，并判断type值跳转页面
     */
    public function start(Request $request) {
        // 第二步：通过code获取到openid和access_token（有效期两小时）
        $code = Input::get('code');
        $type = Input::get('type');
        $openid = Input::get('openid');
        $redirectUrl = 'http://mysite.com';// 设置一个默认跳转链接，后面专门写一个方法判断type值，获取需要跳转的链接
        $result = $this->getAccessToken($code);
        if ($result) {
            // 第三步：获取用户信息
            $result = $this->getUserInfo($result['openid'], $result['access_token']);
            // 第四步：跳转到访问页面链接，将用户openid写到url参数中
            $redirectUrl = $this->getRedirectUrl($type, $openid);//根据type值获取需要跳转的页面
        }
        
        return redirect($redirectUrl);
    }
    
    /**
     * 获取微信access_token
     * @return 成功返回结果，失败返回false
     */
    public function getAccessToken($code) {
        $getAccessTokenUrl = 'https://api.weixin.qq.com/sns/oauth2/access_token?appid=' . $this->appid . '&secret=' . $this->appsecret . '&code=' . $code . '&grant_type=authorization_code';
        $httpapi = new CommonHttpApi();
        $result = $httpapi->call($getAccessTokenUrl);
        
        return $result;
    }

    /**
     * 获取用户信息
     * @param unknown $openid
     * @param unknown $accessToken
     */
    public function getUserInfo($openid, $accessToken) {
        $getUserInfoUrl = 'https://api.weixin.qq.com/sns/userinfo?access_token=' . $accessToken . '&openid=' . $openid . '&lang=zh_CN';
        $httpapi = new CommonHttpApi();
        $result = $httpapi->call($getUserInfoUrl);
        
        return $result;
    }
}</code>